Create a message (Anthropic shape)

Server URLloading...

POST

/anthropic/v1/messages

Send

Authorization

Body

Anthropic-compatible Messages endpoint. Internally translates to the upstream OpenAI-compatible inference path.

Streaming. When stream: true is set, the response content type switches to text/event-stream and Anthropic-shaped events are emitted. Event types:

• message_start — message envelope with id, model, role, usage.
• content_block_start — start of a content block (text, tool_use, thinking).
• content_block_delta — incremental content (text delta, input_json_delta, thinking_delta).
• content_block_stop — end of a content block.
• message_delta — running stop_reason / usage updates.
• message_stop — terminal event.
• ping — keep-alive.
• error — terminal error event (see error type mapping below).

Model ID aliasing. Slashes in upstream model IDs are aliased with -- — pass anthropic--claude-3-5-sonnet to target anthropic/claude-3-5-sonnet.

Error response shape. All non-2xx responses use { type: "error", error: { type, message } }. Status → error.type mapping:

Response Body

curl -X POST "https://example.com/anthropic/v1/messages" \  -H "Content-Type: application/json" \  -d '{    "model": "string",    "messages": [      {}    ],    "max_tokens": 0  }'

{
  "id": "string",
  "type": "message",
  "role": "assistant",
  "content": [
    {}
  ],
  "model": "string",
  "stop_reason": null,
  "stop_sequence": null,
  "usage": {
    "input_tokens": 0,
    "output_tokens": 0
  }
}

{
  "type": "error",
  "error": {
    "type": "invalid_request_error",
    "message": "string"
  }
}

{
  "type": "error",
  "error": {
    "type": "invalid_request_error",
    "message": "string"
  }
}

{
  "type": "error",
  "error": {
    "type": "invalid_request_error",
    "message": "string"
  }
}

{
  "type": "error",
  "error": {
    "type": "invalid_request_error",
    "message": "string"
  }
}

{
  "type": "error",
  "error": {
    "type": "invalid_request_error",
    "message": "string"
  }
}

{
  "type": "error",
  "error": {
    "type": "invalid_request_error",
    "message": "string"
  }
}