Claude format.

Anthropic Claude Messages API-compatible request. The `anthropic-version` header is required.

Header Parameters

anthropic-version*string

Anthropic API version.

x-api-key?string

Optional Anthropic-style API Key header; a Bearer Token may also be used.

Request Body

application/json

TypeScript Definitions

Use the request body type in TypeScript.

model*string

ID of the model to invoke.

messages*array<>

List of Claude conversation messages in order.

system?|array<>

System prompt, either a string or an array of content blocks.

max_tokens*integer

Maximum number of tokens allowed in the generated response.

temperature?number

Sampling temperature; higher values produce more random output.

top_p?number

Nucleus sampling parameter that controls the cumulative probability range of candidate tokens.

top_k?integer

Sample only from the top K most probable candidate tokens.

stream?boolean

Whether to return the response as a stream.

stop_sequences?array<string>

Stop generation when any of these strings is encountered.

tools?array<>

List of tool definitions available for the model to call.

tool_choice?|

Tool call strategy; can specify automatic selection or force a specific tool call.

thinking?

Claude reasoning/thinking configuration.

metadata?

Request metadata for business-side tracking or pass-through.

Response Body

`application/json`

curl -X POST "https://example.com/v1/messages" \  -H "anthropic-version: 2023-06-01" \  -H "Content-Type: application/json" \  -d '{    "model": "claude-sonnet-4-5-20250929",    "max_tokens": 1024,    "messages": [      {        "role": "user",        "content": "Hello, please introduce Models Hub in one sentence."      }    ]  }'

{
  "id": "msg_123",
  "type": "message",
  "role": "assistant",
  "content": [
    {
      "type": "text",
      "text": "string",
      "image_url": {},
      "inline_data": {}
    }
  ],
  "model": "string",
  "stop_reason": "string",
  "usage": {
    "prompt_tokens": 0,
    "completion_tokens": 0,
    "total_tokens": 0,
    "input_tokens": 0,
    "output_tokens": 0
  }
}

{
  "error": {
    "code": "string",
    "message": "string",
    "request_id": "string"
  }
}

{
  "error": {
    "code": "string",
    "message": "string",
    "request_id": "string"
  }
}

Header Parameters

Request Body

Response Body

200application/json

401application/json

429application/json

`application/json`

`application/json`

`application/json`