Step 3.5 Flash: Fast Enough to Think. Reliable Enough to Act.

Read https://static.stepfun.com/blog/step-3.5-flash/ for the benchmark figures on models/step-3-5-flash. As recorded by the reader: Scores are for the released (post-trained) Step 3.5 Flash from the official release blog; the blog also confirms 74.4% SWE-bench Verified in prose. Terminal-Bench 2.0 (51.0) and HMMT/IMOAnswerBench/xbench results are reported but excluded (only Terminal-Bench 2.1 is on the allowed list). Base-model pretraining scores on the HF base card (e.g. MMLU 85.8, MMLU-Pro 62.3, GPQA 41.7) were not used because they describe the base checkpoint, not step-3.5-flash.