Cognition's SWE-2 coding model rivals Fable 5.1 at lower cost

Cognition, maker of the Devin coding agent, released SWE-2, a coding model post-trained with reinforcement learning from Moonshot AI's 2.8-trillion-parameter Kimi K3. It scores 50.0% on FrontierCode 1.1 Main, within one point of Fable 5.1, while costing 64% less to run.

Why it matters: This continues a trend of smaller labs post-training open Chinese base models like Kimi K3 into competitive, cheaper specialist coders rather than building frontier models from scratch. It also shows the cost gap between "good enough" and frontier coding models is narrowing fast, pressuring incumbent coding-agent pricing.