Claude Sonnet 4.6 (Thinking)
claude-sonnet-4-6-thinkingClaude Sonnet 4.6 with extended thinking capability for complex reasoning tasks.
Extended Thinking
Advanced reasoning mode
Best Performance
Top-tier capabilities
Deep Reasoning
Solve complex problems
Latest Features
Most recent capabilities
API Documentation
View complete API reference with all parameters and examples.
Advanced Features
Streaming
Enable real-time streaming responses with Server-Sent Events.
{
"model": "claude-sonnet-4-6-thinking",
"stream": true,
"max_tokens": 1024,
"messages": [...]
}Function Calling (Tools)
Enable Claude to use tools and call functions.
{
"model": "claude-sonnet-4-6-thinking",
"max_tokens": 1024,
"tools": [{
"name": "get_weather",
"description": "Get current weather for a location",
"input_schema": {
"type": "object",
"properties": {
"location": {"type": "string", "description": "City name"}
},
"required": ["location"]
}
}],
"tool_choice": {"type": "auto"},
"messages": [{"role": "user", "content": "What's the weather in Tokyo?"}]
}PDF Support
Analyze PDF documents by sending them as base64 encoded content.
{
"model": "claude-sonnet-4-6-thinking",
"max_tokens": 1024,
"messages": [{
"role": "user",
"content": [{
"type": "document",
"source": {
"type": "base64",
"media_type": "application/pdf",
"data": "<base64_encoded_pdf>"
}
}, {
"type": "text",
"text": "Summarize this document."
}]
}]
}Structured Output (JSON Schema)
Get structured JSON responses that match your schema.
{
"model": "claude-sonnet-4-6-thinking",
"max_tokens": 1024,
"output_format": {
"type": "json_schema",
"schema": {
"type": "object",
"properties": {
"name": {"type": "string"},
"age": {"type": "integer"}
},
"required": ["name", "age"]
}
},
"messages": [{"role": "user", "content": "Extract info: John is 30 years old"}]
}Web Search
Enable Claude to search the web for up-to-date information.
{
"model": "claude-sonnet-4-6-thinking",
"max_tokens": 1024,
"tools": [{
"type": "web_search_20250305",
"name": "web_search",
"max_uses": 5
}],
"messages": [{"role": "user", "content": "What's the latest news about AI?"}]
}API Parameters Reference
| Parameter | Type | Required | Description |
|---|---|---|---|
| model | string | Yes | Model identifier (e.g., claude-sonnet-4-6-thinking) |
| messages | array | Yes | Array of message objects with role and content |
| max_tokens | integer | Yes | Maximum tokens in the response (1 - 128000) |
| system | string | No | System prompt to set context |
| stream | boolean | No | Enable streaming responses (SSE) |
| temperature | number | No | Sampling temperature (0.0 - 1.0) |
| top_p | number | No | Nucleus sampling threshold (0.0 - 1.0) |
| top_k | integer | No | Top-k sampling (0 - infinity) |
| stop_sequences | array | No | Sequences that stop generation |
| tools | array | No | Function calling tools definition |
| tool_choice | object | No | Tool selection strategy (auto/any/tool) |
| thinking | object | No | Enable extended thinking mode |
| output_format | object | No | Structured output with JSON schema |
Full API Documentation
View complete API reference with streaming, thinking, and more.
Pricing
Billing: Cost = (input_tokens * input_price + output_tokens * output_price) / 1,000,000
About Claude Sonnet 4.6 (Thinking)
Claude Sonnet 4.6 (Thinking) is a Large Language Model API provided by Anthropic. Claude Sonnet 4.6 with extended thinking capability for complex reasoning tasks. Through API Models platform, you can access this model via a unified API at prices significantly lower than official rates. Current pricing: Input: $1.059, Output: $5.295 per 1M tokens.
Key Features
- Extended Thinking -- Advanced reasoning mode
- Best Performance -- Top-tier capabilities
- Deep Reasoning -- Solve complex problems
- Latest Features -- Most recent capabilities
Use Cases
Chatbot & Customer Support
Build intelligent conversational systems to automatically answer user queries and improve service efficiency.
Content Generation
Automatically write articles, emails, ad copy, and other text content to boost productivity.
Code Assistant
Assist with code writing, debugging, and code review to accelerate software development.
Data Analysis
Understand and analyze unstructured data, extract key insights, and generate summary reports.
Why API Models
- Unified API -- One API key to access all models, no need to register on multiple platforms
- Cost Savings -- 60-95% cheaper than official pricing, ideal for indie developers and startups
- Instant Access -- Start using immediately after signup, supports Stripe and Alipay payments
- Full Documentation -- Detailed API docs with code examples in cURL, Python, and Node.js
Frequently Asked Questions
How much does Claude Sonnet 4.6 (Thinking) cost?
Claude Sonnet 4.6 (Thinking) is available through API Models at: Input: $1.059, Output: $5.295 per 1M tokens. This is up to 95% cheaper than official pricing.
How to use Claude Sonnet 4.6 (Thinking) API?
Sign up at API Models, get your API key, and call our unified API endpoint. We provide detailed API documentation with code examples in cURL, Python, and Node.js.
What is the difference between API Models and the official Anthropic API?
API Models offers the same Claude Sonnet 4.6 (Thinking) model at 60-95% lower cost through our aggregation platform. We provide a unified API interface so you do not need separate accounts for each provider - one API key to access all models.
What payment methods are supported?
We support Stripe (Visa, Mastercard, and other international cards) and Alipay. Credits are available instantly after payment.