StepFun(@StepFun_ai):Step 5 Preview works across software environments and sustains execution over long horizons. Its capabilities extend from software engineering and web applications to 3D workflows and programmable hardware. Over longer horizons, Step 5 Preview keeps track of prior results, uses execution feedback to decide what to try next, and continues iterating. We test this behavior in runs lasting up to 24 hours, including tasks involving GPU kernel optimization and automated post-training.

2026.09.20 03:15

Step 5 Preview works across software environments and sustains execution over long horizons. Its capabilities extend from software engineering and web applications to 3D workflows and programmable hardware. Over longer horizons, Step 5 Preview keeps track of prior results, uses execution feedback to decide what to try next, and continues iterating. We test this behavior in runs lasting up to 24 hours, including tasks involving GPU kernel optimization and automated post-training.