Step 3.5 Flash 2603

Creator

StepFun

Released

2026-04-02

Intelligence

38.5

Artificial Analysis Index

Coding

34.6

Artificial Analysis Index

In $/1M

$0.10

input tokens

Out $/1M

$0.30

output tokens

Blended $/1M

$0.15

3:1 blended

Speed

196

tokens / sec

Benchmark breakdown

Independent evaluation scores, normalized to 0–100.

GPQA Diamond
83
Humanity’s Last Exam
23
MMLU-Pro
SciCode
39
LiveCodeBench
MATH-500
AIME 2025
τ²-Bench (agentic)
87
Terminal-Bench Hard
33
IFBench
67
Via Artificial Analysis