Claude Haiku 5.5 is now available in Devin

Claude Haiku 5.5 is now available in Devin, including as a sidekick model in Devin Fusion. You can use it in the Devin CLI with Opus 5.5 as the lead model.

Devin reports a 58.4% score on its proprietary FrontierCode 1.1 engineering benchmark, ahead of Sonnet 5 at about an eighth of the cost per task.