{"id":18890,"date":"2026-01-08T20:23:20","date_gmt":"2026-01-08T20:23:20","guid":{"rendered":"https:\/\/www.comet.com\/site\/?page_id=18890"},"modified":"2026-09-03T16:38:43","modified_gmt":"2026-09-03T16:38:43","slug":"braintrust-vs-opik","status":"publish","type":"page","link":"https:\/\/www.comet.com\/site\/products\/opik\/compare\/braintrust-vs-opik\/","title":{"rendered":"Braintrust vs. Opik"},"content":{"rendered":"\n<div class=\"wp-block-group alignwide is-layout-constrained wp-block-group-is-layout-constrained\">\n<div class=\"wp-block-group alignwide is-layout-constrained wp-block-group-is-layout-constrained\" style=\"margin-top:var(--wp--preset--spacing--100);margin-bottom:var(--wp--preset--spacing--50)\">\n<h1 class=\"wp-block-heading has-text-align-left alignwide\" style=\"margin-top:var(--wp--preset--spacing--50);margin-bottom:var(--wp--preset--spacing--50)\"><strong><strong>How Do Opik and Braintrust Compare for LLM Observability and Evaluation?<\/strong><\/strong><\/h1>\n\n\n\n<p class=\"alignwide wp-block-paragraph\"><em>Last updated: 2026-08-2<\/em>4<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large is-resized\" style=\"margin-top:var(--wp--preset--spacing--100);margin-bottom:var(--wp--preset--spacing--100)\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"273\" src=\"https:\/\/www.comet.com\/site\/wp-content\/uploads\/2026\/01\/opik-vs-braintrust-1024x273.png\" alt=\"braintrust vs opik logos comparing llm observability and evaluation platforms\" class=\"wp-image-18892\" style=\"width:562px;height:auto\" srcset=\"https:\/\/www.comet.com\/site\/wp-content\/uploads\/2026\/01\/opik-vs-braintrust-1024x273.png 1024w, https:\/\/www.comet.com\/site\/wp-content\/uploads\/2026\/01\/opik-vs-braintrust-300x80.png 300w, https:\/\/www.comet.com\/site\/wp-content\/uploads\/2026\/01\/opik-vs-braintrust-768x205.png 768w, https:\/\/www.comet.com\/site\/wp-content\/uploads\/2026\/01\/opik-vs-braintrust-1536x410.png 1536w, https:\/\/www.comet.com\/site\/wp-content\/uploads\/2026\/01\/opik-vs-braintrust-2048x547.png 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<div class=\"wp-block-group has-border-color has-custom-decorative-border-dark-border-color has-tertiary-background-color has-background is-layout-constrained wp-block-group-is-layout-constrained\" style=\"border-width:1px;border-top-left-radius:8px;border-top-right-radius:8px;border-bottom-left-radius:8px;border-bottom-right-radius:8px;margin-top:var(--wp--preset--spacing--100);margin-bottom:var(--wp--preset--spacing--100);background-image:var(--wp--preset--gradient--custom-dark-background);\">\n<div class=\"wp-block-group is-nowrap is-layout-flex wp-container-core-group-is-layout-9b541e26 wp-block-group-is-layout-flex\" style=\"border-left-color:var(--wp--preset--color--background);border-left-width:3px;padding-left:var(--wp--preset--spacing--24)\">\n<p class=\"alignwide has-background-color has-text-color has-link-color has-body-m-font-size wp-elements-1 wp-block-paragraph\">\u2728 <strong>The short answer<\/strong>: Opik is an open-source LLM observability and agent evaluation platform built by Comet. Braintrust is a proprietary evaluation and observability platform with a strong UI and broad enterprise adoption. Both handle tracing, evaluation, and production monitoring, but they make different trade-offs on openness, agent optimization, and where the product puts its weight.<\/p>\n<\/div>\n<\/div>\n\n\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-group alignfull has-custom-alt-background-dark-background-color has-background is-layout-constrained wp-container-core-group-is-layout-e5a791a7 wp-block-group-is-layout-constrained\" style=\"border-top-color:var(--wp--preset--color--custom-decorative-border-dark);border-top-width:1px;border-bottom-color:var(--wp--preset--color--custom-decorative-border-dark);border-bottom-width:1px;margin-top:var(--wp--preset--spacing--100);margin-bottom:var(--wp--preset--spacing--100);padding-top:var(--wp--preset--spacing--100);padding-bottom:var(--wp--preset--spacing--100)\">\n<div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\">\n<h2 class=\"wp-block-heading has-text-align-left has-display-s-font-size\"><strong>What Are the Best Alternatives to Braintrust in 2026?<\/strong><\/h2>\n\n\n\n<p class=\"has-text-align-left wp-block-paragraph\">If you&#8217;re evaluating Braintrust, the platforms that come up most often in the same conversation are Opik, LangSmith, Langfuse, Arize, and Galileo. Each takes a different angle:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Opik (open-source, Apache-2.0, full self-host), strongest on agent optimization, Test Suites, and end-to-end coverage from prototype to production<\/li>\n\n\n\n<li>LangSmith, tightly integrated with the LangChain ecosystem; good for teams already on that stack<\/li>\n\n\n\n<li>Langfuse, open-source, lighter-weight, popular for teams that want self-hosted tracing without the full platform<\/li>\n\n\n\n<li>Arize, enterprise-focused, strong on ML monitoring and drift detection alongside LLM observability<\/li>\n\n\n\n<li>Galileo, evaluation-first, with a focus on hallucination detection and data quality<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">If your requirement is running entirely inside your own infrastructure without an enterprise agreement, the shortlist starts with Opik and Langfuse. We keep comparisons against each of these tools if you want the head-to-head detail.