Claude Fable 5 — Specifications
| Developer | Anthropic |
|---|---|
| Type | LLM (frontier reasoning) |
| Modality | Text, Vision → Text |
| Parameters | Undisclosed |
| Context window | 1M |
| Max output | 128K |
| License | Proprietary |
| Open weights | ❌ No |
| Released | 2026 |
| Input price | $10.00 /1M |
| Output price | $50.00 /1M |
| API providers | Anthropic, AWS |
Anthropic’s most capable widely released model, built for the most demanding reasoning and long-horizon agentic work. Thinking is always on; 1M context, 128K max output. Pricing exceeds the Opus tier.