Cognition launches SWE-2, matching Fable 5.1 on FrontierCode at 64% lower cost
simonguozirui · x · 2026-09-11
Cognition announced SWE-2, its first attempt at scaling intelligence/cost, matching Fable 5.1 on FrontierCode at 64% lower cost. The key was a penalty that preserves the shape of the test-time scaling curve during training. SWE-2 is also Cognition's first model with effort levels: a single RL run pushes the whole Pareto curve — medium effort gets both cheaper and smarter, while max effort learns to spend more tokens and turns for top scores.
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