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Step 3.5 Flash 2603

Reasoning Tool Calling Open Weights Structured Output

StepFun flash model for efficient multimodal reasoning, coding, and tool use

Providers 6
Released Apr 2, 2026
Input Modalities text
Output Modalities text
Tarsk Use coding

Available Providers (6)

Provider Model ID Input Cost Output Cost Context Max Output Docs
NanoGPT stepfun-ai/step-3.5-flash-2603 $0.10/MTok $0.30/MTok 256K 256K
EmpirioLabs AI step-3-5-flash-2603 $0.10/MTok $0.30/MTok 256K 131.1K
StepFun (Global) step-3.5-flash-2603 $0.10/MTok $0.30/MTok 256K 256K
StepFun (China) step-3.5-flash-2603 $0.10/MTok $0.30/MTok 256K 256K
StepFun Step Plan (Global) step-3.5-flash-2603 —/MTok —/MTok 256K 256K
StepFun Step Plan (China) step-3.5-flash-2603 —/MTok —/MTok 256K 256K

Capabilities

Reasoning
Tool Calling
Attachments
Open Weights
Structured Output