STABLE
The API for
problem solvers
Open-source DeepSeek, Kimi, GLM, Qwen, MiniMax and proprietary Claude, GPT, Gemini: 140+ models behind one OpenAI-compatible key, with failover.
No credit card · trial credits on request via ticket
Built for production
- A route keeps failing? Requests fail over to a healthy route automatically.
- Need open-source and proprietary models in one place? 140+ models across text, image, video and audio — DeepSeek, Kimi, GLM, Qwen and MiniMax next to Claude, GPT and Gemini — with new models added at launch.
- Billing hard to reconcile? Pay as you go in USD, no subscription or minimum spend, every call itemized in the console.
- Stuck integrating? OpenAI, Claude and Gemini native protocols, step-by-step docs and ticket support. Change
base_urland the API key, keep your existing SDK.
Popular models
| Model | Price (USD) |
|---|---|
claude-opus-5-5 | $3.20 input / $16.00 output per 1M tokens |
claude-sonnet-5-5 | $1.60 input / $8.00 output per 1M tokens |
claude-haiku-5-5 | $0.08 input / $0.40 output per 1M tokens |
gpt-6.1-sol | $1.60 input / $8.00 output per 1M tokens |
gemini-3.1-pro-preview | $0.20 input / $1.20 output per 1M tokens |
deepseek-v4.1-flash | $0.2941 input / $1.1765 output per 1M tokens |
kimi-k3 | $2.40 input / $12.00 output per 1M tokens |
glm-5.3 | $0.9412 input / $3.2941 output per 1M tokens |
qwen3.8-max | $2.00 input / $6.00 output per 1M tokens |
dreamina-seedance-2-5-260628 | $0.2196 / second at 720p (estimated; billed by tokens) |
gpt-image-2.5 | $2.75 input / $16.50 output per 1M tokens |
grok-imagine-video-1.5 | $0.08 / second |
Get started
- Create an account and an API key in the console.
- Point your OpenAI SDK at
https://api.onefast.ai/v1. - Send your first request — see the Quickstart.