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....
| Provider | In $/M | Out $/M | Context | Uptime |
|---|---|---|---|---|
| DeepInfrafp8 | $0.090 | $0.300 | 262K | 99.6% |
| SiliconFlowfp8 | $0.100 | $0.300 | 262K | 99.5% |
Step 3.5 Flash costs $0.090 per million input tokens and $0.300 per million output tokens via OpenRouter, making it 43rd cheapest of 298 paid models.
Step 3.5 Flash scores 37.8 on the Artificial Analysis Intelligence Index, ranking 52nd of 178 benchmarked models, with a GPQA Diamond score of 83%.
Step 3.5 Flash generates around 46 tokens per second with 406ms time-to-first-token (p50), the 181st fastest tracked model.
Step 3.5 Flash supports a 262K-token context window and can output up to 16K tokens. It accepts text input.