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Anthropic Opus 5 users report unexpected Fable model execution

A user reported an issue where Anthropic's Opus 5 model appeared to be running the Fable model instead, despite the interface indicating Opus 5 was selected. The user observed duplicate entries for Opus 5 in the model selection dropdown, with one entry seemingly causing the Fable model to execute and consume quota unexpectedly. The user has opened a support ticket to investigate this discrepancy. AI

IMPACT Potential confusion for users regarding model performance and billing due to interface discrepancies.

RANK_REASON User-reported bug in a specific model version.

Read on r/Anthropic →

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

Anthropic Opus 5 users report unexpected Fable model execution

COVERAGE [1]

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

    It said opus but it ran Fable

    <!-- SC_OFF --><div class="md"><p>I have an interesting problem. I have it set to opus 5 and I've been doing all these and then it suddenly told me that I'm at 83% of my fable quota. But I hadn't been using Fable except for a few things so 83% didn't make sense, maybe 25%. </p> <…