Building applications with LLMs through composability
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Requires Python: <4.0.0,>=3.10.0
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๐ฆ๏ธ๐ LangChain
Looking for the JS/TS version? Check out LangChain.js.
To help you ship LangChain apps to production faster, check out LangSmith. LangSmith is a unified developer platform for building, testing, and monitoring LLM applications.
Quick Install
pip install langchain
๐ค What is this?
LangChain is the easiest way to start building agents and applications powered by LLMs. With under 10 lines of code, you can connect to OpenAI, Anthropic, Google, and more. LangChain provides a pre-built agent architecture and model integrations to help you get started quickly and seamlessly incorporate LLMs into your agents and applications.
We recommend you use LangChain if you want to quickly build agents and autonomous applications. Use LangGraph, our low-level agent orchestration framework and runtime, when you have more advanced needs that require a combination of deterministic and agentic workflows, heavy customization, and carefully controlled latency.
LangChain agents are built on top of LangGraph in order to provide durable execution, streaming, human-in-the-loop, persistence, and more. (You do not need to know LangGraph for basic LangChain agent usage.)
๐ Documentation
For full documentation, see the API reference.
๐ Releases & Versioning
See our Releases and Versioning policies.
๐ Contributing
As an open-source project in a rapidly developing field, we are extremely open to contributions, whether it be in the form of a new feature, improved infrastructure, or better documentation.
For detailed information on how to contribute, see the Contributing Guide.
1.0.2
Oct 21, 2025
1.0.1
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1.0.0
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0.0.342
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0.0.309
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0.0.305
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0.0.304
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0.0.303
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0.0.302
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0.0.301
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0.0.297
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0.0.293
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0.0.155
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0.0.118
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0.0.117
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0.0.116
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0.0.115
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0.0.114
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0.0.113
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0.0.112
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0.0.111
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0.0.110
Mar 14, 2023
0.0.109
Mar 13, 2023
0.0.108
Mar 12, 2023
0.0.107
Mar 10, 2023
0.0.106
Mar 09, 2023
0.0.105
Mar 09, 2023
0.0.104
Mar 08, 2023
0.0.103
Mar 07, 2023
0.0.102
Mar 06, 2023
0.0.102rc0
Mar 05, 2023
0.0.101
Mar 04, 2023
0.0.101rc0
Mar 02, 2023
0.0.100
Mar 02, 2023
0.0.99
Mar 02, 2023
0.0.99rc0
Mar 02, 2023
0.0.98
Mar 01, 2023
0.0.97
Mar 01, 2023
0.0.96
Feb 28, 2023
0.0.95
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0.0.94
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0.0.93
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0.0.92
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0.0.91
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0.0.90
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0.0.89
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0.0.88
Feb 16, 2023
0.0.87
Feb 15, 2023
0.0.86
Feb 14, 2023
0.0.85
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0.0.84
Feb 12, 2023
0.0.83
Feb 11, 2023
0.0.82
Feb 10, 2023
0.0.81
Feb 09, 2023
0.0.80
Feb 08, 2023
0.0.79
Feb 07, 2023
0.0.78
Feb 06, 2023
0.0.77
Feb 03, 2023
0.0.76
Feb 02, 2023
0.0.75
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0.0.74
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0.0.73
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0.0.72
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0.0.71
Jan 27, 2023
0.0.70
Jan 26, 2023
0.0.69
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0.0.68
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0.0.67
Jan 22, 2023
0.0.66
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0.0.65
Jan 18, 2023
0.0.64
Jan 16, 2023
0.0.63
Jan 14, 2023
0.0.61
Jan 12, 2023
0.0.60
Jan 11, 2023
0.0.59
Jan 09, 2023
0.0.58
Jan 06, 2023
0.0.57
Jan 05, 2023
0.0.56
Jan 04, 2023
0.0.55
Jan 03, 2023
0.0.54
Jan 02, 2023
0.0.53
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0.0.52
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0.0.51
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0.0.50
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0.0.49
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0.0.48
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0.0.47
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0.0.46
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0.0.45
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0.0.44
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0.0.43
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0.0.42
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0.0.41
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0.0.40
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0.0.39
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0.0.38
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0.0.37
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0.0.36
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0.0.35
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0.0.34
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0.0.33
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0.0.32
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0.0.31
Dec 07, 2022
0.0.30
Dec 06, 2022
0.0.29
Dec 05, 2022
0.0.28
Dec 05, 2022
0.0.27
Dec 02, 2022
0.0.26
Dec 01, 2022
0.0.25
Nov 30, 2022
0.0.24
Nov 29, 2022
0.0.23
Nov 28, 2022
0.0.22
Nov 26, 2022
0.0.21
Nov 25, 2022
0.0.20
Nov 23, 2022
0.0.19
Nov 22, 2022
0.0.18
Nov 21, 2022
0.0.17
Nov 20, 2022
0.0.16
Nov 18, 2022
0.0.15
Nov 17, 2022
0.0.14
Nov 15, 2022
0.0.13
Nov 14, 2022
0.0.12
Nov 11, 2022
0.0.11
Nov 10, 2022
0.0.10
Nov 09, 2022
0.0.9
Nov 08, 2022
0.0.8
Nov 07, 2022
0.0.7
Nov 03, 2022
0.0.6
Nov 02, 2022
0.0.5
Nov 01, 2022
0.0.4
Oct 28, 2022
0.0.3
Oct 27, 2022
0.0.2
Oct 26, 2022
0.0.1
Oct 25, 2022
Wheel compatibility matrix
Files in release
Extras:
Dependencies:
langchain-core
(<2.0.0,>=1.0.0)
langgraph
(<1.1.0,>=1.0.0)
pydantic
(<3.0.0,>=2.7.4)