<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\">\n<h2 class=\"wp-block-heading has-text-align-left has-display-s-font-size\"><strong>What Is the Core Difference Between Opik and Braintrust?<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Opik covers the full agent development lifecycle, from early prototyping through production monitoring and automated optimization. Braintrust is strongest at the evaluation and human-feedback layer, with a polished UI that non-technical collaborators can use without friction.<br><br>The sharpest practical difference: Opik includes all core observability and evaluation features in the open-source tier, while also shipping six named automated optimization algorithms under the Agent Optimizer. Braintrust is fully proprietary, with no open-source offering, and its AI-assisted Loop agent operates differently from Opik&#8217;s automated prompt search against a fitness function.<\/p>\n<\/div>\n\n\n<\/div>\n\n\n\n<div class=\"wp-block-group alignfull is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group is-layout-constrained wp-block-group-is-layout-constrained\">\n<h2 class=\"wp-block-heading has-text-align-center\"><strong>Feature Comparison: Opik vs. Braintrust<\/strong><\/h2>\n<\/div>\n\n\n\n<figure class=\"wp-block-table alignwide feature-table is-style-stripes unstyled-links\"><table class=\"has-background-color has-text-color has-link-color has-fixed-layout\" style=\"border-style:none;border-width:0px\"><thead><tr><th class=\"has-text-align-left\" data-align=\"left\">Feature<\/th><th class=\"has-text-align-left\" data-align=\"left\">Opik (by Comet)<\/th><th class=\"has-text-align-left\" data-align=\"left\">Braintrust<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-left\" data-align=\"left\">License<\/td><td class=\"has-text-align-left\" data-align=\"left\">Open source, Apache-2.0<\/td><td class=\"has-text-align-left\" data-align=\"left\">Proprietary<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">Self-hosting<\/td><td class=\"has-text-align-left\" data-align=\"left\"><strong>Free, full observability &amp; evals feature set<\/strong><\/td><td class=\"has-text-align-left\" data-align=\"left\"><strong>Hybrid deployment available (enterprise)<\/strong><\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">Tracing (traces and spans)<\/td><td class=\"has-text-align-left\" data-align=\"left\"><img decoding=\"async\" src=\"https:\/\/dev-comet-marketing-site.pantheonsite.io\/wp-content\/uploads\/2025\/08\/check-in-circle.svg\" alt=\"checkmark\">Yes, full trace trees, agent graphs, multi-turn conversation logging, multimodal tracing, automatic cost and latency tracking<\/td><td class=\"has-text-align-left\" data-align=\"left\"><img decoding=\"async\" src=\"https:\/\/dev-comet-marketing-site.pantheonsite.io\/wp-content\/uploads\/2025\/08\/check-in-circle.svg\" alt=\"checkmark\">Yes, scalable trace ingestion, live monitoring<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">LLM-as-a-judge evaluation metrics<\/td><td class=\"has-text-align-left\" data-align=\"left\"><img decoding=\"async\" src=\"https:\/\/dev-comet-marketing-site.pantheonsite.io\/wp-content\/uploads\/2025\/08\/check-in-circle.svg\" alt=\"checkmark\">Yes, <a href=\"https:\/\/www.comet.com\/docs\/opik\/latest\/evaluation\/metrics\/overview#llm-as-a-judge-metrics\">22 metrics<\/a> including Hallucination, Moderation, AnswerRelevance, ContextRecall, ContextPrecision, and more<\/td><td class=\"has-text-align-left\" data-align=\"left\"><img decoding=\"async\" src=\"https:\/\/dev-comet-marketing-site.pantheonsite.io\/wp-content\/uploads\/2025\/08\/check-in-circle.svg\" alt=\"checkmark\">Yes, configurable LLM judges<br><\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">Test Suites<\/td><td class=\"has-text-align-left\" data-align=\"left\"><img decoding=\"async\" src=\"https:\/\/dev-comet-marketing-site.pantheonsite.io\/wp-content\/uploads\/2025\/08\/check-in-circle.svg\" alt=\"checkmark\">Yes, natural-language assertions, automates evaluation to run like a unit test<\/td><td class=\"has-text-align-left\" data-align=\"left\">Not documented<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">Heuristic \/ code scorers<\/td><td class=\"has-text-align-left\" data-align=\"left\"><img decoding=\"async\" src=\"https:\/\/dev-comet-marketing-site.pantheonsite.io\/wp-content\/uploads\/2025\/08\/check-in-circle.svg\" alt=\"checkmark\">Yes, 20+ metrics including BERTscore, isJSON, RegexMatch, and more<\/td><td class=\"has-text-align-left\" data-align=\"left\"><img decoding=\"async\" src=\"https:\/\/dev-comet-marketing-site.pantheonsite.io\/wp-content\/uploads\/2025\/08\/check-in-circle.svg\" alt=\"checkmark\">Yes, Autoevals library<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">Human annotation<\/td><td class=\"has-text-align-left\" data-align=\"left\"><img decoding=\"async\" src=\"https:\/\/dev-comet-marketing-site.pantheonsite.io\/wp-content\/uploads\/2025\/08\/check-in-circle.svg\" alt=\"checkmark\">Yes, Annotation Queues with claim\/lock<\/td><td class=\"has-text-align-left\" data-align=\"left\"><img