Braintrust
Free tierThe AI observability platform for building quality AI products at scale
Key strengths
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Recent changes
- Plans updated: Starter: $0/mo (free tier, $10 model credits, 1 GB processed data, 10k scores, 14-day retention). Pro: $249/mo ($100 credits, 5 GB processed data, 50k scores, 30-day retention, RBAC, priority support). Enterprise: custom pricing with custom retention, on-prem or hosted deployment.
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Braintrust — Technical Overview
The active observability platform for agents
Braintrust is built for AI engineering teams who need end-to-end visibility and control over agents running in production. It goes beyond passive logging by combining real-time trace observability with automated evaluation pipelines and an AI agent (Loop) that can autonomously generate prompts, scorers, and datasets.
Architecture highlights:
- Agent trace observability: Captures full execution traces across agent runs, enabling real-time monitoring and structured debugging of multi-step agent workflows.
- Evaluation engine: Supports LLM-as-a-judge, code-based, and human scoring — with up to 50k scores/month on the Pro tier.
- Brainstore + Nitro: A purpose-built database with the Nitro query engine optimized for fast retrieval over AI-generated data at scale.
- Loop AI agent: Autonomously surfaces patterns, diagnoses failures, and generates evaluation assets directly from production traces.
- Framework-agnostic SDKs: Python, TypeScript, Go, Ruby, and C# SDKs, plus MCP (Model Context Protocol) and S3 integrations.
- Deployment flexibility: Cloud-hosted or on-premises (Enterprise tier), with SOC 2 Type II, HIPAA, and GDPR compliance and hybrid deployment options.
- API available for programmatic access to all platform capabilities.
Pricing: Free tier available. Pro starts at $249/month. Enterprise is custom-priced with custom retention and on-prem options.