GPT-5.1 vs gpt-4o
| OpenAI GPT-5.1 | OpenAI gpt-4o | |
|---|---|---|
| Vendor | OpenAI | OpenAI |
| Context window | 400,000 | 128,000 |
| Max output | 128,000 | 16,384 |
| Reasoning | Yes | No |
| Tool calling | Yes | Yes |
| File input | Yes | Yes |
| Input | text, image | text, image |
| Output | text | text |
| Released | 2025-11-12 | 2024-05-13 |