decoding=\"async\" src=\"https:\/\/dev-comet-marketing-site.pantheonsite.io\/wp-content\/uploads\/2025\/08\/check-in-circle.svg\" alt=\"checkmark\">Yes, structured review queues, praised for UX<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">Agent Optimizer<\/td><td class=\"has-text-align-left\" data-align=\"left\"><img decoding=\"async\" src=\"https:\/\/dev-comet-marketing-site.pantheonsite.io\/wp-content\/uploads\/2025\/08\/check-in-circle.svg\" alt=\"checkmark\">Yes, &nbsp;<a href=\"https:\/\/www.comet.com\/docs\/opik\/latest\/development\/optimization-runs\/algorithms\/overview#selection-matrix\">six algorithms<\/a> under one API via the Agent Optimizer (GEPA, Evolutionary, Few-Shot Bayesian, MetaPrompt, HRPO, Parameter Optimization)<\/td><td class=\"has-text-align-left\" data-align=\"left\">Loop agent (AI-assisted prompt and scorer generation)<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">CI\/CD quality gates<\/td><td class=\"has-text-align-left\" data-align=\"left\"><img decoding=\"async\" src=\"https:\/\/dev-comet-marketing-site.pantheonsite.io\/wp-content\/uploads\/2025\/08\/check-in-circle.svg\" alt=\"checkmark\">Yes<\/td><td class=\"has-text-align-left\" data-align=\"left\"><img decoding=\"async\" src=\"https:\/\/dev-comet-marketing-site.pantheonsite.io\/wp-content\/uploads\/2025\/08\/check-in-circle.svg\" alt=\"checkmark\">Yes, GitHub Actions integration<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">Datasets<\/td><td class=\"has-text-align-left\" data-align=\"left\"><img decoding=\"async\" src=\"https:\/\/dev-comet-marketing-site.pantheonsite.io\/wp-content\/uploads\/2025\/08\/check-in-circle.svg\" alt=\"checkmark\">Yes, versioned, built from production traces<\/td><td class=\"has-text-align-left\" data-align=\"left\"><img decoding=\"async\" src=\"https:\/\/dev-comet-marketing-site.pantheonsite.io\/wp-content\/uploads\/2025\/08\/check-in-circle.svg\" alt=\"checkmark\">Yes, versioned, trace-to-data<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">Prompt management<\/td><td class=\"has-text-align-left\" data-align=\"left\"><img decoding=\"async\" src=\"https:\/\/dev-comet-marketing-site.pantheonsite.io\/wp-content\/uploads\/2025\/08\/check-in-circle.svg\" alt=\"checkmark\">Yes, Agent Configurations, versioned<\/td><td class=\"has-text-align-left\" data-align=\"left\"><img decoding=\"async\" src=\"https:\/\/dev-comet-marketing-site.pantheonsite.io\/wp-content\/uploads\/2025\/08\/check-in-circle.svg\" alt=\"checkmark\">Yes, playground with side-by-side diffs<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">Framework integrations<\/td><td class=\"has-text-align-left\" data-align=\"left\"><img decoding=\"async\" src=\"https:\/\/dev-comet-marketing-site.pantheonsite.io\/wp-content\/uploads\/2025\/08\/check-in-circle.svg\" alt=\"checkmark\">40+<\/td><td class=\"has-text-align-left\" data-align=\"left\">Fewer, exact count not documented<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">SDK languages<\/td><td class=\"has-text-align-left\" data-align=\"left\">Python, TypeScript, and more<\/td><td class=\"has-text-align-left\" data-align=\"left\">Python, TypeScript, Go, Ruby, C#, and more<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">Built-in AI assistant<\/td><td class=\"has-text-align-left\" data-align=\"left\"><img decoding=\"async\" src=\"https:\/\/dev-comet-marketing-site.pantheonsite.io\/wp-content\/uploads\/2025\/08\/check-in-circle.svg\" alt=\"checkmark\">Ollie, diagnoses failures, recommends fixes<\/td><td class=\"has-text-align-left\" data-align=\"left\"><img decoding=\"async\" src=\"https:\/\/dev-comet-marketing-site.pantheonsite.io\/wp-content\/uploads\/2025\/08\/check-in-circle.svg\" alt=\"checkmark\">Loop, generates prompts, scorers, datasets<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">MCP server<\/td><td class=\"has-text-align-left\" data-align=\"left\"><img decoding=\"async\" src=\"https:\/\/dev-comet-marketing-site.pantheonsite.io\/wp-content\/uploads\/2025\/08\/check-in-circle.svg\" alt=\"checkmark\"> Yes<\/td><td class=\"has-text-align-left\" data-align=\"left\"><img decoding=\"async\" src=\"https:\/\/dev-comet-marketing-site.pantheonsite.io\/wp-content\/uploads\/2025\/08\/check-in-circle.svg\" alt=\"checkmark\"> Yes <\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">Multimodal evaluation<\/td><td class=\"has-text-align-left\" data-align=\"left\"><img decoding=\"async\" src=\"https:\/\/dev-comet-marketing-site.pantheonsite.io\/wp-content\/uploads\/2025\/08\/check-in-circle.svg\" alt=\"checkmark\">Yes<\/td><td class=\"has-text-align-left\" data-align=\"left\">Not documented<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">Pricing<\/td><td class=\"has-text-align-left\" data-align=\"left\">Free self-host; free cloud tier available<\/td><td class=\"has-text-align-left\" data-align=\"left\">Free to start; enterprise pricing not publicly listed<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-group alignfull has-custom-alt-background-dark-background-color has-background is-layout-constrained wp-container-core-group-is-layout-e5a791a7 wp-block-group-is-layout-constrained\" style=\"border-top-color:var(--wp--preset--color--custom-decorative-border-dark);border-top-width:1px;border-bottom-color:var(--wp--preset--color--custom-decorative-border-dark);border-bottom-width:1px;margin-top:var(--wp--preset--spacing--100);margin-bottom:var(--wp--preset--spacing--100);padding-top:var(--wp--preset--spacing--100);padding-bottom:var(--wp--preset--spacing--100)\">\n<div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\">\n<h2 class=\"wp-block-heading has-text-align-left has-display-s-font-size\"><strong>Self-Hosting: How Do Opik and Braintrust Differ?