Open source Self-hostable MCP support free
LicenseMIT
Starting priceBYOK usage cost
Model supportbyok
Languagespython, typescript
GitHub stars140.3k
Last activity2026-06-26
VerifiedFri Jun 26 2026 00:00:00 GMT+0000 (Coordinated Universal Time)
Verified byseed
The original, widely-adopted framework for building LLM apps, providing chains, prompts, tools, retrieval, and the foundation under LangGraph and LangSmith.
Strengths
- Largest ecosystem of integrations
- Mature and battle-tested
Tradeoffs
- Broad, sometimes leaky abstractions
- Agent orchestration has moved to LangGraph