Messages (Anthropic)

Creates a model response using the Anthropic-compatible API format.

Endpoint


POST https://gateway.mytokengate.com/v1/messages

Request Example


curl --request POST \
  --url https://gateway.mytokengate.com/v1/messages \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
    "model": "claude-sonnet-4-6",
    "messages": [
      {
        "role": "user",
        "content": "What opportunities and challenges will the Chinese large model industry face in 2025?"
      }
    ],
    "max_tokens": 8192
  }'

Authentication

All requests require a Bearer token in the Authorization header:


Authorization: Bearer YOUR_API_KEY

Request Parameters

Parameter	Type	Required	Description
model	string	Yes	Model name. See Models for available options.
messages	array	Yes	A list of messages comprising the conversation
max_tokens	integer	Yes	Maximum tokens to generate
system	string or array	No	System prompt for context and instructions
stream	boolean	No	If true, returns Server-Sent Events
temperature	float	No	Controls randomness. Range: 0-2
top_p	float	No	Nucleus sampling. Range: 0.1-1
top_k	float	No	Top-k sampling. Range: 0-50
stop_sequences	array	No	Custom sequences that stop generation
tools	array	No	Tool definitions for function calling
tool_choice	object	No	How the model should use tools (auto, any, or specific tool)

Response


{
  "id": "msg_xxx",
  "type": "message",
  "role": "assistant",
  "content": [
    {
      "type": "text",
      "text": "The response text..."
    }
  ],
  "model": "claude-sonnet-4-6",
  "stop_reason": "end_turn",
  "stop_sequence": null,
  "usage": {
    "input_tokens": 2095,
    "output_tokens": 503
  }
}

Response Fields

Field	Type	Description
id	string	Message identifier
type	string	Always “message”
role	string	Always “assistant”
content	array	Array of content blocks (text, tool_use, etc.)
model	string	Model that handled the request
stop_reason	string	Reason for stopping: `end_turn`, `max_tokens`, `tool_use`, `refusal`
stop_sequence	string	Matched stop sequence, if any
usage	object	Token usage statistics

Error Codes

Code	Description
400	Invalid request parameters
401	Invalid or missing API key
404	Model not found
429	Rate limit exceeded
503/504	Service temporarily unavailable