Step-3.5-Flash-Base

Name: Step-3.5-Flash-Base
Price: 0.1 USD
Author: StepFun

StepFun🇨🇳 China

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Context window262K tokens

Input / 1M tokens$0.1

Output / 1M tokens$0.3

Version History

3.5-flashminorMarch 5, 2026

StepFun releases Step-3.5-Flash-Base as an open-source text generation model optimized for efficient inference under Apache 2.0 license.

Benchmark Scores

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41.7%

GPQA

81.1%

HumanEval

66.8%

MATH

85.8%

MMLU

62.3%

MMLU-Pro

300.0 tokens_per_sec

Speed (tok/s)

74.4%

SWE-bench Verified

Coverage

model release

Step-3.5-Flash-Base: StepFun releases lightweight text generation model

StepFun has released Step-3.5-Flash-Base, a text generation model available on Hugging Face under Apache 2.0 license. The model is part of the Step 3.5 series and focuses on efficient inference.

March 5, 2026 · 8:50 AM1 min read

stepfun model-release text-generation