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OpenAPI Specification

openapi: 3.2.0
info:
  title: Voyage AI Rerank API
  version: 1.0.0
  summary: Embeddings, multimodal embeddings, contextualized embeddings, and reranking from Voyage AI.
  description: 'OpenAI-compatible REST API for Voyage AI embedding and reranker models used in

    retrieval-augmented generation (RAG) and semantic search workflows.


    Documentation: https://docs.voyageai.com/reference/embeddings-api

    '
  contact:
    name: Voyage AI Docs
    url: https://docs.voyageai.com/
servers:
- url: https://api.voyageai.com/v1
  description: Voyage AI production API
security:
- bearerAuth: []
tags:
- name: Rerank
  description: Cross-encoder reranking of candidate documents.
paths:
  /rerank:
    post:
      tags:
      - Rerank
      summary: Rerank documents against a query
      operationId: rerank
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/RerankRequest'
      responses:
        '200':
          description: Reranked results
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/RerankResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
components:
  schemas:
    RerankRequest:
      type: object
      required:
      - query
      - documents
      - model
      properties:
        query:
          type: string
        documents:
          type: array
          items:
            type: string
          maxItems: 1000
        model:
          type: string
          examples:
          - rerank-2.5
          - rerank-2.5-lite
          - voyage-rerank-2
        top_k:
          type: integer
          minimum: 1
        return_documents:
          type: boolean
          default: false
        truncation:
          type: boolean
          default: true
    Error:
      type: object
      properties:
        detail:
          type: string
    RerankResponse:
      type: object
      properties:
        object:
          type: string
          examples:
          - list
        data:
          type: array
          items:
            type: object
            properties:
              index:
                type: integer
              relevance_score:
                type: number
              document:
                type: string
        model:
          type: string
        usage:
          $ref: '#/components/schemas/Usage'
    Usage:
      type: object
      properties:
        total_tokens:
          type: integer
  responses:
    Unauthorized:
      description: Missing or invalid API key
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      bearerFormat: API key
      description: 'Voyage AI API key sent as `Authorization: Bearer <key>`.'