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Anthropic rolls out Claude Fable 5, but it's available for a limited time

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Anthropic has begun rolling out a new model called "Fable," which is based on the same underlying model as Mythos, its most powerful AI model class.

Anthropic previously said that it developed a model called "Mythos," which is a state-of-the-art model that poses security risks to companies around the world.

At that time, Anthropic noted that Mythos was powerful enough to potentially help bad actors attack public and private software.

"The advantage will belong to the side that can get the most out of these tools," Anthropic warned in April when it announced the Mythos model.

"In the short term, this could be attackers, if frontier labs aren’t careful about how they release these models. In the long term, we expect it will be defenders who will more efficiently direct resources and use these models to fix bugs before new code ever ships."

In other words, it could have been abused to find and exploit vulnerabilities in apps like Firefox.

Because of those risks, Anthropic decided to limit access to models like Mythos and offer them only to cybersecurity experts and trusted companies.

Now, Anthropic says it has developed strong guardrails for the same model class, which means these powerful AI models can no longer be easily exploited by bad actors.

As a result, it's launching a safer version called "Fable 5."

Claude Code now shows Fable 5 model

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