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The same model now exists twice — one version anyone can use, one version almost nobody can. Here’s what Fable 5 actually is, in plain English, and why the split matters. #
The strangest AI launch of 2026 so far goes like this: on June 9, Anthropic released its most powerful model ever to the public. Three days later, the US government hit it with export controls and it vanished for everyone. On July 1 — two days ago, as I write this — it came back.
That model is Claude Fable 5, and even without the drama, it would be worth understanding, because it’s built on an idea no major lab has shipped at this scale before: the same underlying model, released twice, under two names, with two very different sets of rules.
I’ve been using it since access was restored, and I want to explain what it actually is — the capability, the unusual safety design, the catches — the way I’d explain it to a colleague. No hype, sources for every claim, and the honest caveats included.
First: what is Fable 5? #
Until last month, Anthropic’s model family had three tiers — Haiku, Sonnet, and Opus, in…