Exa Answer API

openapi: 3.1.0
info:
  title: Exa Search Answer API
  description: 'Neural web search API for AI agents. Endpoints and parameters derived from the Exa API reference at https://exa.ai/docs/reference. Covers /search, /contents, /findSimilar, and /answer. Authenticate with an API key via the x-api-key header or Authorization: Bearer.'
  version: 1.0.0
  contact:
    name: API Evangelist
    email: kin@apievangelist.com
  license:
    name: Proprietary
servers:
- url: https://api.exa.ai
  description: Exa production API
security:
- apiKeyHeader: []
- bearerAuth: []
tags:
- name: Answer
paths:
  /answer:
    post:
      summary: Get an LLM-grounded answer with citations
      description: Returns a direct answer (factual queries) or a detailed summary with citations (open-ended queries). Supports streaming with stream=true and structured output via outputSchema.
      operationId: answer
      tags:
      - Answer
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/AnswerRequest'
      responses:
        '200':
          description: Answer with sources
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/AnswerResponse'
            text/event-stream:
              schema:
                type: string
                description: Server-sent events when stream=true
components:
  schemas:
    AnswerResponse:
      type: object
      properties:
        answer:
          oneOf:
          - type: string
          - type: object
            additionalProperties: true
        citations:
          type: array
          items:
            $ref: '#/components/schemas/SearchResult'
        costDollars:
          type: object
          additionalProperties: true
    AnswerRequest:
      type: object
      required:
      - query
      properties:
        query:
          type: string
        stream:
          type: boolean
        outputSchema:
          type: object
          additionalProperties: true
        text:
          type: boolean
        model:
          type: string
          description: Model selector, e.g. exa or exa-pro
        systemPrompt:
          type: string
    SearchResult:
      type: object
      properties:
        id:
          type: string
        url:
          type: string
          format: uri
        title:
          type: string
        publishedDate:
          type: string
        author:
          type: string
        score:
          type: number
        text:
          type: string
        highlights:
          type: array
          items:
            type: string
        summary:
          type: string
  securitySchemes:
    apiKeyHeader:
      type: apiKey
      in: header
      name: x-api-key
    bearerAuth:
      type: http
      scheme: bearer