<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Opik is Apache-2.0 licensed. You can run the full platform on your own infrastructure, free, with no feature gates and no enterprise license required. Your traces stay on your infrastructure.<br><br>Braintrust offers what it calls hybrid deployment, you run the Brainstore data plane on your own infrastructure while Braintrust manages the control plane. This is an enterprise option, not a free self-host path. Teams that need full data residency without a vendor relationship will find Opik&#8217;s model simpler.<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\">\n<h2 class=\"wp-block-heading has-text-align-left has-display-s-font-size\">Is Opik a Good Open-Source Alternative to Braintrust?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Yes, if open-source matters to your team. Opik&#8217;s core features, observability, Test Suites, production monitoring, evaluation, and Agent Optimizer, are all available in the open-source tier under Apache-2.0. Braintrust has no open-source offering.<br><br>On GitHub, Opik has 21,585 stars. Braintrust does not publish an open-source repository for the platform.<br><br>For teams where data ownership, auditability, or avoiding vendor lock-in is a hard requirement, Opik is the only option in this comparison that satisfies it without an enterprise contract.<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\">\n<h2 class=\"wp-block-heading has-text-align-left has-display-s-font-size\">Evaluation Depth: How Do Opik and Braintrust Compare?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Both platforms support the full evaluation loop: build datasets, define scorers, run experiments, gate deployments.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Where they differ is in how they handle agent-specific testing. Opik&#8217;s Test Suites let you define assertions in natural language and run them like unit tests, no dataset curation required, no long eval prompts to craft. You get a clear pass\/fail with reasons. This is designed for the agent development workflow, where you&#8217;re iterating fast and want regression coverage without the overhead of a formal eval setup.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Braintrust&#8217;s evaluation layer is mature and well-regarded. Side-by-side experiment diffs, a clean scorer library (Autoevals), and human review queues that non-technical reviewers can use without friction. The Loop agent can generate scorers and datasets automatically from a description of what you want to optimize.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Opik also includes six named optimization algorithms under the Agent Optimizer, GEPA, Evolutionary, Few-Shot Bayesian, MetaPrompt, HRPO, and Parameter Optimization, which run automated prompt search against a fitness function. Braintrust&#8217;s Loop is AI-assisted but operates differently: you describe what you want, and Loop generates candidates. The two approaches suit different workflows.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Both platforms support LLM-as-a-Judge scoring, heuristic scorers, and human annotation. Opik adds multimodal evaluation; Braintrust&#8217;s multimodal support is not documented.<\/p>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-group alignfull is-layout-constrained wp-block-group-is-layout-constrained\">\n<div class=\"wp-block-group is-layout-constrained wp-block-group-is-layout-constrained\">\n<h2 class=\"wp-block-heading has-text-align-center\"><strong>Pricing: What Does Each Platform Cost?<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Opik: Free to self-host with no feature limits. A managed cloud tier is available. Enterprise pricing is available for teams that want SLAs, SSO, and support.<br>Braintrust: Free to start with no credit card required. Enterprise pricing is not publicly listed, contact sales for details.<br><br>For teams that want to start free and stay free at scale, Opik&#8217;s self-hosted path has no ceiling. Braintrust&#8217;s free tier is a starting point, not a permanent option for large deployments.<\/p>\n<\/div>\n\n\n<\/div>\n\n\n\n<div class=\"wp-block-group alignfull has-custom-alt-background-dark-background-color has-background is-layout-constrained wp-container-core-group-is-layout-e5a791a7 wp-block-group-is-layout-constrained\" style=\"border-top-color:var(--wp--preset--color--custom-decorative-border-dark);border-top-width:1px;border-bottom-color:var(--wp--preset--color--custom-decorative-border-dark);border-bottom-width:1px;margin-top:var(--wp--preset--spacing--100);margin-bottom:var(--wp--preset--spacing--100);padding-top:var(--wp--preset--spacing--100);padding-bottom:var(--wp--preset--spacing--100)\">\n<div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\">\n<h2 class=\"wp-block-heading has-text-align-left has-display-s-font-size\">Trials and Proof of Concept: What Should You Know Before Committing?