Responses

Access multiple AI models through a unified, stateless API.

OpenRouter’s Responses API (Beta) provides an OpenAI-compatible interface for accessing multiple AI models through a unified, stateless API. It is designed as a drop-in replacement for OpenAI’s Responses API with enhanced capabilities including reasoning, tool calling, and web search integration.

For details, see examples in cookbook/90_models/openrouter/responses.

Example	Description
Basic	Use OpenRouter’s Responses API (beta) with OpenAI-compatible requests across multiple models.
Fallback	Route requests with fallback models using OpenRouter’s dynamic model routing.
Streaming	Stream OpenRouter’s Responses API output. Requires OPENROUTER_API_KEY.
Structured Output	Return Pydantic-validated structured output with OpenRouter’s Responses API.
Tool Use	Call tools through OpenRouter’s Responses API endpoint.