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Ethan Mollick tests Anthropic's Opus 5, notes Fable-like quirks

Ethan Mollick has shared his experiences testing Anthropic's Opus 5 model, noting its general strength across various tasks. However, he observed that Opus 5 exhibits some peculiar language quirks, similar to those found in the Fable model, particularly in its density and use of FableSpeak. While Opus 5 can perform comparably to Fable on shorter tasks, Mollick found it less ambitious and complete on longer assignments. AI

IMPACT Provides user-level feedback on a new model's performance and quirks, informing potential users.

RANK_REASON User commentary on a model release, not a direct announcement from the lab.

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AI-generated summary · Google Gemini · from 2 sources. How we write summaries →

Ethan Mollick tests Anthropic's Opus 5, notes Fable-like quirks

COVERAGE [2]

  1. Bluesky Jetstream — AI desk TIER_1 English(EN) · emollick.bsky.social ·

    In my testing, Opus 5 replaced Opus 4.8 for me, it was generally stronger in everything... except it shares some of the weird language quirks of Fable, includin

    In my testing, Opus 5 replaced Opus 4.8 for me, it was generally stronger in everything... except it shares some of the weird language quirks of Fable, including a love of density and FableSpeak. I had it make a game where you build railroads in knock-off Middle Earth: perilous-…

  2. Bluesky Jetstream — AI desk TIER_1 English(EN) · emollick.bsky.social ·

    I had access to Opus 5 before release and found it to be a good model if a quirky one. On shorter tasks, it could match or beat Fable levels of performance, at

    I had access to Opus 5 before release and found it to be a good model if a quirky one. On shorter tasks, it could match or beat Fable levels of performance, at longer tasks it seemed less ambitious & would not deliver as complete a set of work. Here is its neo-gothic shader.