SoftwareFramework

LangChain (framework)

LangChain (framework) is a framework maintained by LangChain Inc.3 7 Its source code is public1 under the MIT License3.

LangChain is an open-source Python framework for building agents and LLM applications. It gives a standard interface across model providers and many third-party integrations. Its agent API is built on LangGraph, and a JavaScript/TypeScript version, LangChain.js, lives in a separate repository.2 5

Repository: Repository (external site: github.com)
Documentation: Documentation (external site: docs.langchain.com)
License: LICENSE (external site: github.com)
Release notes: Releases (external site: github.com)

Last reviewedSep 29, 2026Entry updated Sep 29, 2026Documented release Unknown

Availability and license

Overall availability

Public

Documented as available to the general public. Access conditions and license terms may still apply.1 3

Availability fact review: not separately recorded

Availability is separate from permission: read the license before using or redistributing.

MIT License (external site: github.com)3
Applies to: Code · SPDX MIT · on the rubric’s OSI-approved software-license list · fact-level rights review not recorded
Plain-language guide to the MIT License

The MIT license covers the open-source library. The README points to LangSmith, a separate LangChain product, for debugging, evaluating, and deploying agents.3 2

Component reuse rights

A readable or downloadable component is not automatically reusable. These indicators concern recorded license evidence, not system certification.

weights: Unknown — no complete fact-level rights review
code: Unknown — no complete fact-level rights review
data: Unknown — no complete fact-level rights review
documentation: Unknown — no complete fact-level rights review

No complete system-rights review is recorded for this release.

Public materials checklist

Items for a framework under USASI rubric v0.2. Unknown means unassessed or insufficient evidence.

Public materials checklist for LangChain (framework)
Item	Status	Notes and evidence
Source codeIs the source code publicly readable?	Public	1
DocumentationIs user documentation published?	Public	Conceptual docs are at docs.langchain.com, and the API reference is at reference.langchain.com.5 2
InstallationAre installation instructions or packages publicly available?	Public	Installed from PyPI with pip or uv. Model providers are added as separate integration packages.6
Supported platformsAre supported operating systems or hardware documented?	Public	The install guide lists Python 3.10 or newer as a requirement. It does not list operating-system restrictions.6
Release statusAre versioned releases published?	Public	Versioned releases are published on GitHub for each package, including langchain, langchain-core, and the provider integrations.4

What it is useful for

Building tool-using agents; switching between model providers through one interface; and connecting models to data sources, vector stores, and retrievers through integration packages.2 5

Organization context

LangChain

U.S. eligibility

Project eligibility rests on documented governing or maintaining entities, not on contributors.

Eligible · basis: U.S.-governed project

The repository sits in the langchain-ai GitHub organization, and its LICENSE file assigns copyright to LangChain, Inc. LangChain's about page lists LangChain among the open-source frameworks the company develops and says the company is headquartered in San Francisco. Its terms of service identify LangChain Inc. as a Delaware corporation. No foundation or multi-organization governance body is documented.3 7 8

Assessed Sep 29, 2026

Sources

1.
langchain-ai/langchain (external site: github.com)
LangChain · Repository · accessed Sep 29, 2026
2.
LangChain README (external site: github.com)
LangChain · Repository · accessed Sep 29, 2026
3.
LangChain LICENSE (external site: github.com)
LangChain · License · accessed Sep 29, 2026
4.
LangChain releases (external site: github.com)
LangChain · Release notes · accessed Sep 29, 2026
5.
LangChain overview - Docs by LangChain (external site: docs.langchain.com)
LangChain · Documentation · accessed Sep 29, 2026
6.
Install LangChain - Docs by LangChain (external site: docs.langchain.com)
LangChain · Documentation · accessed Sep 29, 2026
7.
About LangChain: an open platform to own your intelligence (external site: langchain.com)
LangChain · Official page · accessed Sep 29, 2026
8.
Terms of Service (external site: langchain.com)
LangChain · Official page · published Jun 2, 2026 · accessed Sep 29, 2026

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APA style

USASI. (2026, September 29). LangChain (framework). United States of America Superintelligence. https://unitedstatesofamericasuperintelligence.com/open/langchain-framework/

BibTeX

@misc{usasi_langchain_framework,
  author = {{USASI}},
  title = {LangChain (framework)},
  year = {2026},
  month = sep,
  howpublished = {\url{https://unitedstatesofamericasuperintelligence.com/open/langchain-framework/}},
  note = {United States of America Superintelligence. Last updated 2026-09-29}
}

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