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StepFun: Step 3.5 Flash
step-3.5-flash
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....
Modalities
Input
text
Output
text
Pricing
Cost per 1 million tokens
Input
$0.12
Output
$0.36
Model Specs
Context Window
256,000Max Output
256,000Release Date
2026-01-29Knowledge Cutoff
2025-01Capabilities
Reasoning
Tool Calling
Vision
Last Updated: 2026-01-29
Provider: