StepFun: Step 3.5 Flash
9.3 / 10
262.1K context
Proprietary
About this model
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....
Benchmark Scores
AIME-2025
99.8
LiveCodeBench
86.4
Technical Specs
- Architecture: text->text
- Context Window: 262,144 tokens
- Input Modalities: text
Hardware Requirements
- API-only (no local hardware needed)
Pricing
| Input | Output | Currency |
|---|---|---|
| 0.1 / 1M tokens | 0.3 / 1M tokens | USD |