GPT-5.5 vs gemini-2.5-pro
| OpenAI GPT-5.5 | Google gemini-2.5-pro | |
|---|---|---|
| Vendor | OpenAI | |
| Context window | 1,050,000 | 1,048,576 |
| Max output | 128,000 | 65,536 |
| Reasoning | Yes | Yes |
| Tool calling | Yes | Yes |
| File input | Yes | Yes |
| Input | text, image | text, image, audio, video, file |
| Output | text | text |
| Released | 2026-04-24 | 2025-03-20 |