gpt-4-turbo-preview vs Claude Fable 5.1
| OpenAI gpt-4-turbo-preview | Anthropic Claude Claude Fable 5.1 | |
|---|---|---|
| Vendor | OpenAI | Anthropic Claude |
| Context window | 128,000 | 1,000,000 |
| Max output | 4,096 | 128,000 |
| Reasoning | No | Yes |
| Tool calling | Yes | Yes |
| File input | No | Yes |
| Input | text | text, image, file |
| Output | text | text |
| Released | — | 2026-09-01 |