Fable 5 was beating GPT 5.5 on every major benchmark. Then the US government pulled it offline.
SMRTR summary
Anthropic's Fable 5 dominated every major AI benchmark, outperforming GPT 5.5 by 22 points on real-world coding tasks, before the US government ordered it offline after just three days, citing a jailbreak vulnerability. GPT 5.5 now holds the top spot by default, not by merit.
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