GPT-5.5 vs GPT-5.4 Pro
GPT-5.5 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
- GPT-5.5 is 6.0× cheaper than GPT-5.4 Pro for the same mix of input and output tokens.
- Both have the same context window.
- GPT-5.5 is the more recent release (Apr 24, 2026).
- Choose GPT-5.5 if cost matters most; choose GPT-5.4 Pro if you need its specific strengths above. For the best results, test both on your own prompts.
| GPT-5.5 | GPT-5.4 Pro | |
|---|---|---|
| Company | OpenAI | OpenAI |
| Released | Apr 24, 2026 ● | Mar 5, 2026 |
| Overall index | 159.3 ● | 159.1 |
| GPQA Diamond | 90.7% | 94.6% ● |
| AIME math | 84.4% | — |
| FrontierMath | 85.3% ● | 82.5% |
| SimpleQA Verified | 63.0% ● | 46.3% |
| Input (per 1M tokens) | $5 ● | $30 |
| Output (per 1M tokens) | $30 ● | $180 |
| Cost for 1M input + 1M output tokens | $35.00 ● | $210 |
| Providers | 7 ● | 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 | — | — |