Fastly

Fastly Chat Completions API

The Chat Completions API from Fastly — 2 operation(s) for chat completions.

Documentation GitHub OpenAPI

Operations 2

POST /openai/v1/chat/completions Create Chat Completion Via OpenAI #

POST /gemini/v1/models/{model}:generateContent Generate Content Via Google Gemini #

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OpenAPI Specification

openapi: 3.2.0
info:
  title: Fastly AI Accelerator Chat Completions API
  description: 'Fastly AI Accelerator is a semantic caching solution that boosts the

    performance of popular LLMs like OpenAI and Google Gemini by 9x. Semantic

    caching maps queries to concepts as vectors so the system can cache answers

    to similar questions regardless of exact wording. AI Accelerator exposes

    drop-in compatible chat completions endpoints that proxy to upstream

    providers while serving cached responses from the edge.

    '
  version: 1.0.0
servers:
- url: https://api.fastly.ai
  description: Fastly AI Accelerator edge endpoint
security:
- FastlyKey: []
tags:
- name: Chat Completions
paths:
  /openai/v1/chat/completions:
    post:
      tags:
      - Chat Completions
      summary: Create Chat Completion Via OpenAI
      description: OpenAI-compatible chat completion request, semantically cached at the Fastly edge.
      operationId: createOpenAiChatCompletion
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/ChatCompletionRequest'
      responses:
        '200':
          description: Chat completion response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ChatCompletionResponse'
  /gemini/v1/models/{model}:generateContent:
    parameters:
    - in: path
      name: model
      required: true
      schema:
        type: string
        example: gemini-1.5-pro
    post:
      tags:
      - Chat Completions
      summary: Generate Content Via Google Gemini
      operationId: generateGeminiContent
      responses:
        '200':
          description: Gemini response
components:
  schemas:
    ChatCompletionRequest:
      type: object
      required:
      - model
      - messages
      properties:
        model:
          type: string
          example: gpt-4o-mini
        messages:
          type: array
          items:
            type: object
            properties:
              role:
                type: string
                enum:
                - system
                - user
                - assistant
                - tool
              content:
                type: string
        temperature:
          type: number
          format: float
        max_tokens:
          type: integer
        stream:
          type: boolean
    ChatCompletionResponse:
      type: object
      properties:
        id:
          type: string
        object:
          type: string
        created:
          type: integer
        model:
          type: string
        choices:
          type: array
          items:
            type: object
            properties:
              index:
                type: integer
              message:
                type: object
                properties:
                  role:
                    type: string
                  content:
                    type: string
              finish_reason:
                type: string
        usage:
          type: object
          properties:
            prompt_tokens:
              type: integer
            completion_tokens:
              type: integer
            total_tokens:
              type: integer
        x_fastly_cache:
          type: object
          description: Fastly semantic cache metadata
          properties:
            status:
              type: string
              enum:
              - HIT
              - MISS
              - SIMILAR
            similarity:
              type: number
              format: float
  securitySchemes:
    FastlyKey:
      type: apiKey
      in: header
      name: Fastly-Key