0

Step 3.5 Flash

Step 3.5 Flash is an AI model from Stepfun.

Publisher
Stepfun
Family
Step
Input
Output
Released
2 Feb 2026

Cite

Notes

Only stored in your browser.

Attribution

Benchmark scores
AA
Attribution policy →
Input
$0.10
/1M tok
Output
$0.30
/1M tok
Blended
$0.15
#192/ 414/1M · 3:1
Speed
221
#18/ 414tok/s

Price & speed via Artificial Analysis · ranked across tracked models

Reported on 6 evals across 4 domains - best 94.4% on τ²-bench (Tau²-bench) · #17 of 320

Reported eval scores

6