StepFun: Step 3.5 Flash
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....
Modalities
Text
In / out price
₩176 / ₩527
1M
Context
262.14K
Released
Jan 30, 2026
Pricing
Prices are quoted in Korean won. Changes to the exchange rate or margin show up immediately.
| Input (prompt) | ₩176 / 1M |
| Output (completion) | ₩527 / 1M |
| Cache read | ₩18 / 1M |
| Cache write | — |
1,000 input tokens plus 1,000 output tokens costs about ₩0.702.