Is LangChain free? What it actually costs in 2026

What the free tier actually includes

• —The framework: none — MIT licence, read at the repository
• —LangSmith Developer: 1 seat, 5,000 base traces a month, then pay-as-you-go
• —LangSmith Plus: $39 a seat a month, 10,000 base traces included

Where the wall is

Trace 5,001, if you turn tracing on. LangSmith is opt-in — set the environment variable and every run is logged; leave it off and nothing is metered. The wall belongs to the observability product, not the code.

After that: LangSmith Plus $39 per seat a month with 10k base traces; usage beyond any plan at $1.50 per LangChain Compute Unit and $1.00 per Storage Unit; Enterprise by contact. Startups: up to $10,000 in credits.

Can you self-host LangChain? Yes

The framework runs anywhere. LangSmith's self-hosted data plane is an Enterprise feature. The alternatives on this page — calling the model SDK directly, LlamaIndex, Haystack — are open source too; the choice is about abstraction, not price.

What it actually takes to run one yourself

Real RAM against the documented minimum, monthly cost, setup time, and the one thing that catches people out.

When paying is still the right call

If you're deep into LangGraph for genuinely complex multi-agent orchestration, it's good at that — 1.0 (October 2025) brought stability, and LangSmith is excellent observability. A large team already productive on the ecosystem, using its integration breadth daily, has no urgent reason to churn. The alternatives matter most for new builds and for teams whose app outgrew the scaffolding.

What you are locked into

Moderate, and self-inflicted rather than contractual: your pipeline logic is written against LangChain's abstractions, so leaving means rewriting orchestration code (prompts, data, and vector stores all port cleanly). Teams report the rewrite is usually smaller than expected — often less code than the original.

If you would rather not pay: Direct SDKs (no framework)