openapi: 3.1.0
info:
  title: OpenRouter Chat Providers API
  description: OpenRouter provides unified access to hundreds of AI models through a single API endpoint. It implements the OpenAI API specification for chat completions, allowing developers to use any model with the same request and response format. The API also exposes model discovery, generation statistics, credits and balance information, and provisioning endpoints for programmatic key management.
  version: '1.0'
  contact:
    name: OpenRouter
    url: https://openrouter.ai/
  license:
    name: Proprietary
    url: https://openrouter.ai/terms
servers:
- url: https://openrouter.ai/api/v1
  description: OpenRouter production API
security:
- BearerAuth: []
tags:
- name: Providers
  description: List supported providers.
paths:
  /providers:
    get:
      operationId: listProviders
      summary: List providers
      description: Returns the list of supported model providers.
      tags:
      - Providers
      responses:
        '200':
          description: List of providers.
          content:
            application/json:
              schema:
                type: object
components:
  securitySchemes:
    BearerAuth:
      type: http
      scheme: bearer
      bearerFormat: OPENROUTER_API_KEY
externalDocs:
  description: OpenRouter API Reference
  url: https://openrouter.ai/docs/api/reference/overview