openapi: 3.0.1
info:
  title: Chutes Chat API
  description: 'Specification of the Chutes API. Chutes is a permissionless, serverless AI compute platform on Bittensor Subnet 64. It exposes two REST surfaces: an OpenAI-compatible inference endpoint at https://llm.chutes.ai/v1 for chat completions and model listing across hundreds of open-source models, and a management API at https://api.chutes.ai for building images and deploying, listing, and operating chutes (serverless AI apps). All requests authenticate with a Bearer API key (prefix `cpk_`).'
  termsOfService: https://chutes.ai/terms
  contact:
    name: Chutes Support
    url: https://chutes.ai/docs
  version: '1.0'
servers:
- url: https://llm.chutes.ai/v1
  description: OpenAI-compatible LLM inference endpoint (chat completions, models).
- url: https://api.chutes.ai
  description: Management API for chutes and images.
security:
- bearerAuth: []
tags:
- name: Chat
  description: OpenAI-compatible chat completions.
paths:
  /chat/completions:
    post:
      operationId: createChatCompletion
      servers:
      - url: https://llm.chutes.ai/v1
      tags:
      - Chat
      summary: Create a chat completion.
      description: 'OpenAI-compatible chat completions. Reachable for any model currently running on the Chutes network via the shared endpoint https://llm.chutes.ai/v1. Set `stream: true` to receive the response as Server-Sent Events.'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/CreateChatCompletionRequest'
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/CreateChatCompletionResponse'
            text/event-stream:
              schema:
                type: string
                description: 'Server-Sent Events stream of `chat.completion.chunk` objects when `stream` is true, terminated by `data: [DONE]`.'
        '401':
          description: Unauthorized - missing or invalid API key.
        '422':
          description: Validation error.
        '429':
          description: Too Many Requests - rate or quota limit exceeded.
components:
  schemas:
    CreateChatCompletionResponse:
      type: object
      properties:
        id:
          type: string
        object:
          type: string
          example: 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'
    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:
          type: string
    CreateChatCompletionRequest:
      type: object
      required:
      - model
      - messages
      properties:
        model:
          type: string
          description: Model identifier, e.g. `deepseek-ai/DeepSeek-V3-0324`.
        messages:
          type: array
          items:
            $ref: '#/components/schemas/ChatMessage'
        max_tokens:
          type: integer
        temperature:
          type: number
          format: float
        top_p:
          type: number
          format: float
        stream:
          type: boolean
          default: false
        stop:
          type: array
          items:
            type: string
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: 'Chutes API key passed as `Authorization: Bearer cpk_...`. Management endpoints alternatively accept a Bittensor hotkey signature (X-Chutes-Hotkey, X-Chutes-Signature, X-Chutes-Nonce).'