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Anthropic's Fable 5 model criticized for frequent downgrades to lower-quality Opus 4.8

A user on Reddit reports issues with Anthropic's Fable 5 model, stating it frequently downgrades to the Opus 4.8 model, which they find to be of significantly lower quality. The user observed this behavior when asking about API specifications for a common open-source application used in public safety and military sectors. They argue that the model should not downgrade for such queries, as the information is publicly available and not sensitive. The user also notes a perceived degradation in Fable 5's code generation capabilities over time, rendering the model effectively useless for their work in security-related fields. AI

IMPACT User reports suggest potential quality control issues and performance degradation in Anthropic's Fable 5 model, impacting its usability for specific professional domains.

RANK_REASON User feedback on model performance and perceived quality degradation.

Read on r/Anthropic →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

Anthropic's Fable 5 model criticized for frequent downgrades to lower-quality Opus 4.8

COVERAGE [1]

  1. r/Anthropic TIER_1 English(EN) · /u/AndyHenr ·

    Problems with downgrading Fable 5 on innocuous questions

    <!-- SC_OFF --><div class="md"><p>I must state that while Fable 5 is a good model, it does now downgrade all the time to Opus 4.8 which conversely is an awful model, worse than 4.6. </p> <p>Now, to be specific, this was my very first question in the chain:<br /> &quot;can you loo…