Gemini 3.1 Pro Preview Customtools vs GPT Image 2 Develop
| Google Gemini 3.1 Pro Preview Customtools | OpenAI GPT Image 2 Develop | |
|---|---|---|
| Vendor | OpenAI | |
| Context window | 1,048,576 | 128,000 |
| Max output | 65,536 | — |
| Reasoning | Yes | No |
| Tool calling | Yes | No |
| File input | Yes | Yes |
| Input | text, image, video, audio, file | text, image |
| Output | text | image |
| Released | 2026-02-19 | 2026-04-19 |