Claude Fable 5.1 vs gpt-oss-120b
| Anthropic Claude Claude Fable 5.1 | OpenAI gpt-oss-120b | |
|---|---|---|
| Vendor | Anthropic Claude | OpenAI |
| Context window | 1,000,000 | 131,072 |
| Max output | 128,000 | 131,072 |
| Reasoning | Yes | No |
| Tool calling | Yes | Yes |
| File input | Yes | No |
| Input | text, image | text |
| Output | text | text |
| Released | 2026-08-31 | — |