🔥Step 3.5 Flash

StepFun model details for pricing, context, and release tracking.

Pricing data updated:  Prices normalized to USD per 1M tokens Sample workload: 1M input + 500K output
Model Specs
ProviderStepFun
Model IDstepfun/step-3.5-flash
Prompt Price
per 1M tokens		$0.1
Completion Price
per 1M tokens		$0.3
Sample Workload Cost
1M input + 500K output		$0.25
Context Window262.14K
Release Date2026-01-29
Popularity Rank#15
Daily Demand79.1B tokens

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Prices are normalized to USD per 1M tokens.
Step 3.5 Flash Calculating… Estimated monthly API cost
Unit prices $0.1 input / $0.3 output Per 1M tokens

This estimate uses normalized public API pricing per 1M tokens. It is a planning aid, not a billing quote. Verify provider pricing, limits, and terms before production use.

Model Introduction

Step 3.5 Flash is StepFun's most capable open-source foundation model. Built on a sparse Mixture of Experts (MoE) architecture, it selectively activates only 11B of its 196B parameters per token....

Best Fit

Step 3.5 Flash is best suited for cost-sensitive production traffic.

Cost Example

A 1M input token plus 500K output token workload is estimated at $0.25.

Decision Shortcuts

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