Step 3.5 Flash pricing
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.... Below you will find 1 current row with input and output dollars per million. Right now the lowest input is $0.090 and the lowest output is $0.300.
Pricing across providers
Every row is a seller of Step 3.5 Flash with token pricing we track. The cheapest input in this snapshot is from Openrouter. The bar chart shows the same input and output dollars per million for a quick scan.
| Provider | Input / 1M | Output / 1M | Cached input | Batch |
|---|---|---|---|---|
O Openrouter | $0.090 | $0.300 | — | — |
Input vs output · 1M tokens
Cost calculator
The calculator uses the same dollars per million tokens as the table. Adjust sliders to see how Step 3.5 Flash cost scales with traffic.
0.009000¢ / req
0.015000¢ / req
Model specifications
These fields describe Step 3.5 Flash as we store it (source: Stepfun). They sit next to price so buyers can check limits and tools in one place.
- Context window
- 262,144 tokens
- Max output
- 65,536 tokens
- Vision (images)
- No
- Tool / function calling
- Yes
- Streaming
- Yes
- Released
- Jan 2026
- Primary provider
- Stepfun
- Model family
- N/A
Compare Step 3.5 Flash
Jump into a comparison when you want one table for two models instead of two tabs. 6 curated matches for Step 3.5 Flash.
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Frequently asked questions
Quick frequently asked items for Step 3.5 Flash pricing and limits. The short model note from our index: 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....
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Other models by Stepfun with live pricing in our catalog.