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Fable 5 – Median thinking declined in August

428 points · 293 comments · espeed

  1. Waterluvian · · focus · HN ↗
    I have no hard data but I have a strong feeling this morning that something's wrong with Fable 5 compared to Friday evening.

    Just an hour ago I had Fable correctly identify an unused method that could be deleted. I then immediately get a diff for an exact duplicate method, and then Fable outputting, "I accidentally duplicated <method> instead of deleting it. Removing both copies now."

    The remaining morning complaints that makes it feel like something's off is that it will do a lot of "thinking" for simple things that previously took very little time. And it got very lost and completely mixed up DE-91M predicate names and implementations. Just absolute disaster code that I had over the past months come to generally expect it to do without issue.

    Glad I carefully review everything. I think what I need is reliability and consistency. But it feels like picking a model from the list doesn't guarantee that: that the models' "brain" is open on the table and they're screwing with it.

    1. prodigycorp · · focus · HN ↗
      New release of fable and opus 5.5 is pending and Anthropic is reallocating resources. Degradation always happens in transition, it sucks.

      Opus 5.5 is being served under opus 5 right now.

      1. pllbnk · · focus · HN ↗
        It shouldn’t be an excuse. They are selling a product and that product should always be within the quality range.
        1. user43928 · · focus · HN ↗
          And it's not. A conspiracy theory is what it is.

          I have no reason to doubt the claims of the employees at OpenAI and Anthropic who have told us personally multiple times, including here on HN, that they do not degrade the models in order to reduce load.

          As for the endlessly long analysis in the OP, it appears it's based on analyzing their random usage data rather than any fixed benchmark. I don't think it makes much sense.

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