I Tested Fable 5.2 vs Opus 5.5 on 5 Real Use Cases
Peter Yang tests Fable 5.2 against Opus 5.5 on five real tasks, from a 3D travel video to writing and pushback, finding Fable mostly better but Opus surprisingly more willing to hold its ground.
The gist
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Peter says Fable's code-built 3D travel video of Kyoto's Fushimi Inari Shrine and its kart racer game looked more polished and detailed than Opus's.
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For his website redesign, Peter preferred Fable's bold design, but says both conversion-focused versions had too much text, so he prefers his current site.
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In a blind test of five essays each, Peter picked Fable four of five times, noting Opus reused the same lawyer story in every essay.
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Opus held its ground better than Fable against emotional pushback and a false fact, while both resisted plain disagreement and social proof.
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Peter adds rules to agents.md, like be candid and avoid AI slop phrases, and says both models then stop slop and push back more.
Peter Yang uses it
"Now, Opus is already incredibly strong at 3D videos... What I found is that Opus held its ground more than Fable... So in this case, Opus actually held its ground a lot more than Fable."
▶ Play at 2:47251 creators recommend it, including Riley Brown, Chris Koerner, and This Week in Startups.
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Peter Yang recommends it
"I find that if I add this stuff to agents.md or claude.md, so every conversation starts with this prompt, both models basically completely stop producing AI slop phrases and are willing to stand their ground a lot more as well. So definitely check out this prompt."
▶ Play at 19:04What they recommend · 2 picks
"Now, Opus is already incredibly strong at 3D videos... What I found is that Opus held its ground more than Fable... So in this case, Opus actually held its ground a lot more tha..."
"I find that if I add this stuff to agents.md or claude.md, so every conversation starts with this prompt, both models basically completely stop producing AI slop phrases and are..."
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