Composer 2.5

In plain words

Composer 2.5 is an AI model designed for development tasks, offering improvements over its predecessor in intelligence and capability. It is built for developers and teams working on complex, long-horizon agentic tasks that require sustained reasoning and planning. The model stands out for its enhanced performance on extended projects where AI needs to work autonomously across multiple steps toward a goal.

written from the facts on this page · September 2026

From the sources

A substantial improvement in intelligence and behavior over Composer 2, particularly on long-horizon agentic tasks.

It's a substantial improvement in intelligence and behavior over Composer 2 . It is better at sustained work on long-running tasks, follows complex instructions more reliably, and is more pleasant to collaborate with. We improved Composer by scaling training, generating more complex RL environments, and introducing new learning methods. In addition to training Composer 2.5 on more difficult tasks, we improved behavioral aspects of the model like communication style and effort calibration. These dimensions are not well captured by existing benchmarks, but we find that they matter for real-world usefulness. Composer 2.5 is built on the same open-source checkpoint as Composer 2, Moonshot's…from cursor.com

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