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消息 API

一等入站 Anthropic Messages 协议(anthropic_messages)。协议所有者: Anthropic。Chat Completions、Responses 与 FIM 为独立入站路由 — 见 API 概览。

POST /v1/messages​

发送消息到 LLM,兼容 Anthropic Claude API 格式。

请求格式​

curl -X POST http://localhost:3456/v1/messages \
-H "x-api-key: your-api-key" \
-H "content-type: application/json" \
-d '{
"model": "claude-3-5-sonnet-20241022",
"max_tokens": 1024,
"messages": [
{
"role": "user",
"content": "Hello, Claude!"
}
]
}'

请求参数​

参数类型必需说明
modelstring是模型名称(会被路由到实际提供商)
messagesarray是消息数组
max_tokensinteger是最大生成 Token 数
systemstring否系统提示词
toolsarray否可用工具列表
streamboolean否是否使用流式响应(默认 false)
temperaturenumber否温度参数(0-1)

消息对象格式​

{
"role": "user|assistant",
"content": "string | array"
}

响应格式(非流式)​

{
"id": "msg_xxx",
"type": "message",
"role": "assistant",
"content": [
{
"type": "text",
"text": "Hello! How can I help you today?"
}
],
"model": "claude-3-5-sonnet-20241022",
"stop_reason": "end_turn",
"usage": {
"input_tokens": 10,
"output_tokens": 20
}
}

流式响应​

设置 stream: true 启用流式响应:

{
"model": "claude-3-5-sonnet-20241022",
"max_tokens": 1024,
"messages": [...],
"stream": true
}

流式响应事件类型:

  • message_start - 消息开始
  • content_block_start - 内容块开始
  • content_block_delta - 内容增量
  • content_block_stop - 内容块结束
  • message_delta - 消息元数据(usage)
  • message_stop - 消息结束

工具使用​

支持函数调用(Tool Use):

{
"model": "claude-3-5-sonnet-20241022",
"max_tokens": 1024,
"messages": [
{
"role": "user",
"content": "What's the weather like?"
}
],
"tools": [
{
"name": "get_weather",
"description": "Get the current weather",
"input_schema": {
"type": "object",
"properties": {
"location": {
"type": "string",
"description": "City name"
}
},
"required": ["location"]
}
}
]
}

多模态支持​

支持图片输入:

{
"role": "user",
"content": [
{
"type": "image",
"source": {
"type": "base64",
"media_type": "image/png",
"data": "iVBORw0KGgo..."
}
},
{
"type": "text",
"text": "Describe this image"
}
]
}

POST /v1/messages/count_tokens​

计算消息的 Token 数量。

请求格式​

curl -X POST http://localhost:3456/v1/messages/count_tokens \
-H "x-api-key: your-api-key" \
-H "content-type: application/json" \
-d '{
"model": "claude-3-5-sonnet-20241022",
"messages": [
{
"role": "user",
"content": "Hello!"
}
],
"tools": [],
"system": "You are a helpful assistant."
}'

请求参数​

参数类型必需说明
modelstring是模型名称
messagesarray是消息数组
toolsarray否工具列表
systemstring否系统提示词

响应格式​

{
"input_tokens": 42
}

错误响应​

400 Bad Request​

{
"error": {
"type": "invalid_request_error",
"message": "messages is required"
}
}

401 Unauthorized​

{
"error": {
"type": "authentication_error",
"message": "Invalid API key"
}
}

500 Internal Server Error​

{
"error": {
"type": "api_error",
"message": "Failed to connect to provider"
}
}