Step 3.5 FlashOpen weights
StepFun · released 2026-01-29
The official API price of Step 3.5 Flash is $0.10461 per 1M input tokens and $0.31384 per 1M output tokens (as of 2026-11-12). Context window: 256K tokens, up to 256K output tokens per request. 15 providers sell it. The lowest is CommandCode: $0.09 input, $0.3 output.
Price by providerUSD per 1M tokens
| Provider | Input | Output | Cached | Notes | |
|---|---|---|---|---|---|
| StepFun (China)Officialstep-3.5-flash | $0.10461 | $0.31384 | $0.02092 | Official | Official docs |
 CommandCodeLoweststepfun/ | $0.09 | $0.3 | $0.02 | Lowest | Official docs |
EEden AIdeepinfra/ | $0.09 | $0.3 | $0.02 | Official docs | |
 EmpirioLabs AIstep-3-5-flash | $0.1 | $0.3 | $0.02 | Official docs | |
 Hugging Facestepfun-ai/ | $0.1 | $0.3 | — | Official docs | |
KKilo Gatewaystepfun/ | $0.1 | $0.3 | — | Official docs | |
NNanoGPTstepfun-ai/ | $0.1 | $0.3 | $0.05 | Official docs | |
 OpenRouterstepfun/ | $0.1 | $0.3 | — | Official docs | |
 SiliconFlowstepfun-ai/ | $0.1 | $0.3 | — | Official docs | |
SStepFun (Global)step-3.5-flash | $0.1 | $0.3 | $0.02 | Official docs | |
 ZenMuxstepfun/ | $0.1 | $0.3 | — | Official docs | |
| SiliconFlow (China)stepfun-ai/ | $0.104613 | $0.31384 | — | Official docs |
3 more listings
| Provider | Input | Output | Cached | Notes | |
|---|---|---|---|---|---|
QQiniuDeprecatedstepfun/ | — | — | — | Deprecated | Official docs |
SStepFun Step Plan (Global)step-3.5-flash | — | — | — | Official docs | |
SStepFun Step Plan (China)step-3.5-flash | — | — | — | Official docs |
Providers are those listed by models.dev. This site has not vetted them one by one; each provider's own page has the binding price.
About
StepFun flash lane for quick multimodal reasoning and coding assistance
Description from models.dev.
Specs
- Type
- Text
- Context
- 256K
- Max output
- 256K
- Input
- Text
- Output
- Text
- Reasoning
- Yes
- Tool calling
- Yes
- Structured output
- Yes
- Knowledge cutoff
- 2025-01
- Open weights
- Yes
- Released
- 2026-01-29
Source
Prices and specs come from models.dev (MIT licence), updated 2026-11-12. Each provider's name links to its official docs. A provider priced at 0 usually includes the model in a subscription; it is not necessarily a free API.