Claude Sonnet 5.5

Name: Claude Sonnet 5.5
Price: 2 USD
Author: Anthropic

Anthropic🇺🇸 United States

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Context window1000K tokens

Input / 1M tokens$2

Output / 1M tokens$10

Version History

5.5minorSeptember 28, 2026

Sonnet 5.5 replaces Sonnet 5, with Anthropic claiming 30% faster performance, lower token costs, and cyber capabilities now comparable to Opus 5, triggering the same cyber safeguards applied to Opus and Fable.

Coverage

model releaseAnthropic

Anthropic Launches Claude Sonnet 5.5, Claims 30% Faster Performance at Lower Cost Than Predecessor

Anthropic has released Sonnet 5.5, the latest version of its mid-tier Claude model, claiming 30% faster performance and significantly lower token costs than its predecessor. The company says the model now outperforms Opus 5.5 on agentic coding tasks and carries cyber capabilities comparable to Opus 5.

September 28, 2026 · 6:05 PM3 min read

Anthropic Claude Sonnet 5.5