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Both platforms offer a free starting point, but the proof-of-concept experience differs.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">With Opik, you can run the full platform locally in under an hour using Docker, with no account required. The <a href=\"https:\/\/www.comet.com\/docs\/opik\/\">Opik quickstart<\/a> walks through logging your first trace and running your first eval. Because the full feature set is available in the open-source tier, a self-hosted trial is a production-representative test, you&#8217;re not evaluating a limited version.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">With Braintrust, the free cloud tier is the trial path. Hybrid deployment (running Brainstore on your own infrastructure) is an enterprise conversation. If your proof of concept requires data residency, that adds a step.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">One thing worth noting: some users who have moved from Braintrust to Opik cite performance issues with Braintrust at large data volumes. This is a pattern worth testing in your own proof of concept rather than taking at face value, run your actual trace volumes, not a synthetic sample.<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-group is-layout-constrained wp-block-group-is-layout-constrained\">\n<h2 class=\"wp-block-heading has-text-align-left has-display-s-font-size\">How do you get started with Opik?<\/h2>\n\n\n\n<p class=\"has-text-align-left wp-block-paragraph\">About five minutes and three steps. Most teams find something they can fix within their agent in the first hour.<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Install the SDK: <code>pip install opik<\/code><\/li>\n\n\n\n<li>Add the <code>@track<\/code> decorator, or enable the integration for your framework.<\/li>\n\n\n\n<li>Open the trace view and read your last 100 production calls.<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">Self-hosting is a single command against the <code>opik.sh<\/code> script, or a Helm chart for Kubernetes. The self-host guide covers both.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The <a href=\"https:\/\/www.comet.com\/docs\/opik\/\">Opik docs<\/a> cover tracing, dataset evaluation, and Test Suites. The platform is free and open source, no credit card, no demo call required.<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\">\n<h2 class=\"wp-block-heading has-text-align-left has-display-s-font-size\"><strong><strong>Where Braintrust Does Better<\/strong><\/strong><\/h2>\n\n\n\n<p class=\"has-text-align-left wp-block-paragraph\"><strong>UI and UX.<\/strong> Users consistently describe Braintrust&#8217;s interface as polished and intuitive. The evaluation workflow in particular, side-by-side diffs, the scorer library, the experiment view, is well-designed. Teams that include non-technical reviewers in their eval process will find Braintrust&#8217;s annotation UX easier to onboard.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Language support.<\/strong> Braintrust ships SDKs for Python, TypeScript, Go, Ruby, C#, and more. If your team writes Go or Ruby, Braintrust has first-party support. Opik&#8217;s SDK coverage is narrower.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Enterprise adoption.<\/strong> Braintrust is in production at Stripe, Notion, Coursera, Graphite, and others. If your procurement process includes reference customers, Braintrust has a longer list of named enterprise logos.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Loop agent.<\/strong> Braintrust&#8217;s Loop is a capable AI assistant for generating prompts, scorers, and datasets. It&#8217;s been in the product longer than Ollie and has more documented use cases.<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\">\n<h2 class=\"wp-block-heading has-text-align-left has-display-s-font-size\"><strong><strong><strong>Which Platform Should You Choose?<\/strong><\/strong><\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Choose Opik if:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Open source or self-hosting is a requirement<\/li>\n\n\n\n<li>You need automated agent optimization, not just AI-assisted suggestions<\/li>\n\n\n\n<li>You want Test Suites, natural-language assertions that run like unit tests<\/li>\n\n\n\n<li>You need greater framework integration flexibility or need multimodal evaluation<\/li>\n\n\n\n<li>You want the full feature set without an enterprise contract<\/li>\n\n\n\n<li>Your team is building and debugging agents, not just evaluating text outputs<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Choose Braintrust if:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>UI polish and ease of use are the deciding factor for your team<\/li>\n\n\n\n<li>You need Go or Ruby SDK support<\/li>\n\n\n\n<li>Your eval workflow involves non-technical reviewers who need a clean annotation interface<\/li>\n\n\n\n<li>You&#8217;re already in the Braintrust ecosystem and the switching cost isn&#8217;t justified<\/li>\n\n\n\n<li>Enterprise reference customers matter to your procurement process<\/li>\n<\/ul>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-group alignwide is-layout-flow wp-block-group-is-layout-flow\">\n<h2 class=\"wp-block-heading has-text-align-center\"><strong><strong><strong>Frequently asked questions<\/strong><\/strong><\/strong><\/h2>\n\n\n\n<div class=\"wp-block-group is-layout-constrained wp-block-group-is-layout-constrained\" style=\"margin-top:var(--wp--preset--spacing--100);margin-bottom:var(--wp--preset--spacing--100)\">\n<div class=\"wp-block-comet-accordion-accordion comet-accordion\" data-allow-multiple=\"true\">\n<details class=\"wp-block-comet-accordion-item comet-accordion__item\" open><summary class=\"comet-accordion__item-summary\"><h3><strong>Is Braintrust open source?