Step 3.5 Flash (Deep Infra)
step-3-5-flash
StepFun flash lane for quick multimodal reasoning and coding assistance
Specification
most-agreed values
Context
262K
Max output
256K
Released
2026-01-29
Knowledge cutoff
2025-01
Retires
—
Open weights
yes
Input
text
Output
text
Price
US dollars per million tokens · most-agreed
Input
$0.09
Output
$0.30
Cache read
$0.02
Available from 15 hosts
| Host | In $/M | Out $/M | Cache rd | Cache wr | Context | Output | Retires |
|---|---|---|---|---|---|---|---|
| commandcode · stepfun | $0.09 | $0.30 | $0.02 | — | 256K | 256K | — |
| edenai | $0.09 | $0.30 | $0.02 | — | 262K | 256K | — |
| empiriolabs | $0.10 | $0.30 | $0.02 | — | 262K | 131K | — |
| huggingface · stepfun-ai | $0.10 | $0.30 | — | — | 262K | 256K | — |
| kilo · stepfun | $0.10 | $0.30 | — | — | 262K | 66K | — |
| nano-gpt · stepfun-ai | $0.10 | $0.30 | $0.05 | — | 262K | 66K | — |
| openrouter · stepfun | $0.10 | $0.30 | — | — | 262K | 66K | — |
| siliconflow · stepfun-ai | $0.10 | $0.30 | — | — | 262K | 66K | — |
| stepfun-ai | $0.10 | $0.30 | $0.02 | — | 256K | 256K | — |
| zenmux · stepfun | $0.10 | $0.30 | — | — | 256K | 256K | — |
| siliconflow-cn · stepfun-ai | $0.1046 | $0.3138 | — | — | 262K | 262K | — |
| stepfun | $0.1046 | $0.3138 | $0.0209 | — | 256K | 256K | — |
| qiniu-ai · stepfun | — | — | — | — | 64K | 4K | — |
| stepfun-ai-step-plan | — | — | — | — | 256K | 256K | — |
| stepfun-step-plan | — | — | — | — | 256K | 256K | — |
Price history
append-only observations · a listing writes a row only when its price moves
| Date | Host | Field | $/M |
|---|---|---|---|
| 2026-09-02 | stepfun | Cache read | $0.02 |
| 2026-10-22 | stepfun | Cache read | $0.0209 |
| 2026-09-02 | siliconflow-cn · stepfun-ai | Input | $0.10 |
| 2026-10-22 | siliconflow-cn · stepfun-ai | Input | $0.1046 |
| 2026-09-02 | stepfun | Input | $0.10 |
| 2026-10-22 | stepfun | Input | $0.1046 |
| 2026-09-02 | siliconflow-cn · stepfun-ai | Output | $0.30 |
| 2026-10-22 | siliconflow-cn · stepfun-ai | Output | $0.3138 |
| 2026-09-02 | stepfun | Output | $0.30 |
| 2026-10-22 | stepfun | Output | $0.3138 |