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# Claude Haiku 5.5 is now available in Devin

CognitionOctober 7, 20261 min read

Claude Haiku 5.5 is now live in Devin.

On [FrontierCode 1.1](https://cognition.ai/blog/frontier-code-1.1), our proprietary benchmark that grades models on real-world engineering tasks based on quality and mergeability, Haiku 5.5 scores 58.4%. That puts it ahead of Sonnet 5 at about an eighth of the cost per task.

Claude Haiku 5.5 joins the sidekick lineup in Devin Fusion as an excellent option. With Haiku 5.5 as the sidekick, Fusion holds a top-tier FrontierCode score of 66.2 while cutting cost and latency. You can try it today in the Devin CLI with Opus 5.5 as the lead.

[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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