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SWE 1.5

SWE-1.5 is described as a frontier-size model optimized as part of a full agent stack (model, inference, and harness), developed with end-to-end RL on real task environments and served at high speed via a Cerebras partnership, with availability through Windsurf.
New Multimodal Gen 3
Released: October 29, 2025

Overview

SWE-1.5 is Cognition’s fast software-engineering agent model designed for strong coding performance with very high token throughput.

About Cognition AI

Cognition AI is an applied artificial intelligence lab focused on reasoning and coding, best known for creating Devin, recognized as the world's first autonomous AI software engineer. Founded in 2023 by Scott Wu, Walden Yan, and Steven Hao, the company focuses on developing AI agents that act as collaborative team members capable of planning and executing complex software engineering tasks

Industry: Artificial Intelligence
Company Size: 100
Location: San Francisco, CA, US
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Tools using SWE 1.5

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Last updated: February 27, 2026
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