RouterPlex Messages API

openapi: 3.2.0
info:
  title: RouterPlex Messages API
  version: 1.0.0
  description: RouterPlex is an AI gateway that exposes OpenAI-compatible chat completions and image generation, a Responses route for Codex custom providers, and Anthropic-compatible messages through a RouterPlex API key.
  contact:
    url: https://docs.routerplex.com/
servers:
- url: https://api.routerplex.com/v1
  description: RouterPlex production API
security:
- RouterPlexApiKey: []
tags:
- name: Messages
paths:
  /messages:
    post:
      summary: Create an Anthropic-compatible message
      operationId: createMessage
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - model
              - messages
              properties:
                model:
                  type: string
                  description: A model ID from the RouterPlex catalog.
                messages:
                  type: array
                  minItems: 1
                  items:
                    type: object
                    additionalProperties: true
                max_tokens:
                  type: integer
                  minimum: 1
                stream:
                  type: boolean
                  default: false
              additionalProperties: true
      responses:
        '200':
          description: Message response, or a streaming response when stream is true.
        '401':
          description: Missing or invalid API key.
        '429':
          description: Rate limit or spend limit reached.
      tags:
      - Messages
components:
  securitySchemes:
    RouterPlexApiKey:
      type: http
      scheme: bearer
      bearerFormat: RouterPlex API key
      description: Create and manage API keys in the RouterPlex dashboard.