All Models
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....
Benchmarks
Available Providers (9)
| 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 | |
 OpenRouter | stepfun/step-3.5-flash | $0.09/MTok | $0.30/MTok | 262.1K | 16.4K | |
 routing.run | route/step-3.5-flash | $0.10/MTok | $0.29/MTok | 262.1K | 65.5K | |
 Hugging Face | stepfun-ai/Step-3.5-Flash | $0.10/MTok | $0.30/MTok | 262.1K | 256K | |
 StepFun AI | 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 | |
 StepFun | step-3.5-flash | $0.10/MTok | $0.30/MTok | 256K | 256K | |
 Kilo Gateway | stepfun/step-3.5-flash | $0.10/MTok | $0.30/MTok | 256K | 256K | |
 NanoGPT | stepfun-ai/step-3.5-flash | $0.20/MTok | $0.50/MTok | 256K | 256K |
Capabilities
Reasoning
Tool Calling
Attachments
Open Weights
Structured Output