StepFun: Step 3.5 Flash vs OpenAI: GPT-5 Pro
StepFun: Step 3.5 Flash is cheaper on output tokens, while OpenAI: GPT-5 Pro offers a larger context window. Choose StepFun: Step 3.5 Flash or OpenAI: GPT-5 Pro based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | StepFun: Step 3.5 Flash | OpenAI: GPT-5 Pro |
|---|---|---|
| Provider | Kilo Gateway | Kilo Gateway |
| Input / 1M tokens | $0.10 | $15.00 |
| Output / 1M tokens | $0.30 | $120.00 |
| Context window | 256K | 400K |
| Parameters | — | — |
| Open weights | Yes | No |
| Released | Jan 2026 | Oct 2025 |
FAQ
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.