optillm
Inference proxy that applies reasoning techniques to improve LLM answers.
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About optillm
optillm is listed in our agent infra category and is aimed at builders. Inference proxy that applies reasoning techniques to improve LLM answers. Pricing, as the maker states it: Open source. Maturity: Active. We last checked the official link on 2026-10-16.
What is optillm?
optillm is an OpenAI API-compatible optimizing inference proxy that applies 20+ reasoning techniques to improve LLM accuracy on reasoning tasks without training or fine-tuning.
Its README claims 2-10x accuracy improvements on reasoning tasks.
Sources: the official README and our directory listing, checked 2026-10-18. Official site: github.com/algorithmicsuperintelligence/optillm.
Who is optillm for?
Developers who want better reasoning from existing models by changing only the endpoint.
optillm at a glance
- Open source: Yes (Apache License 2.0)
- GitHub: algorithmicsuperintelligence/optillm · 4,325 stars (as of Oct 21, 2026)
Key features
- OpenAI-compatible proxy
- 20+ inference-time techniques
- No training required
optillm FAQ
What is optillm?
optillm is an OpenAI API-compatible optimizing inference proxy that applies 20+ reasoning techniques to improve LLM accuracy on reasoning tasks without training or fine-tuning.
Who is optillm for?
Developers who want better reasoning from existing models by changing only the endpoint.
Is optillm free?
optillm's pricing, as the maker states it: Open source. Open-source tools are free to use, though you may still pay for model API usage or a hosted plan. Check the official site for current plans.
Is optillm open source?
Yes. optillm is released under the Apache License 2.0, according to its GitHub repository.
What are alternatives to optillm?
Similar tools include LiteLLM, Kong Gateway, opencodex, TypeSafe Jev, Agent Mesh and Agent Resource Market.
optillm ratings and reviews
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