SWE-2 (max) reportedly scores 67.3 on BuildingBench
EnactraAI puts Cognition’s SWE-2 (max) 2.5 points behind GPT-6 Sol (ultra) and says SWE-2 was free to use as of September 25, 2026.
TLDR
EnactraAI’s September 25, 2026 update gives Cognition’s SWE-2 (max) a BuildingBench score of 67.3, behind GPT-6 Sol (ultra) at 69.8 and ahead of GPT-5.6 Luna at 61.6. It described SWE-2 as “free to use for now.”
In its September 23 comparison, EnactraAI reported that Opus 5.5 (max) scored 86.8—the benchmark’s highest score yet—at about $45.47 per building. GPT-6 Astra (ultra) scored 84.3 at $7.05 per building: 2.5 points behind at 84% lower cost. The same comparison put GPT-6 Sol (ultra) at about $1.92 per building.
