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What can it do that Opus couldn’t?
Always hard to say for sure because I'm not sitting around running the exact same situations through both models in parallel to compare them.

It feels like you can give it a big chunky problem and leave it alone and it gets it done, with less questions and fewer design decisions that I wouldn't have made.

In reviewing its code I'm finding less to complain about than Opus. But it's all vibes, if you want a more scientific comparison you'll have to look elsewhere.

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I did a qualitative side-by-side of Claude Fable vs Opus 4.8 vs ChatGPT 5.5

https://generative-ai.review/2026/06/claude-fable-rush-test-...

I get them to make a 3D explainer animation. You can clearly see Fable is much improved on both Opus 4.8 and ChatGPT 5.5.

Better Textures . A nifty camera follow . Humans rendered better . ... see for yourselves