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# Claude Sonnet 5.5 is now available in Devin

CognitionSeptember 28, 20261 min read

On [FrontierCode 1.1](https://cognition.ai/blog/frontier-code-1.1), Sonnet 5.5 is a significant improvement from Sonnet 5 at 64.4%, surpassing even Fable 5.1 at extra high reasoning effort.

Anthropic reports more than 30% faster output generation and up to 30% lower cost per task than Sonnet 5, with unchanged token pricing.

[FrontierCode LeaderboardBenchmarks for how well models meet the standards of high-quality production codebasesView Now](https://cognition.ai/frontiercode)

#### FrontierCode 1.1 ExtendedScore

Score is a weighted aggregate of rubric items. Solutions that don’t pass blocking criteria receive 0.

#### FrontierCode 1.1 ExtendedScorevsCost ($)

Score: a weighted aggregate of the rubric items. Solutions that don’t pass blocking criteria receive 0.

Cost ($): the mean USD spend per rollout. Each dot is a reasoning effort.

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