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Users report Fable 5 performance decline weeks after launch

mlmonkey reports massive performance drop week 1 to week 8

A heavy user of frontier models describes a dramatic performance decline from week 1 to week 8 after launch, with the model transitioning from capable research assistant to eager but less capable tool.

mlmonkey reports massive performance drop week 1 to week 8
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“the drop in performance from, say, week 1 to week 8 is often massive”

mlmonkey

Waterluvian Fable 5 userjotato gpt-5.6-luna usermlmonkey Frontier model researchertheplumber Claude userrcr-anti Claude Code tracker

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Peak 11 pieces in two hours at Sep 21, 11 AM; 31 pieces over 5 days (2 articles · 2 posts · 27 comments) Sep 21, 11 AM — 11 pieces · 2 articles · 1 post · 8 comments — Hacker News 9, Newswires 2Sep 21, 1 PM — 6 pieces · 6 comments — Hacker News 6Sep 21, 3 PM — 3 pieces · 1 post · 2 comments — Hacker News 2, Mastodon 1Sep 21, 5 PM — 5 pieces · 5 comments — Hacker News 5Sep 21, 7 PM — 2 pieces · 2 comments — Hacker News 2Sep 21, 9 PM — 1 piece · 1 comment — Hacker News 1Sep 21, 11 PM — quietSep 22, 1 AM — 1 piece · 1 comment — Hacker News 1Sep 22, 3 AM — quietSep 22, 5 AM — quietSep 22, 7 AM — quietSep 22, 9 AM — 1 piece · 1 comment — Hacker News 1Sep 22, 11 AM — quietSep 22, 1 PM — quietSep 22, 3 PM — quietSep 22, 5 PM — quietSep 22, 7 PM — quietSep 22, 9 PM — quietSep 22, 11 PM — quietSep 23, 1 AM — quietSep 23, 3 AM — quietSep 23, 5 AM — quietSep 23, 7 AM — quietSep 23, 9 AM — quietSep 23, 11 AM — quietSep 23, 1 PM — quietSep 23, 3 PM — quietSep 23, 5 PM — quietSep 23, 7 PM — quietSep 23, 9 PM — quietSep 23, 11 PM — quietSep 24, 1 AM — quietSep 24, 3 AM — quietSep 24, 5 AM — quietSep 24, 7 AM — quietSep 24, 9 AM — quietSep 24, 11 AM — quietSep 24, 1 PM — quietSep 24, 3 PM — quietSep 24, 5 PM — quietSep 24, 7 PM — quietSep 24, 9 PM — quietSep 24, 11 PM — quietYesterday, 1 AM — quietYesterday, 3 AM — quietYesterday, 5 AM — quietYesterday, 7 AM — quietYesterday, 9 AM — quietYesterday, 11 AM — quietYesterday, 1 PM — quietYesterday, 3 PM — 1 piece · 1 comment — Hacker News 1Yesterday, 5 PM — quietYesterday, 7 PM — quietYesterday, 9 PM — quietYesterday, 11 PM — quietToday, 1 AM — quietToday, 3 AM — quietToday, 5 AM — quietToday, 7 AM — quietToday, 9 AM — quiet 1–6
Sep 22Sep 23Sep 24yesterdaynow · 11:48 AM ET

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