Inspect AI vs Weights & Biases

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

	Inspect AI Evaluation	Weights & Biases Evaluation
Tagline	Open-source LLM evaluation framework from the UK AI Security Institute with 200+ built-in benchmarks.	The ML experiment tracker, now with LLM eval features.
Category	Evaluation	Evaluation
Pricing	Free· Free and open source (MIT-style license); you pay only for underlying model API usage.	Freemium· Free: $0/mo · Pro: Starts at $60/month · Enterprise: Custom plans · Personal: $0/mo · Advanced Enterprise: Custom plan
Model	Multi-model	Platform (any LLM)
Editorial score	7.2 / 10	8.4 / 10
Use cases	llm-benchmarkingagent-evaluationsafety-testingcapture-the-flagcustom-evals	ML experimentsLLM evalWeave
Pros	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	Industry-standard for ML tracking Weave adds LLM-native eval Mature, reliable Strong enterprise features
Cons	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	Heavier UX than LLM-native tools LLM features still catching up
Website	inspect.aisi.org.uk	wandb.ai

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