Documentation
One OpenAI-compatible endpoint for 338 models. If your code talks to OpenAI, it talks to OpenKey — change the base URL and the key, keep everything else.
Make your first request
Full quickstart →curl https://api.openkey.ai/v1/chat/completions \
-H "Authorization: Bearer $OPENKEY_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "anthropic/claude-sonnet-4.5",
"messages": [{"role": "user", "content": "Hello"}]
}'import os
from openai import OpenAI
client = OpenAI(
base_url="https://api.openkey.ai/v1",
api_key=os.environ["OPENKEY_API_KEY"],
)
completion = client.chat.completions.create(
model="anthropic/claude-sonnet-4.5",
messages=[{"role": "user", "content": "Hello"}],
)
print(completion.choices[0].message.content)import OpenAI from "openai";
const client = new OpenAI({
baseURL: "https://api.openkey.ai/v1",
apiKey: process.env.OPENKEY_API_KEY,
});
const completion = await client.chat.completions.create({
model: "anthropic/claude-sonnet-4.5",
messages: [{ role: "user", content: "Hello" }],
});
console.log(completion.choices[0].message.content);Getting started
API reference
API reference
Endpoints, parameters, streaming, tools, and structured outputs — the full OpenAI-compatible surface.
Error semantics — our contract
Errors tell you the truth about what failed. Infrastructure problems never masquerade as auth errors, and rate limits fail loud.
Model routing & version pins
Which provider actually serves your request, and how we disclose model version changes.
Read these before you ship