> ## Documentation Index
> Fetch the complete documentation index at: https://phaseo.app/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Rerank documents

> Rank documents by relevance to a query with a supported reranking model.

Use this endpoint to reorder candidate documents before they are passed to a search, retrieval, or generation step.

Verify the model in `GET /v1/models` before deployment. The default response contains only models with a public Gateway route.


## OpenAPI

````yaml POST /rerank
openapi: 3.0.3
info:
  title: Phaseo Gateway API
  description: >-
    A gateway API for accessing various AI models with OpenAI-compatible
    endpoints.
  version: 1.0.0
  contact:
    name: Phaseo
    url: https://phaseo.app
    email: danielbutler500@gmail.com
servers:
  - url: https://api.phaseo.app/v1
security:
  - BearerAuth: []
tags:
  - name: Gateway
    description: Core Phaseo Gateway operations.
paths:
  /rerank:
    post:
      tags:
        - Gateway
      summary: Rerank documents
      description: Reranks a list of documents against a query.
      operationId: createRerank
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/RerankRequest'
      responses:
        '200':
          description: Rerank response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/RerankResponse'
components:
  schemas:
    RerankRequest:
      type: object
      required:
        - model
        - query
        - documents
      properties:
        model:
          type: string
        query:
          type: string
        documents:
          oneOf:
            - type: array
              minItems: 1
              items:
                type: string
            - type: array
              minItems: 1
              items:
                type: object
                additionalProperties: true
        top_n:
          type: integer
          minimum: 1
        top_k:
          type: integer
          minimum: 1
          description: Alias for top_n.
        return_documents:
          type: boolean
        max_chunks_per_doc:
          type: integer
          minimum: 1
        rank_fields:
          type: array
          items:
            type: string
        user:
          type: string
        metadata:
          type: object
          additionalProperties:
            type: string
        provider_options:
          type: object
          additionalProperties: true
        debug:
          $ref: '#/components/schemas/DebugOptions'
        provider:
          $ref: '#/components/schemas/ProviderRoutingOptions'
    RerankResponse:
      type: object
      properties:
        object:
          type: string
        id:
          type: string
        nativeResponseId:
          type: string
          nullable: true
        model:
          type: string
        results:
          type: array
          items:
            $ref: '#/components/schemas/RerankResult'
        usage:
          $ref: '#/components/schemas/Usage'
    DebugOptions:
      type: object
      description: Gateway debug controls. These flags are never forwarded upstream.
      properties:
        enabled:
          type: boolean
        return_upstream_request:
          type: boolean
        return_upstream_response:
          type: boolean
        trace:
          type: boolean
        trace_level:
          type: string
          enum:
            - summary
            - full
    ProviderRoutingOptions:
      type: object
      description: Provider routing preferences for gateway selection.
      properties:
        order:
          type: array
          items:
            type: string
        only:
          type: array
          items:
            type: string
        ignore:
          type: array
          items:
            type: string
        include_alpha:
          type: boolean
          description: Include alpha providers in routing (off by default).
        allow_fallbacks:
          type: boolean
          nullable: true
          description: Allow fallback to another eligible provider after failure.
        require_parameters:
          type: boolean
          nullable: true
          description: Require provider support for requested parameters before routing.
        required_execution_region:
          type: string
          nullable: true
          description: Restrict routing to providers with the requested execution region.
        required_data_region:
          type: string
          nullable: true
          description: Restrict routing to providers with the requested data region.
        require_zero_data_retention:
          type: boolean
          nullable: true
          description: Restrict routing to providers that support zero data retention.
        data_collection:
          type: string
          nullable: true
          enum:
            - allow
            - deny
        zdr:
          type: boolean
          nullable: true
        enforce_distillable_text:
          type: boolean
          nullable: true
        quantizations:
          type: array
          nullable: true
          items:
            type: string
        sort:
          oneOf:
            - type: string
            - type: object
              additionalProperties: true
          description: >-
            Rank providers for this request, for example by price, latency, or
            throughput.
        max_price:
          type: object
          properties:
            prompt:
              oneOf:
                - type: number
                - type: string
            completion:
              oneOf:
                - type: number
                - type: string
            image:
              oneOf:
                - type: number
                - type: string
            audio:
              oneOf:
                - type: number
                - type: string
            request:
              oneOf:
                - type: number
                - type: string
        preferred_min_throughput:
          oneOf:
            - type: number
            - type: object
              additionalProperties:
                type: number
        preferred_max_latency:
          oneOf:
            - type: number
            - type: object
              additionalProperties:
                type: number
    RerankResult:
      type: object
      properties:
        index:
          type: integer
        relevance_score:
          type: number
        document:
          $ref: '#/components/schemas/RerankDocument'
    Usage:
      type: object
      properties:
        prompt_tokens:
          type: integer
        completion_tokens:
          type: integer
        total_tokens:
          type: integer
        server_tool_use:
          $ref: '#/components/schemas/ServerToolUsage'
    RerankDocument:
      oneOf:
        - type: string
        - type: object
          additionalProperties: true
    ServerToolUsage:
      type: object
      properties:
        datetime_requests:
          type: integer
          minimum: 0
        web_search_requests:
          type: integer
          minimum: 0
        subagent_requests:
          type: integer
          minimum: 0
        fusion_requests:
          type: integer
          minimum: 0
        search_models_requests:
          type: integer
          minimum: 0
        web_fetch_requests:
          type: integer
          minimum: 0
        advisor_requests:
          type: integer
          minimum: 0
        image_generation_requests:
          type: integer
          minimum: 0
        apply_patch_requests:
          type: integer
          minimum: 0
      additionalProperties: false
  securitySchemes:
    BearerAuth:
      type: http
      scheme: bearer
      description: Bearer token authentication

````