Braintrust vs LM Evaluation Harness

Braintrust

6.8 #13 in AI Agent Observability Tools

About Braintrust

LM Evaluation Harness

6.7 #19 in AI LLM Evaluation Tools

About LM Evaluation Harness
BraintrustLM Evaluation Harness
Free planYesYes
Free trialNoNo
Paid from$249/moFree
Open sourceNoNo
Platformsapi, self-hosted, Webapi, Linux, self-hosted
Free planYes—
Paid from249 /mo—
Prompt versioningYes—
Deployment—self-hosted

Both are listed in Best AI LLM Evaluation Tools, Best LLM Evaluation Tools. On Everything Xiaomi, Braintrust scores higher on our published basis.