LiteLLM vs One API
A side-by-side comparison of two self-hosted local llm runners options — licensing, setup difficulty, resource needs, and what each one replaces.
LiteLLM
Unified proxy and gateway for 100+ LLM APIs
VS
One API
Unified OpenAI-compatible gateway for many LLM providers
| Feature | LiteLLM | One API |
|---|---|---|
| Deploy effort | Under-an-hour setup | Under-an-hour setup |
| Health score | 100 · Excellent | 61 · Good |
| Category | Local LLM Runners | Local LLM Runners |
| License | MIT | MIT |
| Language | Python | Go |
| Setup difficulty | Medium | Medium |
| Min. RAM | 1,024 MB | 256 MB |
| Deployment | docker, kubernetes, bare-metal | docker, binary |
| GitHub stars | ★ 59,511 | ★ 37,009 |
| First released | 2023 | 2023 |
| Replaces | OpenRouter | OpenAI API, OpenRouter |
What are LiteLLM and One API?
LiteLLM
LiteLLM provides a proxy server and Python SDK that exposes a single OpenAI-compatible interface to over a hundred LLM providers. It adds load balancing, spend tracking, caching, and key management.
- One API for many providers
- Spend and rate tracking
- Load balancing and fallbacks
- Virtual API keys
One API
One API is an LLM API management and distribution system that exposes a single OpenAI-compatible endpoint while routing to many upstream providers. It adds key management, channel load balancing, usage tracking and multi-user billing.
- Unified OpenAI-compatible API
- Channel load balancing
- Token and quota management
- Multi-user support
LiteLLM vs One API: key differences
LiteLLM is written in Python, while One API is built with Go. One API is the lighter option, starting around 256 MB of RAM against 1,024 MB for LiteLLM.
Why pick each one
Choose LiteLLM if…
- OpenAI-compatible interface
- Spend tracking built in
- Supports 100+ providers
Watch out for
- Config can sprawl
- Some features enterprise-only
Choose One API if…
- Single OpenAI-compatible endpoint
- Built-in usage billing
- Easy Docker deployment
Watch out for
- Documentation mostly Chinese
- Scaling needs external database
Frequently asked questions
Is LiteLLM or One API better?
Neither is universally better. LiteLLM has the larger community; both share a medium setup difficulty, so the decision comes down to features and licensing.
Are LiteLLM and One API free and open-source?
Yes. LiteLLM is licensed under MIT and One API under MIT. Both can be self-hosted at no software cost.
Can I run LiteLLM and One API with Docker?
LiteLLM: yes. One API: yes.
Which is lighter on resources, LiteLLM or One API?
One API has the smaller minimum footprint at 256 MB of RAM, compared to about 1,024 MB for LiteLLM. Real-world usage depends on library size, user count, and enabled features.