StepFun flash model for efficient multimodal reasoning, coding, and tool use
Step 5 Preview by stepfun is currently listed from a single provider. Its reference price is $1.00 per 1M input tokens and $2.70 per 1M output tokens.
Artificial Analysis rates it 43.7 on the Intelligence Index. Against its lowest blended price of $1.43 per 1M, that is roughly 31 index points per dollar, which is the value ratio the leaderboards rank on. Median output speed is 100 tokens per second, with 2.96s to the first token. Running one task of the Artificial Analysis suite costs about $0.7147, which reflects how many tokens its reasoning consumes rather than the unit price alone.
The context window is 1,000,000 tokens, with an output limit of 1,000,000 tokens. Accepted input modalities are Text and Image.
Quality is independently evaluated by Artificial Analysis. Speed/latency are model-level medians.
| Provider | Tier | Input | Output | Cache read | Cache write | Context | Output limit | Status |
|---|---|---|---|---|---|---|---|---|
| Vercel AI Gateway | Cloud | $1.00 | $2.70 | $0.05 | — | 1,000,000 | 1,000,000 |
Sorted by blended price (input×0.75 + output×0.25) asc. The official channel always shows regardless of rank. Whether a gateway's low price is actually usable can't be verified.
Price history accumulates from each data sync; currently only 1 sample(s) (2026-09-20). Each future sync adds a point, and once accumulated a line is drawn here.
Individual evaluations run by Artificial Analysis, on the same reasoning tier as the intelligence score above. Each benchmark has its own task set and harness, so rows are not comparable with one another. The Intelligence Index above draws on a different, newer set of evaluations.