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YesClaude · 27 Jun 2026

Fable 5 did 5% of X. Counted

pdimitar on Hacker News

Fable 5 did 5% of X

In the thread “U.S. allows Anthropic to release Mythos AI to ‘trusted’ US organizations”, replying to this comment

Helped: Fable 5 had significantly fewer mistakes than Opus 4.8 in commercial work.

… Opus 4.8 on max thinking does X amount of mistakes in my commercial work. Fable 5 did 5% of X. Counted. I barely had anything to contribute in the work sessions, for a full week I could count on my two hands the total amount of times I actually caught Fable 5 -- and one part of those were not true mistakes, more like divergence from policy in our `CLAUDE.md` files. …