# Claude Haiku 5.5 launches on Devin platform

> The new Claude Haiku 5.5 model is live in Devin, scoring 58.4% on FrontierCode 1.1 and costing about one‑eighth of Sonnet 5 per task.

Oossa · 2026-10-07 · https://oossa.com/en/claude-haiku-5-5-launches-on-devin-platform

Anthropic released Claude Haiku 5.5 on the Devin platform on Oct 7 2026. The model is now usable through the Devin command‑line interface, paired with Opus 5.5 as the lead model. It joins the sidekick lineup that powers Devin Fusion, a tool that combines multiple models for engineering work.

## How Haiku 5.5 performs

On FrontierCode 1.1 – a proprietary benchmark that grades AI on real‑world engineering tasks – Haiku 5.5 scored 58.4 %. That puts it ahead of Anthropic’s Sonnet 5 and costs roughly an eighth per task compared with Sonnet 5. When used as a sidekick in Devin Fusion, the combined system reaches a FrontierCode score of 66.2 % while reducing both cost and latency.

## The facts

- Claude Haiku 5.5 became available in Devin on 2026-10-07.
- Haiku 5.5 scored 58.4 % on FrontierCode 1.1, ahead of Sonnet 5.
- It costs about one‑eighth per task compared with Sonnet 5.
- Devin Fusion with Haiku 5.5 as sidekick reaches a 66.2 % FrontierCode score.
- The model can be tried today via the Devin CLI with Opus 5.5 as the lead.

## Why it matters

For engineers and developers who use Devin, the new Haiku 5.5 offers higher quality output at a fraction of the cost of earlier models. This makes large‑scale engineering tasks cheaper and faster, though independent benchmarks beyond FrontierCode are not yet published.

## Sources & references

1. [Claude Haiku 5.5 is now available in Devin](https://windsurf.com/blog/claude-haiku-5-5) – Windsurf, 2026-10-07
2. [Anthropic releases Claude Haiku 5.5 small model and halves Sonnet 5.5 cache read prices](https://siliconangle.com/2026/10/07/anthropic-releases-claude-haiku-5-5-small-model-and-halves-sonnet-5-5-cache-read-prices/) – SiliconANGLE, 2026-10-07

Last updated: 2026-10-07