Ethan Mollick(@emollick):Model personality matters in a way that benchmarks can't capture. Opus models went through a rough patch from around 4.7 to 5 where they just didn't feel "Claude-y" anymore, more like an watered-down Fable (hmmm, teacher models?). Opus 5.5 feels like working with ol' Claude again

Ethan Mollick

@emollick

Professor @Wharton studying AI. New book, Co-Existence, coming October 20. Preorder here: Substack:

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Ethan Mollick@emollick

2026.09.27 02:42

Model personality matters in a way that benchmarks can't capture. Opus models went through a rough patch from around 4.7 to 5 where they just didn't feel "Claude-y" anymore, more like an watered-down Fable (hmmm, teacher models?). Opus 5.5 feels like working with ol' Claude again

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