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AI Code Generation

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Saturday, 12 September 2026

Cognition Releases SWE-2: A Kimi K3 Post-Trained Coding Model That Matches Fable 5.1 on FrontierCode at 64% Lower Cost

MarkTechPost 1 month ago 30 ● 2 sources

Cognition released SWE-2, a post-trained coding model built from Moonshot AI’s 2.8T-parameter Kimi K3 and trained with reinforcement learning. It scored 50.0% on FrontierCode 1.1 Main, within 1 point of Fable 5.1, while claiming 64% lower cost. The update adds selectable reasoning-effort levels and changes deployment by keeping the model closed (no open weights or standalone API), running only inside Devin (with Devin Web and Fusion rolling out).

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