WanAPIs Chat API

openapi: 3.2.0
info:
  title: WanAPIs Unified AI Chat API
  version: '2026-05-27'
  summary: OpenAI-compatible AI gateway aggregating GPT, Claude, Gemini, DeepSeek and other LLM, image, video, and audio model providers behind a single key.
  description: 'WanAPIs (https://wanapis.com) is a developer-focused AI API gateway. Clients

    issue OpenAI-style requests against `https://api.wanapis.com/v1`; the

    platform routes them to the appropriate upstream model provider (OpenAI,

    Anthropic, Google, DeepSeek, Moonshot, Alibaba, xAI, Mistral, Stability,

    Midjourney, etc.) and applies per-project quota, metering, channel

    routing, and failover.


    This OpenAPI is **hand-authored** by API Evangelist. WanAPIs publishes no

    machine-readable spec — `https://api.wanapis.com/openapi.json` returns the

    admin dashboard. Operations included here are taken from

    https://wanapis.com/docs and https://wanapis.com/pricing and reflect the

    OpenAI-compatible surface plus the documented WanAPIs `/responses` and

    async task patterns. Request and response schemas mirror the OpenAI HTTP

    API by convention; consult the upstream OpenAI reference for full field

    semantics.

    '
  termsOfService: https://wanapis.com/
  contact:
    name: WanAPIs Support
    email: support@wanapis.com
    url: https://wanapis.com/
  license:
    name: Proprietary
    url: https://wanapis.com/
servers:
- url: https://api.wanapis.com/v1
  description: WanAPIs production OpenAI-compatible base URL.
security:
- bearerAuth: []
tags:
- name: Chat
  description: Chat completion endpoints (OpenAI Chat Completions compatible).
paths:
  /chat/completions:
    post:
      tags:
      - Chat
      operationId: createChatCompletion
      summary: Create a chat completion
      description: 'OpenAI-compatible chat completions. Set `model` to any model slug

        available in the WanAPIs marketplace (e.g. `claude-opus-4-7`,

        `deepseek-v4-pro`, `gemini-3.5-flash`, `gpt-5.5`).

        '
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/ChatCompletionRequest'
            examples:
              deepseek:
                summary: DeepSeek chat completion
                value:
                  model: deepseek-v4-pro
                  messages:
                  - role: user
                    content: 用三句话解释 RAG
      responses:
        '200':
          description: Chat completion result.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ChatCompletionResponse'
            text/event-stream:
              schema:
                type: string
                description: 'Server-Sent Events stream of `ChatCompletionChunk` objects when `stream: true`.'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '403':
          $ref: '#/components/responses/Forbidden'
        '429':
          $ref: '#/components/responses/RateLimited'
        '500':
          $ref: '#/components/responses/UpstreamFailure'
components:
  schemas:
    Usage:
      type: object
      properties:
        prompt_tokens:
          type: integer
        completion_tokens:
          type: integer
        total_tokens:
          type: integer
    ChatMessage:
      type: object
      required:
      - role
      - content
      properties:
        role:
          type: string
          enum:
          - system
          - user
          - assistant
          - tool
        content:
          oneOf:
          - type: string
          - type: array
            items:
              type: object
        name:
          type: string
        tool_call_id:
          type: string
        tool_calls:
          type: array
          items:
            type: object
    ChatCompletionResponse:
      type: object
      properties:
        id:
          type: string
        object:
          type: string
          const: chat.completion
        created:
          type: integer
        model:
          type: string
        choices:
          type: array
          items:
            type: object
            properties:
              index:
                type: integer
              message:
                $ref: '#/components/schemas/ChatMessage'
              finish_reason:
                type: string
        usage:
          $ref: '#/components/schemas/Usage'
    Error:
      type: object
      properties:
        error:
          type: object
          properties:
            message:
              type: string
            type:
              type: string
            code:
              type: string
            param:
              type: string
              nullable: true
    ChatCompletionRequest:
      type: object
      required:
      - model
      - messages
      properties:
        model:
          type: string
          description: Marketplace model slug (e.g. claude-opus-4-7).
        messages:
          type: array
          items:
            $ref: '#/components/schemas/ChatMessage'
        stream:
          type: boolean
          default: false
        max_tokens:
          type: integer
        temperature:
          type: number
          minimum: 0
          maximum: 2
        top_p:
          type: number
          minimum: 0
          maximum: 1
        n:
          type: integer
          default: 1
        stop:
          oneOf:
          - type: string
          - type: array
            items:
              type: string
        presence_penalty:
          type: number
        frequency_penalty:
          type: number
        seed:
          type: integer
        response_format:
          type: object
        tools:
          type: array
          items:
            type: object
        tool_choice:
          oneOf:
          - type: string
          - type: object
        user:
          type: string
  responses:
    RateLimited:
      description: Rate limit or quota exceeded.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    Forbidden:
      description: Key does not have access to the requested model or feature.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    Unauthorized:
      description: Missing or invalid API key.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    UpstreamFailure:
      description: Upstream provider failure (500–504). Retry with exponential backoff; WanAPIs may auto-failover to a configured channel.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      bearerFormat: API Key
      description: 'Authenticate every request with `Authorization: Bearer <wanapis_api_key>`.

        Keys are issued per project in the WanAPIs dashboard and may be scoped

        with quota and model availability.

        '