In the wake of Anthropic’s announcement of its latest artificial intelligence model, Mythos, on April 7, the company has stood by an unusual decision: refusing to release it to the public. Not since OpenAI temporarily withheld its GPT-2 model in 2019 has a major developer deemed a system too dangerous for the public. More than a week later, that choice is still reverberating through finance and regulatory circles.

 “The fallout—for economies, public safety, and national security—could be severe,”

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