Model information
Released
2026-01-29
Context window
256K
Max output
256K
Model parameters
199B
Weights
Open
Modalities
Input
Text
Output
Text
Identity
- Version
- step-3.5-flash
- Knowledge cutoff
- 2025-01
- License
- Apache-2.0
- Aliases
- Step 3.5 Flash
Resources
Capabilities
Open weightReasoningTemperatureTool call
Official price
input $0.1/M · output $0.3/M
cache read $0.02/M
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 | ReasoningTool callTemperature | - | - | Yes | ||
| StepFun Step Plan (China) | step-3.5-flash | openai_chat | 256K | 256K | ReasoningTool callTemperature | - | - | Yes | ||
| ZenMux | stepfun/step-3.5-flash | openai_chat | 256K | 256K | Tool callTemperature | - | input $0.1/M · output $0.3/M | Yes | ||
| EmpirioLabs AI | step-3-5-flash | openai_chat | 256K | 256K | ReasoningTool callStructuredTemperature | - | input $0.1/M · output $0.3/M cache read $0.02/M | Yes | ||
| Kilo Gateway | stepfun/step-3.5-flash | openai_chat | 256K | 256K | ReasoningTool callTemperature | - | input $0.1/M · output $0.3/M | Yes | ||
| Vercel AI Gateway | stepfun/step-3.5-flash | openai_chat | 256K | 256K | ReasoningTool callTemperature | - | input $0.09/M · output $0.3/M cache read $0.02/M | Yes | ||
| OpenRouter | stepfun/step-3.5-flash | openai_chat | 256K | 256K | ReasoningTool callTemperature | Reasoning required, 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 | ReasoningTool callTemperature | - | input $0.1/M · output $0.3/M cache read $0.02/M | Yes | ||
| Qiniu | stepfun/step-3.5-flash | openai_chat | 256K | 256K | AttachmentsTemperature | - | - | Yes | ||
| StepFun (China) | step-3.5-flash | custom | 256K | 256K | ReasoningTool callTemperature | - | input $0.1/M · output $0.3/M cache read $0.02/M | Yes |