head to head · open source
odysseus vs Langchain-Chatchat
odysseus has 87,357 GitHub stars, 903 forks, 1,233 open issues and last shipped 2 days ago. Langchain-Chatchat has 38,642 stars, 6,265 forks, 26 open issues and last shipped 10 months ago. odysseus leads on adoption by 126% (87,357 vs 38,642 stars). odysseus is written in Python under AGPL-3.0; Langchain-Chatchat is written in Python under Apache-2.0. odysseus has attracted 1% as many forks as stars, Langchain-Chatchat 16%. odysseus was the more recently maintained of the two, and both are self-hostable with no licence fee.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| odysseus | Langchain-Chatchat | |
|---|---|---|
| GitHub stars | ★ 87K | ★ 39K |
| License | AGPL-3.0 | Apache-2.0 |
| Written in | Python | Python |
| Last push | 2026-09-17 | 2025-11-10 |
| Forks | ⑂ 903 | ⑂ 6.3K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick odysseus if
- You weight community size — 87K stars and counting
- You want the AGPL-3.0 license terms
- Your stack matches Python
- You value the larger contributor base for long-term maintenance
pick Langchain-Chatchat if
- You want the Langchain-Chatchat feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Python
- You evaluated both and Langchain-Chatchat fits your workflow better
About odysseus
Odysseus is a self hosted AI workspace written in Python and released under the AGPL 3.0 or later licence, built for people who want chat, agents, research, documents, email, notes, tasks, and calendar in one deployment on infrastructure they control.
read the full odysseus overview →
About Langchain-Chatchat
Langchain Chatchat (formerly Langchain ChatGLM) is an open source RAG and Agent application built on the Langchain framework and designed to run against local large language models such as ChatGLM, Qwen, and Llama. It lives in the Python ecosystem, is distributed under the Apache 2.0 license, and is published on PyPI as langchain chatchat . The project targets Chinese language scenarios and open source models specifically, with the stated goal of providing a knowledge base question answering solution that can run entirely offline.
read the full Langchain-Chatchat overview →
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Frequently asked questions
Is odysseus or Langchain-Chatchat more popular?
odysseus has 87,357 GitHub stars and Langchain-Chatchat has 38,642. odysseus has the larger community by that measure.
Are odysseus and Langchain-Chatchat free?
Both are open source. odysseus is licensed under AGPL-3.0 and Langchain-Chatchat under Apache-2.0. Neither carries a licence fee.
What is the difference between odysseus and Langchain-Chatchat?
odysseus is written in Python and Langchain-Chatchat in Python. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, odysseus or Langchain-Chatchat?
Choose odysseus if you want the larger community (87,357 stars) or its AGPL-3.0 licence terms. Choose Langchain-Chatchat if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.