o4-mini vs Claude Fable 5
| OpenAI o4-mini | Anthropic Claude Claude Fable 5 | |
|---|---|---|
| Vendor | OpenAI | Anthropic Claude |
| Context window | 200,000 | 1,000,000 |
| Max output | 100,000 | 128,000 |
| Reasoning | Yes | Yes |
| Tool calling | Yes | Yes |
| File input | Yes | Yes |
| Input | text, image | text, image |
| Output | text | text |
| Released | 2025-04-16 | 2026-06-08 |