SF·SIX / MODEL PROFILE
StepFun 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....
StepFun Step 3.5 Flash costs $0.10 per 1M input tokens and $0.30 per 1M output tokens at the standard tier, the lowest default-region price among the 1 provider SF·SIX tracks, from SiliconFlow (fp8). Updated ; prices checked .
- Developer
- StepFun
- Input modalities
- text
- Output modalities
- text
- Context tokens
- 262,144
- Latest price observation
- 2026-10-17
- Lowest paired standard token quote
- $0.10 input / $0.30 output per 1M tokens
Dated price and provider records
| Provider and channel | Input | Output or native rate | Unit and status | Source and observation |
|---|---|---|---|---|
| SiliconFlowOpenRouter | $0.10 | $0.30 | 1M tokenspriced · USD | OpenRouter2026-10-17 |
These are dated, non-executable observations. Verify the exact endpoint, price and terms with the source before use. Unknown values are not free.