Claude Messages API - MountSea API

💡 About

此接口兼容 Anthropic Messages API 格式，适用于：

Claude Code CLI 工具直接接入
Anthropic SDK（Python / TypeScript）调用
任何支持 Anthropic API 格式的客户端

Base URL: https://api.mountsea.ai/chat/claude，与 OpenAI 兼容 API 的 Base URL 不同，请注意区分。

🤖 Claude Code 配置

设置以下环境变量即可让 Claude Code 使用我们的 API：

export ANTHROPIC_API_KEY="your-api-key"
export ANTHROPIC_BASE_URL="https://api.mountsea.ai/chat/claude"
claude

💡 Quick Examples

Python
Node.js
cURL

import anthropic

client = anthropic.Anthropic(
    api_key="your-api-key",
    base_url="https://api.mountsea.ai/chat/claude"
)

# Basic message
message = client.messages.create(
    model="claude-sonnet-4-6",
    max_tokens=4096,
    system="You are a helpful assistant.",
    messages=[
        {"role": "user", "content": "Hello, Claude!"}
    ]
)

print(message.content[0].text)

Streaming:

with client.messages.stream(
    model="claude-sonnet-4-6",
    max_tokens=4096,
    messages=[{"role": "user", "content": "Tell me a story"}]
) as stream:
    for text in stream.text_stream:
        print(text, end="")

Install:

pip install anthropic

import Anthropic from '@anthropic-ai/sdk';

const client = new Anthropic({
    apiKey: 'your-api-key',
    baseURL: 'https://api.mountsea.ai/chat/claude'
});

// Basic message
const message = await client.messages.create({
    model: 'claude-sonnet-4-6',
    max_tokens: 4096,
    system: 'You are a helpful assistant.',
    messages: [
        { role: 'user', content: 'Hello, Claude!' }
    ]
});

console.log(message.content[0].text);

Streaming:

const stream = await client.messages.stream({
    model: 'claude-sonnet-4-6',
    max_tokens: 4096,
    messages: [{ role: 'user', content: 'Tell me a story' }]
});

for await (const event of stream) {
    if (event.type === 'content_block_delta' && event.delta.type === 'text_delta') {
        process.stdout.write(event.delta.text);
    }
}

Install:

npm install @anthropic-ai/sdk

# Non-streaming
curl https://api.mountsea.ai/chat/claude/v1/messages \
  -H "Content-Type: application/json" \
  -H "x-api-key: your-api-key" \
  -H "anthropic-version: 2023-06-01" \
  -d '{
    "model": "claude-sonnet-4-6",
    "max_tokens": 4096,
    "system": "You are a helpful assistant.",
    "messages": [
      {"role": "user", "content": "Hello, Claude!"}
    ]
  }'

# Streaming
curl https://api.mountsea.ai/chat/claude/v1/messages \
  -H "Content-Type: application/json" \
  -H "x-api-key: your-api-key" \
  -H "anthropic-version: 2023-06-01" \
  -d '{
    "model": "claude-sonnet-4-6",
    "max_tokens": 4096,
    "stream": true,
    "messages": [
      {"role": "user", "content": "Tell me a story"}
    ]
  }'

📤 Response Format

Non-streaming Response

{
  "id": "msg_xxx",
  "type": "message",
  "role": "assistant",
  "model": "claude-sonnet-4-6",
  "content": [
    {
      "type": "text",
      "text": "Hello! How can I help you today?"
    }
  ],
  "stop_reason": "end_turn",
  "usage": {
    "input_tokens": 25,
    "output_tokens": 10
  }
}

Streaming Response (SSE)

event: message_start
data: {"type":"message_start","message":{"id":"msg_xxx","type":"message","role":"assistant","model":"claude-sonnet-4-6"}}

event: content_block_start
data: {"type":"content_block_start","index":0,"content_block":{"type":"text","text":""}}

event: content_block_delta
data: {"type":"content_block_delta","index":0,"delta":{"type":"text_delta","text":"Hello"}}

event: content_block_delta
data: {"type":"content_block_delta","index":0,"delta":{"type":"text_delta","text":"!"}}

event: content_block_stop
data: {"type":"content_block_stop","index":0}

event: message_stop
data: {"type":"message_stop"}

🔧 Supported Models

We support the latest Claude models. This page does not repeat the other providers. The snapshot may be incomplete — call GET /chat/claude/v1/models for every Claude model that is enabled now. OpenAI, Gemini, and Grok are listed separately on List Models.

Model ID	Display name
`claude-fable-5`	Fable 5
`claude-fable-5-1`	Claude Fable 5.1
`claude-opus-5-5`	Claude Opus 5.5
`claude-opus-4-7`	Claude Opus 4.7
`claude-opus-4-6`	Claude Opus 4.6
`claude-sonnet-4-6`	Claude Sonnet 4.6
`claude-haiku-4-5-20251001`	Claude Haiku 4.5 (2025-10-01)
`claude-4.5`	Claude 4.5 (alias)
`claude-opus-4-8`	claude-opus-4-8
`claude-sonnet-5`	claude-sonnet-5
`claude-opus-5`	Opus 5
`claude-sonnet-5-5`	Claude Sonnet 5.5

🔧 API Reference

The interactive API form below is auto-generated from OpenAPI spec.

​💡 About

​🤖 Claude Code 配置

​💡 Quick Examples

​📤 Response Format

​Non-streaming Response

​Streaming Response (SSE)

​🔧 Supported Models

​🔧 API Reference

💡 About

🤖 Claude Code 配置

💡 Quick Examples

📤 Response Format

Non-streaming Response

Streaming Response (SSE)

🔧 Supported Models

🔧 API Reference