> ## Documentation Index
> Fetch the complete documentation index at: https://nusabase-a8dcf793.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Create Claude Message

> Request in the Anthropic Claude Messages API format. The `anthropic-version` header is required.



## OpenAPI

````yaml /en/openapi/relay-api.mintlify.json post /v1/messages
openapi: 3.0.1
info:
  title: AI Relay API
  description: >-
    Unified AI Model API supporting OpenAI, Claude, Gemini, Kling, Jimeng and
    other formats
  version: 1.0.0
  license:
    name: Proprietary
    url: https://example.com/license
servers:
  - url: https://api.nusabasedigital.com
    description: API Base URL
security:
  - BearerAuth: []
tags:
  - name: Models
    description: Models endpoints
  - name: Chat
    description: Chat endpoints
  - name: Responses
    description: Responses endpoints
  - name: Realtime
    description: Realtime endpoints
  - name: Claude
    description: Claude endpoints
  - name: Gemini
    description: Gemini endpoints
  - name: Images
    description: Images endpoints
  - name: Video
    description: Video endpoints
  - name: Video / Kling
    description: Video / Kling endpoints
  - name: Video / Jimeng
    description: Video / Jimeng endpoints
  - name: Audio
    description: Audio endpoints
  - name: Embeddings
    description: Embeddings endpoints
  - name: Rerank
    description: Rerank endpoints
  - name: Moderations
    description: Moderations endpoints
  - name: Not Implemented
    description: Not Implemented endpoints
paths:
  /v1/messages:
    post:
      tags:
        - Claude
      summary: Create Claude Message
      description: >-
        Request in the Anthropic Claude Messages API format. The
        `anthropic-version` header is required.
      operationId: post_v1_messages
      parameters:
        - name: anthropic-version
          in: header
          description: Anthropic API version
          required: true
          schema:
            type: string
        - name: x-api-key
          in: header
          description: Anthropic API Key (optional; a Bearer Token may also be used)
          required: false
          schema:
            type: string
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/ClaudeRequest'
      responses:
        '200':
          description: Response created successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ClaudeResponse'
          headers: {}
        '400':
          description: Invalid request parameters
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
      deprecated: false
      security:
        - BearerAuth: []
components:
  schemas:
    ClaudeRequest:
      type: object
      required:
        - model
        - messages
        - max_tokens
      properties:
        model:
          type: string
          example: claude-3-opus-20240229
        messages:
          type: array
          items:
            $ref: '#/components/schemas/ClaudeMessage'
        system:
          oneOf:
            - type: string
            - type: array
              items:
                type: object
                properties: {}
        max_tokens:
          type: integer
          minimum: 1
        temperature:
          type: number
          minimum: 0
          maximum: 1
        top_p:
          type: number
        top_k:
          type: integer
        stream:
          type: boolean
        stop_sequences:
          type: array
          items:
            type: string
        tools:
          type: array
          items:
            type: object
            properties:
              name:
                type: string
              description:
                type: string
              input_schema:
                type: object
                properties: {}
        tool_choice:
          oneOf:
            - type: object
              properties:
                type:
                  type: string
                  enum:
                    - auto
                    - any
                    - tool
                name:
                  type: string
        thinking:
          type: object
          properties:
            type:
              type: string
              enum:
                - enabled
                - disabled
            budget_tokens:
              type: integer
        metadata:
          type: object
          properties:
            user_id:
              type: string
        max_tokens_to_sample:
          type: integer
          minimum: 1
          description: >-
            Maximum number of generated tokens (legacy Claude field, equivalent
            to max_tokens)
        prompt:
          type: string
          description: Prompt (legacy Claude Completions format)
    ClaudeResponse:
      type: object
      properties:
        id:
          type: string
        type:
          type: string
          example: message
        role:
          type: string
          example: assistant
        content:
          type: array
          items:
            type: object
            properties:
              type:
                type: string
              text:
                type: string
        model:
          type: string
        stop_reason:
          type: string
          enum:
            - end_turn
            - max_tokens
            - stop_sequence
            - tool_use
        usage:
          type: object
          properties:
            input_tokens:
              type: integer
            output_tokens:
              type: integer
            cache_creation_input_tokens:
              type: integer
            cache_read_input_tokens:
              type: integer
    ErrorResponse:
      type: object
      properties:
        error:
          type: object
          properties:
            message:
              type: string
              description: Error profile
            type:
              type: string
              description: Error type
            param:
              type: string
              description: Related parameter
              nullable: true
            code:
              type: string
              description: Error code
              nullable: true
    ClaudeMessage:
      type: object
      required:
        - role
        - content
      properties:
        role:
          type: string
          enum:
            - user
            - assistant
        content:
          oneOf:
            - type: string
            - type: array
              items:
                type: object
                properties:
                  type:
                    type: string
                    enum:
                      - text
                      - image
                      - tool_use
                      - tool_result
                  text:
                    type: string
                  source:
                    type: object
                    properties:
                      type:
                        type: string
                        enum:
                          - base64
                          - url
                      media_type:
                        type: string
                      data:
                        type: string
                      url:
                        type: string
                  id:
                    type: string
                  name:
                    type: string
                  input:
                    type: object
                    properties: {}
                  tool_use_id:
                    type: string
                  content:
                    type: string
  securitySchemes:
    BearerAuth:
      type: http
      scheme: bearer
      bearerFormat: JWT

````

This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.