Gemini 3.1 Pro Preview vs gpt-5.1-codex
| Google Gemini 3.1 Pro Preview | OpenAI gpt-5.1-codex | |
|---|---|---|
| Vendor | OpenAI | |
| Context window | 1,048,576 | 400,000 |
| Max output | 65,536 | 128,000 |
| Reasoning | Yes | Yes |
| Tool calling | Yes | Yes |
| File input | Yes | Yes |
| Input | text, image, video, audio, file | text, image |
| Output | text | text |
| Released | 2026-02-19 | 2025-11-13 |