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A side-by-side comparison of GPT-5.5 Pro and OpenAI: GPT-5 Nano, using the lowest price and highest limits found across every provider that offers each model.
| GPT-5.5 Pro | OpenAI: GPT-5 Nano | |
|---|---|---|
| Providers | 33 | 43 |
| Cheapest input ($/M) | $4.6472 via DaoXE | $0.0075 via QiHang AI |
| Cheapest output ($/M) | $27.8829 via DaoXE | $0.0602 via QiHang AI |
| Max context | 1.1M | 400K |
| Max output | 128K | 360K |
| Released | Apr 22, 2026 | Nov 20, 2024 |
| Open weights | No | No |
| Features | ReasoningToolsStructured outputFiles | ReasoningToolsStructured outputFiles |
| Input modalities | FileImageText | ImageText |
| Output modalities | Text | Text |