# Claude Haiku 5.5 is now available in Devin

By Steven Van · 2026-10-07

Haiku 5.5 scores 58.4% on Devin's FrontierCode 1.1 and can serve as the Fusion sidekick, which you can try now in the Devin CLI with Opus 5.5 leading.

Claude Haiku 5.5 is now live in [Devin](<https://creatorstoolbox.com/tools/devin>), and it is also available as a sidekick model in Devin Fusion. Devin's [announcement](<https://devin.ai/blog/claude-haiku-5-5>) says it scores 58.4% on FrontierCode 1.1, ahead of Sonnet 5, at about an eighth of the cost per task.

## Benchmark result

FrontierCode 1.1 is Devin's proprietary benchmark. It grades models on real-world engineering tasks, based on quality and mergeability. Devin also publishes a FrontierCode Leaderboard that benchmarks how well models meet the standards of high-quality production codebases.

## Haiku 5.5 in Devin Fusion

Haiku 5.5 joins the sidekick lineup in Devin Fusion. Devin describes it as an excellent option for that role. With Haiku 5.5 as the sidekick, Fusion holds a FrontierCode score of 66.2 while cutting cost and latency.

## How to try it

The Devin CLI supports it today, with Opus 5.5 as the lead model.

[![](<https://devin.ai/images/blog/claude-haiku-5-5/cover.png>)](<https://devin.ai/blog/claude-haiku-5-5>)

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Sources

[Original source](<https://devin.ai/blog/claude-haiku-5-5>)

[Read Claude Haiku 5.5 is now available in Devin on Creators Toolbox](<https://creatorstoolbox.com/blog/devin-claude-haiku-5-5-is-now-available-in-devin>)

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Canonical source: https://creatorstoolbox.com/blog/devin-claude-haiku-5-5-is-now-available-in-devin