Claude Sonnet 4.6 Thinking API

Input / 1M tokens$2.64~~$3.00~~

Output / 1M tokens$13.20~~$15.00~~

LLMAnthropic12% below officialReasoningAnthropic API

Loading playground…

About Claude Sonnet 4.6 Thinking

Claude Sonnet 4.6 Thinking by Anthropic is available on API Many from $2.64 per million input tokens and $13.20 per million output tokens, and you call it with the same API key you use for every other model.

It accepts OpenAI-style chat requests with streaming and tools.

Claude models also speak the Anthropic Messages API at /v1/messages, so the official Anthropic SDK works by changing only the base URL.

You pay only for successful results: failed or rejected requests are refunded automatically, and every call is recorded in your console with its exact cost.

Related models

New−12%

Claude Sonnet 5.5claude-sonnet-5-5

LLMAnthropic1M contextPrompt caching

$1.76 in · $8.80 outTry it

−12%

Claude Sonnet 4.5 (2025-09-29)claude-sonnet-4-5-20250929

LLMAnthropic128K contextPrompt caching

$2.64 in · $13.20 outTry it

−12%

Claude Sonnet 4.5 (2025-09-29) Thinkingclaude-sonnet-4-5-20250929-thinking

LLMAnthropicReasoningAnthropic API

$2.64 in · $13.20 outTry it

−12%

Claude Sonnet 4.6claude-sonnet-4-6

LLMAnthropic128K contextPrompt caching

$2.64 in · $13.20 outTry it

−12%

Claude Sonnet 5claude-sonnet-5

LLMAnthropic1M contextPrompt caching

$1.76 in · $8.80 outTry it

New−12%

Claude Opus 5.5claude-opus-5-5

LLMAnthropic128K contextPrompt caching

$3.52 in · $17.60 outTry it

New−12%

Claude Haiku 5.5claude-haiku-5-5

LLMAnthropic1M contextPrompt caching

$0.088 in · $0.44 outTry it

−12%

Claude Fable 5claude-fable-5

LLMAnthropic1M contextPrompt caching

$8.80 in · $44.00 outTry it

Frequently asked questions

How much does the Claude Sonnet 4.6 Thinking API cost?

Claude Sonnet 4.6 Thinking starts at $2.64 per million input tokens and $13.20 per million output tokens on API Many. The price table on this page lists every tier; you are charged only for successful requests.

How do I call Claude Sonnet 4.6 Thinking?

Create an API key in the console, then send a request to /v1/chat/completions with "model": "claude-sonnet-4-6-thinking". The API tab has copy-ready examples in cURL, Python and Node.js.

Is this the official Claude Sonnet 4.6 Thinking model?

Yes. Requests are forwarded to the model maker or an authorized channel with the same parameters, so the output matches the official API.

What happens if a request fails?

Failed, rejected or timed-out requests are not charged. Reserved balance is released automatically and the reason is shown in the call record.