Claude Haiku 5.5 comes to Devin, beating Sonnet 5 at about an eighth of the cost

At a glance

Claude Haiku 5.5 is now available in Devin. It outscored Sonnet 5 on Devin's in-house coding benchmark while costing about one-eighth as much per task.

Key points

1. 1

   It scored 58.4% on Devin's FrontierCode 1.1 benchmark, ahead of Sonnet 5.

2. 2

   It joins the helper (sidekick) models in Devin Fusion, which pairs a lead model with a helper model.

3. 3

   With Haiku 5.5 as the helper, Fusion keeps a top-tier score of 66.2 while cutting cost and delay.

4. 4

   Users can try it now in the Devin CLI (command-line tool) with Opus 5.5 as the lead model.

Why it matters

A cheap model with strong coding quality lets Devin users cut costs and waiting time without giving up much performance.