StepFun/ Step
Step 3.5 Flash
stepfun/step-3.5-flash
StepFun flash lane for quick multimodal reasoning and coding assistance
Released
2026-01-29
Context window
256K
Max output
256K
Weights
Open weight
Modalities
Input
Text
Output
Text
Identity
- Version
- step-3.5-flash
- Knowledge cutoff
- 2025-01
- Aliases
- Step 3.5 Flash
Resources
Providers
| Provider | Provider model ID | Protocol | Context | Max output | Input | Output | Capabilities | Notes | Pricing | Streaming |
|---|---|---|---|---|---|---|---|---|---|---|
| StepFun Step Plan (Global) | step-3.5-flash | openai_chat | 256K | 256K | Text | Text | ReasoningTool callTemperatureOpen weight | Interleaved output | - | Yes |
| StepFun Step Plan (China) | step-3.5-flash | openai_chat | 256K | 256K | Text | Text | ReasoningTool callTemperatureOpen weight | Interleaved output | - | Yes |
| ZenMux | stepfun/step-3.5-flash | openai_chat | 256K | 256K | Text | Text | ReasoningTool callTemperatureOpen weight | - | input $0.1/M output $0.3/M | Yes |
| EmpirioLabs AI | step-3-5-flash | openai_chat | 256K | 256K | Text | Text | ReasoningTool callTemperatureOpen weight | - | input $0.1/M · cache read $0.02/M output $0.3/M | Yes |
| Kilo Gateway | stepfun/step-3.5-flash | openai_chat | 256K | 256K | Text | Text | ReasoningTool callTemperatureOpen weight | - | input $0.1/M output $0.3/M | Yes |
| Vercel AI Gateway | stepfun/step-3.5-flash | openai_chat | 256K | 256K | Text | Text | ReasoningTool callTemperatureOpen weight | - | input $0.09/M · cache read $0.02/M output $0.3/M | Yes |
| OpenRouter | stepfun/step-3.5-flash | openai_chat | 256K | 256K | Text | Text | ReasoningTool callTemperatureOpen weight | Hugging Face: stepfun-ai/Step-3.5-Flash | input $0.1/M output $0.3/M | Yes |
| StepFun (Global) | step-3.5-flash | custom | 256K | 256K | Text | Text | ReasoningTool callTemperatureOpen weight | Interleaved output | input $0.1/M · cache read $0.02/M output $0.3/M | Yes |
| Qiniu | stepfun/step-3.5-flash | openai_chat | 256K | 256K | Text | Text | ReasoningTool callTemperatureOpen weight | - | - | Yes |
| StepFun (China) | step-3.5-flash | custom | 256K | 256K | Text | Text | ReasoningTool callTemperatureOpen weight | Interleaved output | input $0.1/M · cache read $0.02/M output $0.3/M | Yes |
Capabilities
ReasoningTool callTemperatureOpen weight
Official price
input $0.1/M · cache read $0.02/M
output $0.3/M