<\/strong><\/h3><span class=\"comet-accordion__item-icon\" aria-hidden=\"true\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" fill=\"none\" stroke=\"#191A1C\"><path stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\" d=\"M8 1v14m7-7H1\"><\/path><\/svg><\/span><\/summary><div class=\"comet-accordion__item-content\">\n<p class=\"wp-block-paragraph\">No. Braintrust is fully proprietary. There is no open-source tier or community edition.<\/p>\n<\/div><\/details>\n\n\n\n<details class=\"wp-block-comet-accordion-item comet-accordion__item\" open><summary class=\"comet-accordion__item-summary\"><h3><strong><strong><strong>Can I self-host Opik for free?<\/strong><\/strong><\/strong><\/h3><span class=\"comet-accordion__item-icon\" aria-hidden=\"true\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" fill=\"none\" stroke=\"#191A1C\"><path stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\" d=\"M8 1v14m7-7H1\"><\/path><\/svg><\/span><\/summary><div class=\"comet-accordion__item-content\">\n<p class=\"wp-block-paragraph\">Yes. Opik is Apache-2.0 licensed. The full platform, observability, evaluation, Test Suites, Agent Optimizer, runs on your own infrastructure with no license fee and no feature gates.<\/p>\n<\/div><\/details>\n\n\n\n<details class=\"wp-block-comet-accordion-item comet-accordion__item\" open><summary class=\"comet-accordion__item-summary\"><h3><strong><strong><strong><strong><strong><strong><strong><strong>Does Opik have a built-in AI assistant like Braintrust&#8217;s Loop?<\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/h3><span class=\"comet-accordion__item-icon\" aria-hidden=\"true\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" fill=\"none\" stroke=\"#191A1C\"><path stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\" d=\"M8 1v14m7-7H1\"><\/path><\/svg><\/span><\/summary><div class=\"comet-accordion__item-content\">\n<p class=\"wp-block-paragraph\">Yes. Ollie is Opik&#8217;s built-in diagnostics agent. It lives inside Opik, understands your traces, and sees when tool calls, context retrieval steps, system prompts, and more don&#8217;t perform as expected. Grab Ollie&#8217;s recommended fixes and mark issues Resolved. Braintrust&#8217;s Loop focuses on generating prompts, scorers, and datasets; Ollie focuses on diagnosing failures in your traces.<\/p>\n<\/div><\/details>\n\n\n\n<details class=\"wp-block-comet-accordion-item comet-accordion__item\" open><summary class=\"comet-accordion__item-summary\"><h3><strong><strong><strong><strong><strong><strong><strong><strong><strong><strong><strong><strong>What is Brainstore?<\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/h3><span class=\"comet-accordion__item-icon\" aria-hidden=\"true\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" fill=\"none\" stroke=\"#191A1C\"><path stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\" d=\"M8 1v14m7-7H1\"><\/path><\/svg><\/span><\/summary><div class=\"comet-accordion__item-content\">\n<p class=\"wp-block-paragraph\">Brainstore is Braintrust&#8217;s proprietary database, built specifically for agent trace storage and querying. Braintrust claims it is faster than general-purpose databases for full-text search and span loading at scale.<\/p>\n<\/div><\/details>\n\n\n\n<details class=\"wp-block-comet-accordion-item comet-accordion__item\"><summary class=\"comet-accordion__item-summary\"><h3><strong>Does Opik support CI\/CD quality gates?<\/strong><\/h3><span class=\"comet-accordion__item-icon\" aria-hidden=\"true\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" fill=\"none\" stroke=\"#191A1C\"><path stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\" d=\"M8 1v14m7-7H1\"><\/path><\/svg><\/span><\/summary><div class=\"comet-accordion__item-content\">\n<p class=\"wp-block-paragraph\">Yes. Opik integrates with CI\/CD pipelines so you can block deployments when eval scores drop below a threshold.<\/p>\n<\/div><\/details>\n\n\n\n<details class=\"wp-block-comet-accordion-item comet-accordion__item\"><summary class=\"comet-accordion__item-summary\"><h3><strong><strong>Which platform has more framework integrations?<\/strong><\/strong><\/h3><span class=\"comet-accordion__item-icon\" aria-hidden=\"true\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" fill=\"none\" stroke=\"#191A1C\"><path stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\" d=\"M8 1v14m7-7H1\"><\/path><\/svg><\/span><\/summary><div class=\"comet-accordion__item-content\">\n<p class=\"wp-block-paragraph\">Opik documents 40+ integrations. Braintrust&#8217;s integration count is not documented, the platform describes itself as &#8220;framework agnostic&#8221; and lists major frameworks, but does not publish a numbered count.