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Model spotlight
Step 3.5 Flash 2603
StepFun flash model for efficient multimodal reasoning, coding, and tool use
Compare modelsCore capabilities
A compact view of the model contract before integration.
Input and output
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Limits and context
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Provider coverage
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Step 3.5 Flash 2603 FAQ
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Core specifications
Released
2026-04-02
Context window
256K
Max output
256K
Weights
Open
Modalities
Input
Text
Output
Text
Identity
- Version
- step-3.5-flash-2603
- Knowledge cutoff
- 2025-01
- Aliases
- Step 3.5 Flash 2603
Resources
Capabilities
Open weightReasoningTemperatureTool call
Pricing
IN $0.1/M
OUT $0.3/M
Read $0.02/M
Capabilities and fit
Model summary
StepFun flash model for efficient multimodal reasoning, coding, and tool use
Text
Open weightReasoningTemperatureTool call
- Output
- Text
- Capabilities
- 4
- Catalog updated
- 2026-04-02T00:00:00.000Z
- Status
Benchmark results
| Benchmark | Type | Score / rank | Evaluated |
|---|---|---|---|
| Artificial Analysis Coding Index | General | 34.6 | 2026-06-02T00:00:00.000Z |
| SciCode | Coding | 38.5 | 2026-06-02T00:00:00.000Z |
| Terminal-Bench Hard | Coding | 32.6 | 2026-06-02T00:00:00.000Z |
Provider coverage
| Provider | Input | Output | Pricing |
|---|---|---|---|
| StepFun Step Plan (Global) | IN $0.1/M OUT $0.3/M Read $0.02/M | ||
| StepFun Step Plan (China) | IN $0.1/M OUT $0.3/M Read $0.02/M | ||
| EmpirioLabs AI | IN $0.1/M OUT $0.3/M Read $0.02/M | ||
| StepFun (Global) | IN $0.1/M OUT $0.3/M Read $0.02/M | ||
| StepFun (China) | IN $0.1/M OUT $0.3/M Read $0.02/M |