@robinebers: Fable 5 Low > Opus 4.8 Max
Summary
A user posts a comparison suggesting Fable 5 Low outperforms Opus 4.8 Max, with another user commenting that Fable 5 is back but being used incorrectly.
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Cached at: 07/05/26, 02:33 PM
Fable 5 Low > Opus 4.8 Max
OrcDev (@orcdev): Fable 5 is back… but everyone’s using it wrong
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@corbin_braun: wait... Opus 5.5 is better than Fable 5.1? is this true @grok
A tweet questions if Claude Opus 5.5 outperforms Fable 5.1, referencing Cursor's announcement that Opus 5.5 is now available as the top model on CursorBench with 40% lower costs.
ProgramBench result for Fable 5 is in, doubling Opus 4.8 even with 4.8 fallback "99% of the runs"
ProgramBench results show Fable 5 achieving double the performance of Opus 4.8, even with fallback to 4.8 in 99% of runs.
Opus 5 isn't much cheaper than Fable to use
Opus 5 is not significantly cheaper to use than Fable.
@danshipper: This is wrong, it’s the same model But it does fall back to Opud 4.8 slightly more, so the benchmarks are measuring a m…
Dan Shipper argues that the Fable 5 model is not nerfed but falls back to Opus 4.8 more often, causing mixed benchmark results, contrary to claims of severe degradation.
Fable 5.1 is different!
Fable 5.1 is exceptional for scientific work, surpassing GPT 5.6 and Opus 5 based on user experience.