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Step 3.5 Flash 2603

Reasoning Tool Calling Open Weights
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Released Apr 2, 2026
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Tarsk Use coding

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Provider Model ID Input Cost Output Cost Context Max Output Docs
StepFun step-3.5-flash-2603 $0.10/MTok $0.30/MTok 256K 256K

Capabilities

Reasoning
Tool Calling
Attachments
Open Weights
Structured Output