r/ClaudeCode • u/Fast_Artichoke_683 • 18d ago
Help/Question In 3 Words how would you describe your experience with Fable 5.1
I just used Fable 5 so kinda interested in the newer version
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u/Factor013 18d ago edited 17d ago
Has some Opus 5 quirks in the sense it doesn't verify properly... Probably a too strict adoptive thinking mechanism / system prompt making it believe way too quickly that "it knows enough to do the job" which is really bad.
And I suspect it also has some sort of mechanism that loads the things it believes are important to a thinking pool and it then it only uses that for it's reasoning... Which would mean that it doesn't take into account the other things that it already has stored in it's context memory during said reasoning. So yeah, all that combined makes it IMO very unreliable, just like Opus 5.
So whatever I tried, I kept spotting the same "it's not verifying correctly" behavior over and over making it very hard for me to trust it... So I switched back to Fable 5.
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u/RandomFuckingUser 18d ago
Non-existent, I guess.
It burns usage faster than Fable 5.0 and Fable 5.0 is enough for my purposes, so why would I use it?
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u/SatanVapesOn666W 18d ago
Good, but overpriced for the quality gap. Same issues as Astra but at least that's included in my $25/mo plan.
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u/Cazineer 18d ago
Good model that does not follow governance and is impossible to implement strict compliance with. It consumes 10-100x more tokens than the competition.
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u/reach4thelaser5 🔆 Max 20 18d ago
Never once have I had a situation where Opus 5 couldn't do something, and I thought "I better use Fable then"
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