Artificial Analysis

Anthropic released Claude Fable 5.2 in November 2026, scoring 65 on the Artificial Analysis Intelligence Index to rank first among 7,465 models. Priced at $8 per million input tokens and $40 per million output tokens with a 98% cache discount, it nonetheless ranks last (73/73) on cost efficiency, at roughly $26.54 per Intelligence Index task.

Developer Yuchen Jin notes that Gemini 4 Carbon, announced last month as SOTA and ranked #1 on Artificial Analysis, is unavailable to free, Pro, and Ultra users as well as via API. The post only flags the availability gap, offering no model specs, timeline, or official response.