Step 3.5 Flashon Krater.ai
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
Released January 29, 2026
Specifications
Step 3.5 Flash at a glance
Context
262.1K tokens
Max output
65.5K tokens
Input
Text
Output
Text
Input price
$0.10 / 1M
Output price
$0.30 / 1M
Capabilities
What it is good at
Catalog capabilities
- Generates text responses
- Supports tool calling
Good for
Compare
Compare Step 3.5 Flash
Step 3.5 Flash vs Step 3.7 Flash
Step 3.7 Flash is StepFun's latest high-efficiency multimodal Mixture-of-Experts model.
Open comparisonStep 3.5 Flash vs Step 3.5 Flash (free)
Step 3.5 Flash is StepFun's most capable open-source foundation model.
Open comparisonStep 3.5 Flash vs Step3
Step3 is a cutting-edge multimodal reasoning model—built on a Mixture-of-Experts architecture with 321B total parameters and 38B active.
Open comparisonFAQ
Questions about Step 3.5 Flash
Clear answers based on the model catalog and Krater access.
Use Step 3.5 Flash in your API
Connect with Krater's unified API.
Ready to use Step 3.5 Flash?
Access leading models in one focused workspace.