GPT-5.5 Pro vs GPT-5.4 Pro
GPT-5.5 Pro vs GPT-5.4 Pro: which AI model is cheaper, has the larger context window and more capabilities? Side-by-side comparison updated daily.
Quick verdict
- Both models cost about the same.
- Both have the same context window.
- GPT-5.5 Pro is the more recent release (Apr 24, 2026).
- GPT-5.5 Pro scores higher on independent tests (overall index 162.5 vs 159.1).
| GPT-5.5 Pro | GPT-5.4 Pro | |
|---|---|---|
| Company | OpenAI | OpenAI |
| Released | Apr 24, 2026 ● | Mar 5, 2026 |
| Overall index | 162.5 ● | 159.1 |
| GPQA Diamond | — | 94.6% |
| FrontierMath | 87.7% ● | 82.5% |
| SimpleQA Verified | — | 46.3% |
| Input (per 1M tokens) | $30 | $30 |
| Output (per 1M tokens) | $180 | $180 |
| Cost for 1M input + 1M output tokens | $210 | $210 |
| Providers | 2 | 3 ● |
| Context | 1.1M | 1.1M |
| Max output | 128K | 128K |
| Inputs | Files, Image, Text | Text, Image, Files |
| Outputs | Text | Text |
| Reasoning | ✓ | ✓ |
| Tool use | ✓ | ✓ |
| Structured output | ✓ | ✓ |
| Open weights | — | — |