StepFun

Step 3.5 Flash

Feb 2, 2026ReasoningOpen weights

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Intelligence

16.6

#292 of 747Rank 292 of 747 measured models

Output speed

127 t/s

#127 of 405Rank 127 of 405 measured models

Price/1M

$0.15

#129 of 664Rank 129 of 664 measured models

Context window

256K

#521 of 1207Rank 521 of 1207 measured models

Step 3.5 Flash scores 16.6 on the Artificial Analysis Intelligence Index, ranking 292nd of 747 measured models. The closest models on this index are Gemma 4 26B A4B (16.7), Claude 4 Opus (16.6), and Ring-2.6-1T (16.6). At $0.15 per million tokens (3:1 input/output blended price), it is cheaper than Gemma 4 26B A4B ($0.175), Claude 4 Opus ($30), and Ring-2.6-1T ($0.85). With an output speed of 127 t/s, it is faster than Gemma 4 26B A4B (62.7 t/s) and Ring-2.6-1T (117 t/s).