LLM Comparison
Solar Pro 3 vs Step 3.5 Flash
Side-by-side specs, pricing & capabilities · Updated April 2026
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2/6 modelsSame tier:
S Solar Pro 3 | S Step 3.5 Flash | |
|---|---|---|
| Organization | Upstage | StepFun |
| OpenTools Score | ||
| Family | Solar | Step |
| Status | Current | Current |
| Release Date | Jan 2026 | Jan 2026 |
| Context Window | 128K tokens | 262K tokens |
| Input Price | $0.15/M tokens | $0.10/M tokens |
| Output Price | $0.60/M tokens | $0.30/M tokens |
| Pricing Notes | Cache read: $0.0150/M tokens | — |
| Capabilities | textcode | textcode |
| Max Output | — | 66K tokens |
| API Identifier | upstage/solar-pro-3 | stepfun/step-3.5-flash |
| View Solar Pro 3 | View Step 3.5 Flash |
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| Model | Input | Output | Total / mo | vs Best |
|---|---|---|---|---|
| Step 3.5 FlashCheapest | $0.10 | $0.15 | $0.25 | — |
| Solar Pro 3 | $0.15 | $0.30 | $0.45 | +80% |
Upstage
Solar Pro 3
Solar Pro 3 is a large language model from Upstage. Supports up to 128,000 token context window. Available from $0.15/M input tokens.
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.
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