Opus 5.5 Ranks Among Smartest Models, Evaluator Says

Evaluator Aaron Bergman initially called Opus 5.5 possibly the smartest model with a slight edge in fluid reasoning, but later clarified it sits at roughly the same level as Astra and Fable 5.1 with no clear overall winner.

2026-09-23 ~ 2026-09-23 · 2 related posts

• Opus 5.5 tentatively the world's smartest model, though slightly behind on world knowledge — AaronBergman18 · 2026-09-23
• Follow-up: Opus 5.5 roughly on par with Astra and Fable 5.1, no clear winner — AaronBergman18 · 2026-09-23