LLM Comparison
Step 3.5 Flash vs Phi 4
Side-by-side specs, pricing & capabilities · Updated April 2026
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2/6 modelsSame tier:
S Step 3.5 Flash | P Phi 4 | |
|---|---|---|
| Organization | StepFun | Microsoft |
| OpenTools Score | ||
| Family | Step | Phi |
| Status | Current | Current |
| Release Date | Jan 2026 | Jan 2025 |
| Context Window | 262K tokens | 16K tokens |
| Input Price | $0.10/M tokens | $0.07/M tokens |
| Output Price | $0.30/M tokens | $0.14/M tokens |
| Capabilities | textcode | textcode |
| Max Output | 66K tokens | 16K tokens |
| API Identifier | stepfun/step-3.5-flash | microsoft/phi-4 |
| View Step 3.5 Flash | View Phi 4 |
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| Model | Input | Output | Total / mo | vs Best |
|---|---|---|---|---|
| Phi 4Cheapest | $0.07 | $0.07 | $0.14 | — |
| Step 3.5 Flash | $0.10 | $0.15 | $0.25 | +85% |
StepFun
Step 3.5 Flash
Step 3.5 Flash is a large language model from StepFun. Supports up to 262,144 token context window. Available from $0.10/M input tokens.
Microsoft
Phi 4
Phi 4 is a large language model from Microsoft. Supports up to 16,384 token context window. Available from $0.07/M input tokens.
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