Claude Haiku 5.5 is now available in Devin

source: news (news:ml-devin-blog)published 2026-10-07 17:00ingested 2026-10-24 10:06

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Claude Haiku 5.5 is now live in Devin.
On FrontierCode 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.

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