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Cognition says Haiku 5.5 beats Sonnet 5 on its proprietary engineering benchmark at about one-eighth of the cost per task.
Cognition announced Claude Haiku 5.5 support in Devin in a post dated October 7, 2026, adding the model to Devin Fusion’s sidekick lineup. For Devin CLI users, the company suggested pairing it with Opus 5.5 as the lead model.
For Fusion with Haiku 5.5 as its sidekick, Cognition reports a FrontierCode score of 66.2 and says the setup cuts cost and latency. The announcement gives no figures for either reduction. That score describes the combined system, rather than Haiku 5.5 operating alone.
Haiku 5.5’s own result is 58.4% on FrontierCode 1.1, according to Cognition. The company says that puts it ahead of Sonnet 5 at about one-eighth of the cost per task. FrontierCode is Cognition’s proprietary benchmark, which it describes as grading real-world engineering tasks on quality and mergeability. Both the performance comparison and the relative cost claim come from that vendor-run evaluation.
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Devin (Cognition), Claude Haiku 5.5 is now available in Devin
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