Claude Fable 5.2 and Mythos 5.2 retake the AI performance lead ahead of Anthropic's IPO

Claude Fable 5.2 and Mythos 5.2 cement Anthropic's AI lead just before its IPO

Anthropic's Claude Fable 5.2 and Mythos 5.2 have retaken the AI performance lead. Fable 5.2 scores 65 on the Artificial Analysis Index v5 at its highest compute tier.

Why it matters: Fable 5.2 leads rivals on the composite benchmark, but at the top compute tier a task costs about 2.6 times as much as on Opus 5.5.