One LLM API for 470+ large language models

Access every major large language model through a single OpenAI-compatible LLM API — no per-provider accounts, no separate SDKs.

G0I is an LLM API that unifies large language models from every major lab. Call GPT, Claude, Gemini, Llama, DeepSeek, Qwen and hundreds more through one endpoint with one key.

Built for developers

470+ LLMs — frontier and open models, updated as new ones ship.
OpenAI-compatible — works with the OpenAI SDK and any OpenAI-compatible tooling.
Streaming & tools — token streaming, function/tool calling and vision supported.
Start free — a free token quota to test, paid plans when you scale.

Start in three steps

1 · Create an accountSign up at g0i.ai and grab an API key in seconds — no card required to start.

2 · Change one linePoint your existing OpenAI SDK at https://g0i.ai/v1. Same request shape, same response shape.

3 · Call any modelSwap the model field to use GPT, Claude, Gemini, Llama, DeepSeek and 470+ others — one key, one bill.

Minimal example

curl https://g0i.ai/v1/chat/completions \
  -H "Authorization: Bearer $G0I_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"gpt-5.4","messages":[{"role":"user","content":"Hello"}]}'

See every model in the catalog and read the quickstart.

Get your API key — start free →

Frequently asked questions

What is an LLM API?
An LLM API lets your application send prompts to large language models over HTTP. G0I provides one LLM API that reaches 470+ models.

Which LLM providers are included?
GPT, Claude, Gemini, Llama, DeepSeek, Qwen and many more — all through one endpoint and one API key.

How do I start?
Create a free account at g0i.ai, get an API key, point your OpenAI SDK at https://g0i.ai/v1, and call any model.