THE COMPARISON / A CLOSER LOOK

Opik by Comet vs Braintrust

Compare the listed plans, useful capabilities, and practical tradeoffs.

Prices and features reflect editorial records. Check vendor terms before you buy; documentary checks do not imply hands-on testing.

Opik by Comet

🔴Developer

LLM Observability & Evals

Open-source LLM evaluation and observability framework: trace, evaluate, monitor, and improve LLM applications.

SOURCE-CHECK COVERAGE

No scoped source-check record shown. Check current pricing and vendor terms before buying.

Starting Price

Free
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Braintrust

🔴Developer

AI Evaluation

Braintrust review 2026: unified evals, prompt workbench, observability, and AI proxy used by OpenAI, Stripe, Notion — features, pricing, pros, cons.

SOURCE-CHECK COVERAGE

No scoped source-check record shown. Check current pricing and vendor terms before buying.

Starting Price

Free
Full ReviewVisit Site

Feature Comparison

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FeatureOpik by CometBraintrust
CategoryLLM Observability & EvalsAI Evaluation
Pricing Plans4 listed plans3 listed plans
Starting PriceFreeFree
Key Features
  • • Trace & Span Logging: Capture and inspect the steps involved in an LLM application request so teams can understand how prompts, model calls, and application logic contribute to outputs.
  • • LLM Application Improvement: Use trace, evaluation, monitoring, and prompt-related workflows together to support iterative improvement of LLM-backed features.
  • • Open-Source Reviewability: The supplied metadata identifies Opik as open source with an Apache-2 tag, which can help teams inspect, extend, or evaluate the tool before committing to a hosted workflow.
  • • Workflow Runtime
  • • Tool and API Connectivity
  • • State and Context Handling

Opik by Comet - Pros & Cons

Pros

  • ✓True Apache 2.0 open source with a self-hostable backend — no source-available rug pull risk
  • ✓SDKs for Python, TypeScript, and Ruby (Ruby support is uncommon among competitors)
  • ✓Wide framework coverage: LangChain, LlamaIndex, LiteLLM, CrewAI, AutoGen, DSPy
  • ✓Free hosted cloud is genuinely usable for individuals and small teams
  • ✓Backed by Comet's mature ML observability lineage, not a brand-new startup

Cons

  • ✗Self-hosting Opik requires real DevOps work — not a Docker-and-forget situation at scale
  • ✗Some evaluators are still maturing compared to specialist eval tools like Braintrust
  • ✗Team-tier pricing is gated behind sales contact
  • ✗Ecosystem is smaller than LangSmith for LangChain-specific workflows

Braintrust - Pros & Cons

Pros

  • ✓Genuinely consolidates four toolchains into one — fewer vendors, one UI, one bill (above the proxy line)
  • ✓Eval review UI is best-in-class for diffing prompt and model changes against curated datasets
  • ✓Adoption by top AI engineering orgs (OpenAI, Stripe) signals it scales past hobbyist use

Cons

  • ✗Pro plan starts at ~$249/month — expensive for indie devs vs. open-source [/tools/langfuse](/tools/langfuse)
  • ✗Opinionated SDK and UI; doesn't fit teams already deep in LangChain's [/tools/langsmith](/tools/langsmith) ecosystem
  • ✗Proxy adds another hop and a vendor dependency in the hot path — measure latency before flipping production traffic

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🔒 Security & Compliance Comparison

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Security FeatureOpik by CometBraintrust
SOC2—✅ Yes
GDPR—✅ Yes
HIPAA—✅ Yes
SSO—✅ Yes
Self-Hosted—❌ No
On-Prem—❌ No
RBAC—✅ Yes
Audit Log——
Open Source—❌ No
API Key Auth—✅ Yes
Encryption at Rest——
Encryption in Transit——
Data Residency——
Data Retention—configurable
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Review Opik by CometReview Braintrust