StepFun/ Step
Step 3.5 Flash 2603
stepfun/step/3-5-flash-2603
StepFun flash model for efficient multimodal reasoning, coding, and tool use
Released
2026-04-02
Context window
256K
Max output
256K
Weights
Open weight
Modalities
Input
Text
Output
Text
Identity
- Version
- step-3.5-flash-2603
- Knowledge cutoff
- 2025-01
- Aliases
- Step 3.5 Flash 2603
Resources
Providers
| Provider | Provider model ID | Protocol | Context | Max output | Input | Output | Capabilities | Notes | Pricing | Streaming |
|---|---|---|---|---|---|---|---|---|---|---|
| StepFun Step Plan (Global) | step-3.5-flash-2603 | openai_chat | 256K | 256K | Text | Text | ReasoningTool callTemperatureOpen weight | Interleaved output | - | Yes |
| StepFun Step Plan (China) | step-3.5-flash-2603 | openai_chat | 256K | 256K | Text | Text | ReasoningTool callTemperatureOpen weight | Interleaved output | - | Yes |
| EmpirioLabs AI | step-3-5-flash-2603 | openai_chat | 256K | 256K | Text | Text | ReasoningTool callTemperatureOpen weight | - | input $0.1/M · cache read $0.02/M output $0.3/M | Yes |
| StepFun (Global) | step-3.5-flash-2603 | custom | 256K | 256K | Text | Text | ReasoningTool callTemperatureOpen weight | Interleaved output | input $0.1/M · cache read $0.02/M output $0.3/M | Yes |
| StepFun (China) | step-3.5-flash-2603 | 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