Claude Fable 5 vs gpt-5-chat-latest
| Anthropic Claude Claude Fable 5 | OpenAI gpt-5-chat-latest | |
|---|---|---|
| Vendor | Anthropic Claude | OpenAI |
| Context window | 1,000,000 | 400,000 |
| Max output | 128,000 | 128,000 |
| Reasoning | Yes | Yes |
| Tool calling | Yes | Yes |
| File input | Yes | Yes |
| Input | text, image | text, image |
| Output | text | text |
| Released | 2026-06-08 | 2025-08-07 |