Introducing Claude Fable 5

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Today we're launching Claude Fable 5,

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the most capable model we've ever

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released to the public. Fable 5 is a

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Mythos class model with safeguards that

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make it ready for general use. We didn't

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broadly release our previous model with

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this level of capability because when we

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finished training and testing it,

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[music] we saw that the model, Claude

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Mythos preview, was finding thousands of

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cybersecurity vulnerabilities.

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A model that can find flaws like that

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can also [music] be used to exploit

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them. So instead of releasing it, we

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handed it to the people who protect

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[music] the world's critical software

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and put it to work fixing the holes

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before someone could break through them.

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It was the right call for the moment,

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but it was never the goal. We believe

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powerful AI should be safe and [music]

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accessible. That's why we went to work

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on Claude Fable 5.

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>> Every Claude model has safeguards to

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keep it from doing harm. Fable needed

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more cautious ones than anything we'd

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built before. Our safety systems for

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Fable 5 automatically [music] review

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requests that touch on high-risk areas

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like cybersecurity or biology. Those

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requests are then redirected to Opus

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4.8. [music] We do that intentionally so

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people can continue to benefit from the

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capabilities of a powerful model like

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Fable without the cyber and biology

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risks that come with it. The safeguards

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are broad today, but we'll keep refining

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them so that they're better at allowing

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safe requests.

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>> We built Claude Fable 5 for your most

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ambitious [music] work. It can stay with

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a problem far longer than any model

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before it. It's highly autonomous and

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can operate for days without

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intervention. And it's not just coding.

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It can take on projects in finance,

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research, economics, law, complicated

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tasks that used [music] to need constant

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supervision. So point it at something

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that matters.

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What's the problem we'll look back on

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and wonder why it took so long to solve.

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We know what Claude Fable 5 can do. The

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interesting part is what you'll do with

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it.

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>> [music]

Interactive Summary

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Claude Fable 5 is the latest and most capable Mythos class model released to the public, designed to be powerful yet safe for general use. Unlike its predecessor, which was restricted due to cybersecurity risks, Fable 5 incorporates advanced safety systems that redirect high-risk queries to the Opus 4.8 model. It is built to handle ambitious, long-term, and autonomous projects across various professional fields like finance, research, and law.