GPT-5.5 Pro vs Gemini 3.7 Flash
GPT-5.5 Pro vs Gemini 3.7 Flash: which AI model is cheaper, has the larger context window and more capabilities? Side-by-side comparison updated daily.
Quick verdict
- Gemini 3.7 Flash is 45× cheaper than GPT-5.5 Pro for the same mix of input and output tokens.
- GPT-5.5 Pro has the larger context window (1.1M), useful for long documents and big codebases.
- Gemini 3.7 Flash is the more recent release (Aug 13, 2026).
- GPT-5.5 Pro scores higher on independent tests (overall index 162.5 vs 157.7).
- Choose Gemini 3.7 Flash if cost matters most; choose GPT-5.5 Pro if you need its specific strengths above. For the best results, test both on your own prompts.
| GPT-5.5 Pro | Gemini 3.7 Flash | |
|---|---|---|
| Company | OpenAI | Google DeepMind |
| Released | Apr 24, 2026 | Aug 13, 2026 ● |
| Overall index | 162.5 ● | 157.7 |
| GPQA Diamond | — | 94.8% |
| AIME math | — | 97.2% |
| FrontierMath | 87.7% ● | 71.6% |
| SimpleQA Verified | — | 69.2% |
| Input (per 1M tokens) | $30 | $0.75 ● |
| Output (per 1M tokens) | $180 | $3.75 ● |
| Cost for 1M input + 1M output tokens | $210 | $4.50 ● |
| Providers | 2 | 6 ● |
| Context | 1.1M ● | 1M |
| Max output | 128K ● | 64K |
| Inputs | Files, Image, Text | Text, Image, Video, Files, Audio ● |
| Outputs | Text | Text |
| Reasoning | ✓ | ✓ |
| Tool use | ✓ | ✓ |
| Structured output | ✓ | ✓ |
| Open weights | — | — |