Hyperbolic Chat Completions API

openapi: 3.1.0
info:
  title: Hyperbolic Chat Completions API
  description: >
    OpenAI-compatible chat completions endpoint for the Hyperbolic Serverless
    Inference service. Serves 25+ open-source LLMs including Llama 3.1
    8B/70B/405B, Qwen 2.5, DeepSeek V3, DeepSeek R1, Hermes 3, Mistral, and
    multimodal vision models (Llama 3.2 Vision, Qwen2-VL). Supports streaming,
    function/tool calling, structured JSON output, and chain-of-thought
    reasoning models. Drop-in OpenAI SDK replacement — change `api_key` and
    `base_url` only.
  version: v1
  contact:
    name: Hyperbolic Support
    email: support@hyperbolic.ai
    url: https://docs.hyperbolic.ai
  license:
    name: Hyperbolic Terms of Use
    url: https://www.hyperbolic.ai/terms-of-use

servers:
  - url: https://api.hyperbolic.xyz/v1
    description: Hyperbolic Production Inference Server

security:
  - BearerAuth: []

tags:
  - name: Chat Completions
    description: Generate chat-style completions from open-source LLMs

paths:
  /chat/completions:
    post:
      summary: Hyperbolic Create A Chat Completion
      description: >
        Create a chat completion using one of the open-source LLMs served by
        Hyperbolic. The request and response shape is fully OpenAI-compatible:
        send a list of messages with role (`system`, `user`, `assistant`,
        `tool`) and content (text or, for vision models, image_url blocks).
        Streaming is enabled by setting `stream: true`. Tool calling, structured
        outputs (`response_format`), and reasoning models (DeepSeek R1) are
        supported.
      operationId: createChatCompletion
      tags:
        - Chat Completions
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/ChatCompletionRequest'
            examples:
              SimpleChat:
                summary: Simple chat with DeepSeek V3
                value:
                  model: deepseek-ai/DeepSeek-V3
                  messages:
                    - role: user
                      content: What is the capital of France?
                  max_tokens: 256
                  temperature: 0.7
              Llama405B:
                summary: Llama 3.1 405B reasoning
                value:
                  model: meta-llama/Meta-Llama-3.1-405B-Instruct
                  messages:
                    - role: system
                      content: You are a careful research assistant.
                    - role: user
                      content: Summarize the difference between BF16 and FP8 inference.
                  max_tokens: 512
                  temperature: 0.5
                  stream: false
              ToolUse:
                summary: Function calling
                value:
                  model: meta-llama/Meta-Llama-3.1-70B-Instruct
                  messages:
                    - role: user
                      content: What is the weather in Reston, VA?
                  tools:
                    - type: function
                      function:
                        name: get_weather
                        description: Get current weather for a location
                        parameters:
                          type: object
                          properties:
                            location:
                              type: string
                              description: City and state
                          required:
                            - location
                  tool_choice: auto
      responses:
        '200':
          description: Successful chat completion response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ChatCompletionResponse'
              examples:
                SimpleResponse:
                  summary: Simple chat completion
                  value:
                    id: chatcmpl-abc123
                    object: chat.completion
                    created: 1748133600
                    model: deepseek-ai/DeepSeek-V3
                    choices:
                      - index: 0
                        message:
                          role: assistant
                          content: The capital of France is Paris.
                        finish_reason: stop
                    usage:
                      prompt_tokens: 12
                      completion_tokens: 7
                      total_tokens: 19
            text/event-stream:
              schema:
                type: string
                description: >
                  Server-sent events stream when `stream: true`. Each event is a
                  JSON-encoded ChatCompletionChunk with a `choices[].delta`
                  payload, terminated by `data: [DONE]`.
        '400':
          description: Bad Request — invalid model, parameters, or message structure
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '401':
          description: Unauthorized — missing or invalid Bearer token
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '402':
          description: Payment Required — account balance exhausted
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '429':
          description: Too Many Requests — rate limit exceeded
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '500':
          description: Internal Server Error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'

components:
  securitySchemes:
    BearerAuth:
      type: http
      scheme: bearer
      bearerFormat: API Key
      description: >
        Hyperbolic API key issued at https://app.hyperbolic.ai/settings/api-keys.
        Pass as `Authorization: Bearer <YOUR_API_KEY>`.

