Pick Braintrust if
aI teams who will write a scorer and pay when processed data or scores blow past Starter.
Read the Braintrust pageBraintrust vs LangSmith
Our take
Pick Braintrust if aI teams who will write a scorer and pay when processed data or scores blow past Starter. Pick LangSmith if engineers who already write agent code and will open traces when a run surprises them. Skip Braintrust if developers who only want a $0 request table (Helicone).
LangSmith
LangChain’s hosted observability and eval
Best for
Braintrust Measure the agent before you ship
LangSmith See what an agent did, then score it
Free plan
Braintrust $0 · /month. $10 model credits + token rates. 1 GB processed data, then $4/GB. 10k scores, then $2.50/1k. 14-day retention. Unlimited users, projects, datasets, playgrounds, experiments. No credit card
LangSmith $0 · / seat / month. 1 seat. 5,000 base traces/month, then pay-as-you-go. 7 LSU Fleet allowance/month. Community support
Lowest paid
Braintrust Pro $249/mo
LangSmith Plus $39/mo
Coding agent
Braintrust Loop agent
LangSmith
Runs where
Braintrust
LangSmith Hosted
Watch out
Braintrust $0 is the platform fee
LangSmith Traces after 5k / 10k bill in arrears
Last checked
Braintrust 2026-10-22 · braintrust.dev/pricing
LangSmith 2026-10-22 · langchain.com/pricing
Which one, then?
Pick LangSmith if
engineers who already write agent code and will open traces when a run surprises them.
Read the LangSmith page