‘Oh God, no! Not another thing:’ What Anthropic’s Mythos-class Fable 5 means for CEOs trying to govern AI

In today’s CEO Daily: CEOs grapple with the ever-changing rules of AI.

The big leadership story: Employers face H-1B visa fee chaos.

The markets: Mostly up as markets’ wild week continues.

Plus: All the news and watercooler chat from Fortune.

Good morning. I was speaking with a CEO in financial services this week when I noticed and mentioned that Anthropic had just released its first Mythos-class model to the public. His reaction: “Oh God, no! Not another thing.” Neither of us knew the details yet, beyond the now disputed claim that Claude Fable 5 is a better way to let users query a model deemed too dangerous for general release. To him, that didn’t matter. “I’m not worried about someone making a weapon,” he told me. “I’m worried about all the other crap we now have to think about.”

That reaction captures something every CEO needs to grapple with as the rules of the road on AI keep changing and the companies writing them don’t seem to answer to anyone but themselves. Anthropic’s rollout of Claude Fable 5 is a case study in the new reality of AI adoption, creating new challenges along with new capabilities. 

To start, there’s the trade-off of having Fable 5 automatically block responses in areas like cybersecurity and even limit the capabilities of AI researchers and developers. (The unfettered version—Claude Mythos 5—is available only to pre-approved organizations to address cybersecurity issues.) Another problem is that the model holds back covertly: no red flag or transparency about triggers, so users don’t know when they’re being served up subpar content. They just know from the system card that it could happen any time.

Then........

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