  schemas:
    ChatCompletionRequest:
      type: object
      required:
        - model
        - messages
      properties:
        model:
          type: string
          description: >
            Hyperbolic model identifier — see GET /v1/models for the live
            catalog. Examples: `meta-llama/Meta-Llama-3.1-405B-Instruct`,
            `meta-llama/Meta-Llama-3.1-70B-Instruct`, `deepseek-ai/DeepSeek-V3`,
            `deepseek-ai/DeepSeek-R1`, `Qwen/Qwen2.5-72B-Instruct`,
            `NousResearch/Hermes-3-Llama-3.1-70B`, `mistralai/Mistral-7B-Instruct`,
            `meta-llama/Llama-3.2-90B-Vision-Instruct`.
        messages:
          type: array
          minItems: 1
          items:
            $ref: '#/components/schemas/ChatMessage'
        max_tokens:
          type: integer
          minimum: 1
          description: Maximum number of tokens to generate. Defaults vary by model.
        temperature:
          type: number
          minimum: 0
          maximum: 2
          default: 1
        top_p:
          type: number
          minimum: 0
          maximum: 1
          default: 1
        top_k:
          type: integer
          minimum: 0
        n:
          type: integer
          minimum: 1
          default: 1
          description: Number of completions to generate.
        stream:
          type: boolean
          default: false
          description: Stream partial deltas as Server-Sent Events.
        stop:
          oneOf:
            - type: string
            - type: array
              items:
                type: string
          description: Stop sequence(s) — up to 4.
        presence_penalty:
          type: number
          minimum: -2
          maximum: 2
        frequency_penalty:
          type: number
          minimum: -2
          maximum: 2
        seed:
          type: integer
          description: Best-effort deterministic seed.
        response_format:
          type: object
          description: 'Structured-output specification (e.g. { "type": "json_object" }).'
          properties:
            type:
              type: string
              enum:
                - text
                - json_object
                - json_schema
        tools:
          type: array
          items:
            $ref: '#/components/schemas/Tool'
          description: Function/tool catalog for OpenAI-compatible tool calling.
        tool_choice:
          oneOf:
            - type: string
              enum:
                - none
                - auto
                - required
            - type: object
        user:
          type: string
          description: End-user identifier for abuse monitoring.

    ChatMessage:
      type: object
      required:
        - role
        - content
      properties:
        role:
          type: string
          enum:
            - system
            - user
            - assistant
            - tool
        content:
          oneOf:
            - type: string
            - type: array
              items:
                $ref: '#/components/schemas/ContentPart'
        name:
          type: string
        tool_call_id:
          type: string
        tool_calls:
          type: array
          items:
            $ref: '#/components/schemas/ToolCall'

    ContentPart:
      type: object
      required:
        - type
      properties:
        type:
          type: string
          enum:
            - text
            - image_url
        text:
          type: string
        image_url:
          type: object
          properties:
            url:
              type: string
              description: Public URL or `data:` URI for image input on vision models.
            detail:
              type: string
              enum:
                - auto
                - low
                - high

    Tool:
      type: object
      required:
        - type
        - function
      properties:
        type:
          type: string
          enum:
            - function
        function:
          type: object
          required:
            - name
          properties:
            name:
              type: string
            description:
              type: string
            parameters:
              type: object
              description: JSON Schema describing the function arguments.

    ToolCall:
      type: object
      required:
        - id
        - type
        - function
      properties:
        id:
          type: string
        type:
          type: string
          enum:
            - function
        function:
          type: object
          properties:
            name:
              type: string
            arguments:
              type: string
              description: JSON-encoded argument string.

    ChatCompletionResponse:
      type: object
      required:
        - id
        - object
        - created
        - model
        - choices
      properties:
        id:
          type: string
        object:
          type: string
          enum:
            - chat.completion
        created:
          type: integer
          description: Unix epoch seconds.
        model:
          type: string
        choices:
          type: array
          items:
            $ref: '#/components/schemas/ChatCompletionChoice'
        usage:
          $ref: '#/components/schemas/Usage'
        system_fingerprint:
          type: string

    ChatCompletionChoice:
      type: object
      properties:
        index:
          type: integer
        message:
          $ref: '#/components/schemas/ChatMessage'
        finish_reason:
          type: string
          enum:
            - stop
            - length
            - tool_calls
            - content_filter

    Usage:
      type: object
      properties:
        prompt_tokens:
          type: integer
        completion_tokens:
          type: integer
        total_tokens:
          type: integer

    ErrorResponse:
      type: object
      properties:
        error:
          type: object
          properties:
            message:
              type: string
            type:
              type: string
            code:
              type: string
            param:
              type: string