AnyRouter API documentation: base URL, model ids, and request format

The AnyRouter API endpoint is:

https://anyrouter.dev/api/v1

All standard OpenAI-compatible routes are under this prefix: /v1/chat/completions, /v1/embeddings, /v1/models, etc.

Pass your API key in the standard Authorization header:

curl https://anyrouter.dev/api/v1/chat/completions \
  -H "Authorization: Bearer sk-ar-v1-placeholder" \
  -H "Content-Type: application/json" \
  -d '{"model":"anyrouter/free","messages":[{"role":"user","content":"Hi"}]}'

Keys start with sk-ar-v1-. Create one from the AnyRouter dashboard.

Model ids follow the provider/model convention:

• anthropic/claude-sonnet-4-5
• openai/gpt-5.5
• google/gemini-2.5-pro
• z-ai/glm-5.2
• anyrouter/free (shared pool free tier)

The provider prefix tells AnyRouter which upstream to route to. Omitting the prefix or using an unrecognized id returns a 404.

The request body follows the OpenAI Chat Completions schema. The most common fields:

Set stream: true to receive Server-Sent Events. AnyRouter forwards the upstream provider's streaming format directly. Handle the SSE stream the same way you would with the provider's native API.

AnyRouter returns standard HTTP status codes:

• 200 — success
• 400 — malformed request body
• 401 — invalid or missing API key
• 404 — model not found or provider not configured
• 429 — rate limit exceeded (see the 429 guide)
• 500/502/503 — upstream provider error or gateway issue

The full interactive API reference with every endpoint and schema is at docs.anyrouter.dev. For monitoring and debugging, use chmonitor.dev to inspect per-request traces including upstream, latency, tokens, and cost.