Parasail Chat API

openapi: 3.1.0
info:
  title: Parasail Batch Chat API
  description: 'OpenAI-compatible Batch API for offline, asynchronous inference workloads at 50% off

    serverless pricing (with cached tokens at an additional 30% off). Supports

    /v1/chat/completions and /v1/embeddings in the OpenAI Batch file format (JSONL).

    '
  version: '1.0'
  contact:
    name: Parasail
    url: https://docs.parasail.io/parasail-docs/
servers:
- url: https://api.parasail.io/v1
  description: Parasail Batch endpoint
security:
- bearerAuth: []
tags:
- name: Chat
  description: Chat completions for conversational LLM workloads.
paths:
  /chat/completions:
    post:
      tags:
      - Chat
      operationId: createChatCompletion
      summary: Create Chat Completion
      description: Generate a chat completion from a list of messages using an OpenAI-compatible request body.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/ChatCompletionRequest'
      responses:
        '200':
          description: A chat completion response.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ChatCompletionResponse'
            text/event-stream:
              schema:
                type: string
                description: Server-Sent Events stream when stream=true.
components:
  schemas:
    ChatCompletionRequest:
      type: object
      required:
      - model
      - messages
      properties:
        model:
          type: string
          description: ID of the model to use (e.g. parasail-deepseek-v3, parasail-qwen3-coder-480b).
        messages:
          type: array
          items:
            $ref: '#/components/schemas/ChatMessage'
        max_tokens:
          type: integer
        temperature:
          type: number
        top_p:
          type: number
        stream:
          type: boolean
          description: If true, response is returned as a Server-Sent Events stream.
        stop:
          oneOf:
          - type: string
          - type: array
            items:
              type: string
        tools:
          type: array
          items:
            type: object
        response_format:
          type: object
          description: JSON schema or json_object response format constraint.
    ChatCompletionResponse:
      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'
    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
    Usage:
      type: object
      properties:
        prompt_tokens:
          type: integer
        completion_tokens:
          type: integer
        total_tokens:
          type: integer
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: Send your Parasail API key as a Bearer token.