---
title: Announcing Devin Agent Preview with Sonnet 4.5
link: https://cognition.com/blog/devin-agent-preview-sonnet-4-5
source: cognition
published: 2025-09-29T00:00:00Z
first_seen: 2026-09-02T14:07:29.769486161Z
summary: Today we're releasing Claude Sonnet 4.5 in Devin, alongside our new Devin Agent Preview that's over 2x faster and 12% better on our Jr. Developer Evals.
---

Today we're releasing Claude Sonnet 4.5 in Devin, alongside our new Devin Agent Preview that's over 2x faster and 12% better on our Jr. Developer Evals.