TechFlow message: On July 25, Opus 5 outperformed Fable 5 in a 3D destructive physics simulation task, and its cost was only half of the latter. The test required four models to build three real physics scenarios using HTML: a tornado, a building-demolition ball, and a truck crushing a bridge. Opus 5 completed all tasks correctly, while Fable 5’s tornado could hardly pull objects in, and the buildings collapsed on their own before the ball made contact. Opus 5 cost $1.40, while Fable 5 cost $2.82. Neither Kimi K3 nor GPT 5.6 passed the test.