All Models

Step 3.5 Flash (free)

step Reasoning Tool Calling Open Weights
Providers 2
Released Jan 29, 2026
Input Modalities text
Output Modalities text
Tarsk Use coding

Available Providers (2)

Provider Model ID Input Cost Output Cost Context Max Output Docs
OpenRouter stepfun/step-3.5-flash:free $0.00/MTok $0.00/MTok 256K 256K
ZenMux stepfun/step-3.5-flash-free $0.00/MTok $0.00/MTok 256K 64K

Capabilities

Reasoning
Tool Calling
Attachments
Open Weights
Structured Output