Pick LangSmith if
engineers who already write agent code and will open traces when a run surprises them.
Read the LangSmith pageLangSmith vs Opik
Our take
Pick LangSmith if engineers who already write agent code and will open traces when a run surprises them. Pick Opik if agent teams who will stay on OSS $0 or Free Cloud $0 (25k spans, 10 members), then buy Pro Cloud at $19/month when they need 100k spans and 50 seats.
Best for
LangSmith See what an agent did, then score it
Opik Spans you can self-host at $0 or rent from $0 Cloud / $19 Pro
Free plan
LangSmith $0 · / seat / month. 1 seat. 5,000 base traces/month, then pay-as-you-go. 7 LSU Fleet allowance/month. Community support
Opik $0 · self-host. Full observability + agent testing. Same codebase as hosted. Agent Playground included
Lowest paid
LangSmith Plus $39/mo
Opik Not published by the vendor
Coding agent
LangSmith
Opik Experiments + datasets
Runs where
LangSmith Hosted
Opik Local; you host it
Watch out
LangSmith Traces after 5k / 10k bill in arrears
Opik Free Cloud is 25k spans
Last checked
LangSmith 2026-10-22 · langchain.com/pricing
Opik 2026-10-22 · comet.com/site/pricing
Which one, then?
Pick Opik if
agent teams who will stay on OSS $0 or Free Cloud $0 (25k spans, 10 members), then buy Pro Cloud at $19/month when they need 100k spans and 50 seats.
Read the Opik page