Step 3.5 Flash

StepFunOpen weightsNon-reasoningProvisionalReleased Feb 1, 2026Input: text

Overall score

42.1

Rank 131 of 222 · 32.4–51.9

Context window

256K

256,000 tokens

Price per 1M tokens

$0.10 in · $0.30 out

Source: BenchLM

Blended price

$0.15

3:1 input:output tokens

Output speed

—

Not measured yet

Category scores

Scores per capability area with the model's rank among ranked models in that category.

Higher is better. #N is the model's rank in that category, where it is eligible to be ranked.

As reported in system cards, papers and public evaluations. Position compares this model with every other model reporting the same benchmark.

SWE-bench Verified	74.4	#43 of 98
LiveCodeBench v6	86.4	#14 of 46

97.3

#2 of 38

USD per 1M tokens.

Source	Input	Output	Cached in
List price (BenchLM)	$0.10	$0.30	—
OpenRouter stepfun/step-3.5-flash	$0.10	$0.30	—

StepFun's official pricing page lists step-3.5-flash at $0.10 input / $0.30 output per million tokens, with a separate cached-input rate.

Human-preference ratings from LMArena. Best-rated variant shown.

1403

#150 · 60.3K votes

From the Hugging Face repository.

Measured by us through OpenRouter (median of trials).

Not measured yet.