All Models

Step 3.5 Flash

Reasoning Tool Calling Open Weights Structured Output

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

Providers 12
Released Jan 29, 2026
Input Modalities text
Output Modalities text
Tarsk Use coding

Benchmarks

26.5
Intelligence Index

Available Providers (12)

Provider Model ID Input Cost Output Cost Context Max Output Docs
Nvidia stepfun-ai/step-3.5-flash $0/MTok $0/MTok 256K 16.4K
Eden AI deepinfra/stepfun-ai/Step-3.5-Flash $0.09/MTok $0.30/MTok 262.1K 256K
NanoGPT stepfun-ai/step-3.5-flash $0.10/MTok $0.30/MTok 256K 256K
Hugging Face stepfun-ai/Step-3.5-Flash $0.10/MTok $0.30/MTok 262.1K 256K
OpenRouter stepfun/step-3.5-flash $0.10/MTok $0.30/MTok 262.1K 65.5K
StepFun (Global) step-3.5-flash $0.10/MTok $0.30/MTok 256K 256K
StepFun (China) step-3.5-flash $0.10/MTok $0.30/MTok 256K 256K
ZenMux stepfun/step-3.5-flash $0.10/MTok $0.30/MTok 256K 64K
EmpirioLabs AI step-3-5-flash $0.10/MTok $0.30/MTok 256K 131.1K
Kilo Gateway stepfun/step-3.5-flash $0.10/MTok $0.30/MTok 262.1K 65.5K
StepFun Step Plan (China) step-3.5-flash —/MTok —/MTok 256K 256K
StepFun Step Plan (Global) step-3.5-flash —/MTok —/MTok 256K 256K

Capabilities

Reasoning
Tool Calling
Attachments
Open Weights
Structured Output