StepFun API pricing
As of October 22, 2026, the StepFun API prices run from $0.30 to $2.70 per million output tokens across 3 models, as listed on OpenRouter. Step 3.5 Flash is the cheapest paid model at $0.10 input and $0.30 output per million tokens, and Step 5 Preview the most expensive at $1.00 input and $2.70 output.
Step 5 Preview ranks first among StepFun models in our Vibe Coding Index, at 61.1 on 4 benchmarks. 1 of 3 StepFun models have any benchmark score. No StepFun model has a published run cost in the sources we read, so cost per solved task shows No run cost rather than an estimate.
| Model | Input $/Mtok | Output $/Mtok | Context | Evidence | Index | Cost per solved task |
|---|---|---|---|---|---|---|
| Step 5 Preview | $1.00 | $2.70 | 1.05M | 61.1 | No run cost | |
| Step 3.7 Flash | $0.20 | $1.15 | 262K | Not benchmarked | No run cost | |
| Step 3.5 Flash | $0.10 | $0.30 | 262K | Not benchmarked | No run cost |
Price changes
No change in a maker's own API price recorded yet. We read prices daily from OpenRouter (since October 15, 2026) and list a change only when the maker's own price moves between two of our snapshots.