Anthropic's proprietary reasoning model Claude Fable 5.2 (Max, Default Fallback), released November 9, 2026, achieved a score of 65 on the Artificial Analysis Intelligence Index, substantially above the median of 40 for comparable models. The model supports text and image input with text output across a 1M-token context window. Evaluation on the Intelligence Index generated 275M output tokens, far exceeding the 72.8M median, indicating high verbosity. Performance is notably slow: 46.4 minutes per task versus a 12.7-minute median, with time to first answer token at 215.95 seconds against an 11.78-second median. Pricing is premium at $8.00 per 1M input tokens and $40.00 per 1M output tokens, compared to medians of $2.00 and $10.00 respectively; a blended 7:2:1 cache-hit/input/output ratio yields $5.74 per 1M tokens. Average cost per Intelligence Index task reaches $26.54. The model is available via a single API provider; parameter count remains undisclosed.