Artificial Analysis Intelligence Index

Anthropic released two flagship models, Claude Fable 5.2 and Mythos 5.2, targeting the most demanding technical tasks just ahead of its IPO. Fable 5.2 tops the Artificial Analysis Intelligence Index v5 with 65 points, five ahead of Gemini 4 Carbon and 15 above its predecessor Fable 5.1, while still leading at lower compute tiers with 62 points and far fewer tokens. Anthropic says it deliberately withheld capabilities that could directly accelerate AI development.