Braintrust vs Inspect AI

A side-by-side look at pricing, capabilities, pros, cons, and our editorial scores.

	Braintrust Evaluation	Inspect AI Evaluation
Tagline	Eval, monitor, and improve AI products end-to-end.	Open-source LLM evaluation framework from the UK AI Security Institute with 200+ built-in benchmarks.
Category	Evaluation	Evaluation
Pricing	Freemium· Starter: $0 · Pro: $249 · Enterprise: Custom pricing	Free· Free and open source (MIT-style license); you pay only for underlying model API usage.
Model	Platform (any LLM)	Multi-model
Editorial score	8.9 / 10	7.2 / 10
Use cases	evalsmonitoringprompt management	llm-benchmarkingagent-evaluationsafety-testingcapture-the-flagcustom-evals
Pros	Full eval + observability in one tool Excellent UX Strong dataset/experiment tracking Closed loop dev → prod	Backed by the UK AI Security Institute — serious pedigree for safety work 200+ pre-built evaluations ready to run out of the box Supports 20+ model providers plus sandboxed code execution Composable Python API with CLI, Inspect View UI, and VS Code extension Fully open source with no vendor lock-in
Cons	Team pricing is steep Smaller than LangSmith ecosystem-wise	Python-first — no low-code path for non-engineers Running large eval suites incurs real model API costs Steeper learning curve than hosted eval platforms
Website	www.braintrust.dev	inspect.aisi.org.uk

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