Step 3.5 Flash 0202

Step 3.5 Flash 0202 is a StepFun open-weights reasoning model, released 2 Feb 2026. Its best configuration ranks #360 of 784 on the BenchLeader Index at 50.8 ±5.9, in the upper half. The ± is the point: 349 other configurations score within that range, so they and this one cannot be told apart on quality alone — price and speed are what separate them. It scores highest in instruction following (64) and lowest in knowledge (43). At $0.150 per million tokens blended it is among the cheapest fifth of ranked models. Output speed of 145 tokens per second puts it in the fastest quarter, with a first answer in 17.1 s. Last measured 2 Feb 2026.stale: no new result in six months

Blended price

$0.150/M

$0.100 in · $0.300 out

Output speed

145 tok/s

measured by Artificial Analysis

First answer

17 s

Context

256k

Full answer

21 s

median, reasoning included

Cost per run

–

Released

2 Feb 2026