Claude Sonnet 4.6

by Anthropic

Claude Sonnet 4.6 is a model from Anthropic, released on February 17, 2026. It has a 1M-token context window and can generate up to 64K output tokens. API pricing is $3 per 1M input tokens and $15 per 1M output tokens.

Claude Sonnet 4.6 is a full upgrade of the model's skills across coding, computer use, long-context reasoning, agent planning, knowledge work, and design. Users preferred Sonnet 4.6 over Sonnet 4.5 approximately 70% of the time. First Sonnet-class model with 1M token context window (beta) and context compaction. Major improvement in computer use skills compared to prior Sonnet models. Default model on Free and Pro plans. Pricing: $3/$15 per million tokens (input/output).

Key specs

ProviderAnthropic
Release date2026-02-17
Licenseproprietary
Context window1M tokens
Max output64K tokens
Input price$3 / 1M tokens
Output price$15 / 1M tokens
Intelligence Score36.7
Coding index25

Quick answers

What is the context window of Claude Sonnet 4.6?

Claude Sonnet 4.6 has a context window of 1M tokens, with a maximum output of 64K tokens per response.

How much does Claude Sonnet 4.6 cost?

Claude Sonnet 4.6 costs $3 per 1M input tokens and $15 per 1M output tokens through the API.

Is Claude Sonnet 4.6 open source?

No. Claude Sonnet 4.6 is a proprietary model from Anthropic (proprietary license).

When was Claude Sonnet 4.6 released?

Anthropic released Claude Sonnet 4.6 on February 17, 2026.

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