LangSmith

LangSmith is LangChain's cloud for tracing, evaluation, and deploying agents. Pricing is on langchain.com/pricing. Plus is $39 / seat / month. Startup is $1,400 / month for up to 10 seats. LangSmith Engine is $2,000 / month. Developer remains $0. This page used to say only "Free / Team paid" and still pointed at smith.langchain.com as if that were the whole story.

Use LangGraph for the open-source runtime. LangSmith is the hosted trace/eval/deploy layer around it.

Key Features

Tracing: Python and JS/TS SDKs. Works with LangGraph and other LLM apps.
Evals and datasets: Offline and online evals on the same workspace.
Deployment: Hosted agent deploy next to traces. Studio is part of that story.
LangSmith Engine: Separate $2,000 / month SKU on the pricing page. Do not treat it as included in Plus.
Fleet: The site still mentions a no-code builder. Confirm whether it is bundled or sold separately before you quote it.

Use Cases

Teams already on LangGraph who need hosted traces and deploys.
Eval-heavy products that outgrew local tracing.
Orgs that will pay $1,400 Startup instead of stitching Langfuse plus a host.

Limitation: seat and trace meters are not fully specified on the public cards we used. Confirm the checkout table. Enterprise is custom.

Pricing

langchain.com/pricing on 2026-08-17:

Plan	Price	Notes from that page
Developer	$0	Individual hosted tier.
Plus	$39 / seat / month	Team hosted tier.
Startup	$1,400 / month	Up to 10 seats.
Enterprise	Custom	Sales.
LangSmith Engine	$2,000 / month	Listed add-on.

Getting Started

Read langchain.com/langsmith.
pip install langsmith and send traces from a LangGraph app.
Stay on Developer until you know you need Plus seats.
Do not budget Engine as $0.

Frequently Asked Questions

Is it still just a generous free tier?

Developer is $0. Plus and Startup are paid and public.

Do I need LangGraph?

No, but the deepest deploy path is built around it.

Is Engine part of Plus?

It is $2,000 / month.

Alternatives

LangGraph: The OSS runtime under the cloud.
OpenAI Agents SDK: Official OpenAI runtime with its own tracing.
CrewAI: Role crews plus a different hosted cloud.

Tips

Quote $39 / $1,400 / $2,000, not "Team paid".
Keep smith.langchain.com as a login host if it still redirects, but cite langchain.com/langsmith as the product page.
Confirm Fleet. Names on that pricing grid move.

Conclusion

LangSmith is now a priced LangChain Cloud: $0 Developer, $39 Plus, $1,400 Startup, plus a $2,000 Engine add-on. Start at langchain.com/pricing, then keep LangGraph in the other tab.