LangChain
Python framework of interoperable components and integrations for building agents and LLM apps, with LangGraph and Deep Agents layered above it.
Harness by LangChain
Install
From the package registry. Read the repository before you give any tool access to your data.
pip install langchain
Get the weekly diff
The weekly diff: one email a week with new agent tools, notable updates and grade changes, plus security alerts for tools you follow. Double opt-in, one-click unsubscribe.
About
Use cases: agent-orchestration, knowledge-base
Reviews
Write a reviewNo reviews yet. Installed it? Reviews come from verified installers only. How reviews work
Fact sheet
- Languages
- PythonREADME
- Packages
- langchain (pypi)README
- Observability
- LangSmithREADME
- Deploys to
- langsmith-deploymentREADME
- Maturity
- Stablegithub.com
Facts extracted by Claude Sonnet 5.5 from the linked sources on Oct 24, 2026; reviewed Oct 24, 2026. Wrong fact? Tell us.
Alternatives
Frameworks for the same language with a similar way of orchestrating agents.
- 0.853score
LlamaIndex
LlamaIndex
Open-source Python toolkit for RAG and agents over your own data, with event-driven workflows and 300+ integration packages.
HarnessAFreshness: A★ 52.6K↓ 1.4M/wk - 0.748score
LangGraph
LangChain
Low-level Python orchestration framework for long-running stateful agents, with durable execution, human review points and short- and long-term memory.
HarnessAFreshness: A★ 43.8K↓ 13.1M/wk - 0.732score
CrewAI
CrewAI
Open-source Python framework for multi-agent workflows, with role-based Crews and event-driven Flows.
HarnessAFreshness: A★ 60.1K↓ 644.6K/wk - 0.727score
Agno
Agno
Python framework and runtime for building agents, serving them over a REST API and MCP server, and managing them from a web control plane.
HarnessAFreshness: A★ 42.9K↓ 519.4K/wk - 0.627score
AutoGen
Microsoft
Archived Microsoft Python framework for multi-agent apps; Microsoft directs new users to Microsoft Agent Framework.
HarnessAFreshness: A★ 61.5K↓ 89K/wk
Compare and alternatives
- Alternatives to LangChain →
- LangChain vs Strands Agents
- GitHub Copilot SDK vs LangChain
- Genkit vs LangChain
Featured in
Signals
- Stars
- 148,371
- Forks
- 24,904
- Open issues
- 551
- Weekly downloads
- 37,334,710
- Last commit
- Oct 24, 2026 (3 days ago)
- Last release
- Oct 22, 2026 (4 days ago)
- Last package publish
- Oct 21, 2026 (5 days ago)
From GitHub (fetched Oct 24, 2026) and the package registry.
Details
- Packages
- pypi
langchain - License
- MIT
- Repository
- github.com/langchain-ai/langchain
- Website
- www.langchain.com/
- First seen
- Oct 24, 2026
- Last checked
- Oct 24, 2026
More from LangChain
- 0.748score
LangGraph
LangChain
Low-level Python orchestration framework for long-running stateful agents, with durable execution, human review points and short- and long-term memory.
HarnessAFreshness: A★ 43.8K↓ 13.1M/wk - 0.740score
Deep Agents
LangChain
Opinionated agent harness on LangGraph with sub-agents, filesystem access, context management, persistent memory and approval of tool calls.
HarnessAFreshness: A★ 30.6K↓ 1.9M/wk - 0.717score
LangGraph.js
LangChain
Open-source agent harness from LangChain for building agents with code, with LangSmith for testing and monitoring.
HarnessAFreshness: A★ 3.4K↓ 2.3M/wk - 0.715score
LangMem
LangChain
Library that lets LangGraph agents extract, consolidate and search their own long-term memory.
InfrastructureAFreshness: A★ 1.7Kmemory - 0.714score
LangChain.js
LangChain
JavaScript and TypeScript framework of interoperable components for building LLM apps and agents, with LangGraph.js and Deep Agents above it.
HarnessAFreshness: A★ 18.3K - 0.613score
Deep Agents (JavaScript)
LangChain
The batteries included agent harness.
HarnessAFreshness: A★ 1.6K
Cite this page
LangChain. Agent Mart. https://agentmart.dev/harnesses/langchain (last updated 2026-10-24)