head to head · open source
openapi-generator vs optillm
openapi-generator has 26,844 GitHub stars, 7,751 forks, 5,820 open issues and last shipped yesterday. optillm has 4,337 stars, 398 forks, 23 open issues and last shipped 3 days ago. openapi-generator leads on adoption by 519% (26,844 vs 4,337 stars). openapi-generator is written in Java under Apache-2.0; optillm is written in Python under Apache-2.0. openapi-generator has attracted 29% as many forks as stars, optillm 9%. openapi-generator 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
| openapi-generator | optillm | |
|---|---|---|
| GitHub stars | ★ 27K | ★ 4.3K |
| License | Apache-2.0 | Apache-2.0 |
| Written in | Java | Python |
| Last push | 2026-11-04 | 2026-11-02 |
| Forks | ⑂ 7.8K | ⑂ 398 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick openapi-generator if
- You weight community size — 27K stars and counting
- You want the Apache-2.0 license terms
- Your stack matches Java
- You value the larger contributor base for long-term maintenance
pick optillm if
- You want the optillm 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 optillm fits your workflow better
About openapi-generator
OpenAPI Generator Master ( 7.28.0 ): :star::star::star: If you would like to contribute, please refer to guidelines and a list of open tasks. :star::star::star: :bangbang: To migrate from Swagger Codegen to OpenAPI Generator, please refer to the migration guide :bangbang: :notebook with decorative cover: For more information, please refer to the Wiki page and FAQ :notebook with decorative cover: :notebook with decorative cover: The eBook A Beginner's Guide to Code Generation for REST APIs is a good starting point for beginners :notebook with decorative cover: :warning: If the OpenAPI spec, templates or any input…
read the full openapi-generator overview →
About optillm
OptiLLM 🚀 2 10x accuracy improvements on reasoning tasks with zero training 🤗 HuggingFace Space • 📓 Colab Demo • 💬 Discussions OptiLLM is an OpenAI API compatible optimizing inference proxy that implements 20+ state of the art techniques to dramatically improve LLM accuracy and performance on reasoning tasks without requiring any model training or fine tuning. It is possible to beat the frontier models using these techniques across diverse tasks by doing additional compute at inference time. A good example of how to combine such techniques together is the CePO approach from Cerebras. ✨ Key Features 🎯…
read the full optillm overview →
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Frequently asked questions
Is openapi-generator or optillm more popular?
openapi-generator has 26,844 GitHub stars and optillm has 4,337. openapi-generator has the larger community by that measure.
Are openapi-generator and optillm free?
Both are open source. openapi-generator is licensed under Apache-2.0 and optillm under Apache-2.0. Neither carries a licence fee.
What is the difference between openapi-generator and optillm?
openapi-generator is written in Java and optillm 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, openapi-generator or optillm?
Choose openapi-generator if you want the larger community (26,844 stars) or its Apache-2.0 licence terms. Choose optillm if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.