<\/p>\n<\/div><\/details>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-group has-border-color has-custom-decorative-border-dark-border-color has-background-color has-text-color has-link-color wp-elements-3 is-layout-flow wp-block-group-is-layout-flow has-background\" style=\"border-width:1px;border-top-left-radius:8px;border-top-right-radius:8px;border-bottom-left-radius:8px;border-bottom-right-radius:8px;margin-top:var(--wp--preset--spacing--100);margin-bottom:var(--wp--preset--spacing--100);padding-top:var(--wp--preset--spacing--40);padding-right:var(--wp--preset--spacing--40);padding-bottom:var(--wp--preset--spacing--40);padding-left:var(--wp--preset--spacing--40);background-image:var(--wp--preset--gradient--custom-dark-background);\">\n<h2 class=\"wp-block-heading has-text-align-left\"><strong><strong><strong><strong>Try Opik<\/strong><\/strong><\/strong><\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Opik is free, open source, and takes about five minutes to get running. Start with the <a href=\"https:\/\/www.comet.com\/docs\/opik\/\">quickstart<\/a> or explore the <a href=\"https:\/\/github.com\/comet-ml\/opik\">GitHub repository<\/a>. No credit card. No demo call.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><a href=\"https:\/\/www.comet.com\/signup?from=llm\">Free cloud signup<\/a><\/strong><\/li>\n\n\n\n<li><strong>Self-host:<\/strong> <a href=\"https:\/\/github.com\/comet-ml\/opik\">github.com\/comet-ml\/opik<\/a><\/li>\n\n\n\n<li><strong>Docs:<\/strong> <a href=\"https:\/\/www.comet.com\/docs\/opik\/\">comet.com\/docs\/opik<\/a><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Its annotation and human-feedback tooling is mature and well documented, and it has been in production use longer.<\/p>\n\n\n\n<p class=\"has-text-align-left wp-block-paragraph\">And if you want a fully managed service and have no self-hosting requirement, a single-vendor SaaS with no infrastructure to run is a legitimate preference, not a compromise.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Teams with compliance or deployment requirements can talk to us about Enterprise, but you do not need to in order to run the whole thing.<\/em><\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-group alignwide is-layout-constrained wp-container-core-group-is-layout-f88ee8fa wp-block-group-is-layout-constrained\" style=\"padding-top:var(--wp--preset--spacing--100);padding-bottom:var(--wp--preset--spacing--100)\">\n<div class=\"wp-block-group alignwide testimonial-card has-border-color has-custom-decorative-border-dark-border-color has-secondary-color has-custom-alt-background-dark-background-color has-text-color has-background has-link-color wp-elements-4 is-vertical is-nowrap is-layout-flex wp-container-core-group-is-layout-2af0c81c wp-block-group-is-layout-flex\" style=\"border-width:1px;border-radius:12px\">\n<div class=\"wp-block-group wp-container-content-c795c25f is-vertical is-layout-flex wp-container-core-group-is-layout-cc9b9dd5 wp-block-group-is-layout-flex\">\n<figure class=\"wp-block-image size-full is-resized\"><a href=\"https:\/\/www.comet.com\/site\/customers\/pattern-ai-content-analysis\/\"><img loading=\"lazy\" decoding=\"async\" width=\"180\" height=\"36\" src=\"https:\/\/www.comet.com\/site\/wp-content\/uploads\/2025\/10\/pattern-logo-white.svg\" alt=\"pattern company logo \" class=\"wp-image-18104\" style=\"object-fit:contain;width:140px;height:42px\"\/><\/a><\/figure>\n<\/div>\n\n\n\n<p class=\"has-background-color has-text-color has-link-color has-body-m-font-size wp-elements-5 wp-container-content-9cfa9a5a wp-block-paragraph\">&#8220;Opik being open-source was one of the reasons we chose it. Beyond the peace of mind of knowing we can self-host if we want, the ability to debug and submit product requests when we notice things has been really helpful in making sure the product meets our needs.\u201d<\/p>\n\n\n\n<div class=\"wp-block-group vc-testimonial-block__source is-flex is-vertical is-nowrap is-layout-flex wp-container-core-group-is-layout-3c019351 wp-block-group-is-layout-flex\">\n<figure class=\"wp-block-image size-thumbnail is-resized size-full is-style-rounded flex-shrink-0\"><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/www.comet.com\/site\/wp-content\/uploads\/2025\/02\/Jeremy-Mumford-sq-1-150x150.jpg\" alt=\"Jeremy Mumford\" class=\"wp-image-16525\" style=\"object-fit:cover;width:68px;height:68px\" srcset=\"https:\/\/www.comet.com\/site\/wp-content\/uploads\/2025\/02\/Jeremy-Mumford-sq-1-150x150.jpg 150w, https:\/\/www.comet.com\/site\/wp-content\/uploads\/2025\/02\/Jeremy-Mumford-sq-1-300x300.jpg 300w, https:\/\/www.comet.com\/site\/wp-content\/uploads\/2025\/02\/Jeremy-Mumford-sq-1-768x768.jpg 768w, https:\/\/www.comet.com\/site\/wp-content\/uploads\/2025\/02\/Jeremy-Mumford-sq-1.jpg 1000w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/figure>\n\n\n\n<div class=\"wp-block-group is-vertical is-layout-flex wp-container-core-group-is-layout-d62794ec wp-block-group-is-layout-flex\">\n<p class=\"has-accent-color has-text-color has-link-color