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Description

Step 3.5 Flash is a lightweight language model from StepFun with a 262K token context window, designed for fast inference on tasks that don't require the full capacity of larger models.

OpenAI's frontier model for complex professional workloads. 1M token context, text + image input, native computer use.

I/O price /1M

$0.1/$0.3

$5.00/$30.00

Input /1M

$0.1

$5.00

Output /1M

$0.3

$30.00

Cached in /1M

—

$0.5

Context

262K

Δ input since launch

11.1%

—

Δ output since launch

0.0%

—

Released

Jan 2026

Apr 2026

Status

—

Provider

S StepFun

OpenAI