Step 3.5 Flash 2603
unknownStepfun
StepFun flash model for efficient multimodal reasoning, coding, and tool use
Limits
Context256,000
Input256,000
Output256,000
Modalities
Inputtext
Outputtext
Release info
Release2026-04-02
Last update2026-04-02
Knowledge cutoff2025-01
Provider offerings
Provider-specific prices and limits stay separate from canonical model facts.
| Provider | Provider model ID | Input | Output | Context | Output limit |
|---|---|---|---|---|---|
| EmpirioLabs AI | step-3-5-flash-2603 | $0.1 / 1M | $0.3 / 1M | 256,000 | 131,072 |
| StepFun Step Plan (China) | step-3.5-flash-2603 | Unknown | Unknown | 256,000 | 256,000 |
| StepFun (Global) | step-3.5-flash-2603 | $0.1 / 1M | $0.3 / 1M | 256,000 | 256,000 |
| StepFun Step Plan (Global) | step-3.5-flash-2603 | Unknown | Unknown | 256,000 | 256,000 |
| StepFun (China) | step-3.5-flash-2603 | $0.1 / 1M | $0.3 / 1M | 256,000 | 256,000 |
| NanoGPT | stepfun-ai/step-3.5-flash-2603 | $0.1 / 1M | $0.3 / 1M | 256,000 | 256,000 |
Capabilities
Attachments
No
Reasoning
Yes
Tool calling
Yes
Structured output
Unknown
Temperature
Yes