wp-elements-6 wp-block-paragraph\" style=\"text-transform:uppercase\"><strong>Jeremy Mumford<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"text-transform:uppercase\"><strong>Lead AI Engineer, <a href=\"https:\/\/www.comet.com\/site\/customers\/pattern-ai-content-analysis\/\">Pattern<\/a><\/strong><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-group alignfull is-layout-constrained wp-block-group-is-layout-constrained\" style=\"margin-top:0;margin-bottom:0;padding-top:var(--wp--preset--spacing--100);padding-bottom:var(--wp--preset--spacing--100)\">\n<div class=\"wp-block-group alignwide has-background-color has-accent-background-color has-text-color has-background has-link-color wp-elements-7 is-layout-constrained wp-container-core-group-is-layout-fb75a317 wp-block-group-is-layout-constrained\" style=\"border-radius:12px;padding-top:var(--wp--preset--spacing--50);padding-right:var(--wp--preset--spacing--50);padding-bottom:var(--wp--preset--spacing--50);padding-left:var(--wp--preset--spacing--50);background-image:url(&apos;https:\/\/www.comet.com\/site\/wp-content\/uploads\/2025\/03\/pattern-4.png&apos;);background-position:50% 50%;background-size:cover;background-attachment:scroll;\">\n<h2 class=\"wp-block-heading has-text-align-center has-background-color has-text-color has-link-color wp-elements-8\" id=\"h-get-started-today-for-free\" style=\"margin-top:var(--wp--preset--spacing--24)\">Ready to Upgrade Your AI Development Workflows?<\/h2>\n\n\n\n<p class=\"has-text-align-center has-body-m-font-size wp-block-paragraph\">Join the growing number of developers who&#8217;ve turned to Opik for superior performance, flexibility, and advanced features when building AI applications.<\/p>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-43139366 wp-block-buttons-is-layout-flex\" style=\"margin-bottom:var(--wp--preset--spacing--24)\">\n<div class=\"wp-block-button\"><a rel=\"\" target=\"\" class=\"wp-block-button__link has-tertiary-background-color has-background wp-element-button\" href=\"https:\/\/www.comet.com\/signup?from=llm\">Create Free Account<\/a><\/div>\n\n\n\n<div class=\"wp-block-button is-style-underline\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/www.comet.com\/site\/about-us\/contact-us\/\">Contact Sales<\/a><\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>How Do Opik and Braintrust Compare for LLM Observability and Evaluation? Last updated: 2026-08-24 \u2728 The short answer: Opik is an open-source LLM observability and agent evaluation platform built by Comet. Braintrust is a proprietary evaluation and observability platform with a strong UI and broad enterprise adoption. Both handle tracing, evaluation, and production monitoring, but [&hellip;]<\/p>\n","protected":false},"author":132,"featured_media":19028,"parent":17633,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"wp-custom-template-pages-dark","meta":{"customer_name":"","customer_description":"","customer_industry":"","customer_technologies":"","customer_logo":"","footnotes":""},"coauthors":[125],"class_list":["post-18890","page","type-page","status-publish","has-post-thumbnail","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.9 (Yoast SEO v25.9) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Opik vs. Braintrust: LLM Evaluation Framework Comparison<\/title>\n<meta name=\"description\" content=\"Discover the detailed feature breakdown between Opik and Braintrust for LLM evaluation &amp; observability requirements.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.comet.com\/site\/products\/opik\/compare\/braintrust-vs-opik\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Braintrust vs. Opik\" \/>\n<meta property=\"og:description\" content=\"Discover the detailed feature breakdown between Opik and Braintrust for LLM evaluation &amp; observability requirements.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.comet.com\/site\/products\/opik\/compare\/braintrust-vs-opik\/\" \/>\n<meta property=\"og:site_name\" content=\"Comet\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/cometdotml\" \/>\n<meta property=\"article:modified_time\" content=\"2026-09-03T16:38:43+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.comet.com\/site\/wp-content\/uploads\/2026\/01\/Braintrust-vs-opik.jpg\" \/>\n\t<meta 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Ranellone"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/www.comet.com\/site\/products\/opik\/compare\/braintrust-vs-opik\/","url":"https:\/\/www.comet.com\/site\/products\/opik\/compare\/braintrust-vs-opik\/","name":"Opik vs. Braintrust: LLM Evaluation Framework Comparison","isPartOf":{"@id":"https:\/\/www.comet.com\/site\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.comet.com\/site\/products\/opik\/compare\/braintrust-vs-opik\/#primaryimage"},"image":{"@id":"https:\/\/www.comet.com\/site\/products\/opik\/compare\/braintrust-vs-opik\/#primaryimage"},"thumbnailUrl":"https:\/\/www.comet.com\/site\/wp-content\/uploads\/2026\/01\/Braintrust-vs-opik.jpg","datePublished":"2026-01-08T20:23:20+00:00","dateModified":"2026-09-03T16:38:43+00:00","description":"Discover the detailed feature breakdown between Opik and Braintrust for LLM evaluation & observability 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