Earlier this week, Anthropic released its most powerful public model yet: Claude Fable 5. This model is the "safe" version of an even more powerful model, Mythos, that Anthropic has yet to release to the public due to potential dangers.Just days later, the Trump administration issued an export control directive barring the use of Fable 5 from foreign nationals. As a result, Anthropic was forced to disable Fable 5 for all its customers to comply with the order.
In a statement, Anthropic said it believed the order was issued by the U.S. government to use a method to "jailbreak" Fable 5 to identify vulnerabilities. Anthropic claimed in its statement that other AI models could do the same without a bypass. The company specifically named GPT 5.5, the latest AI model from its biggest competitor, OpenAI, as one such model.
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There are currently too many unknown variables to determine if this is accurate. However, Mashable was preparing a piece comparing Anthropic's Claude Fable 4 and OpenAI's GPT 5.5 prior to the Trump administration's order.It appears the U.S. government's concerns could be related to just how powerful Claude Fable 5 appears to be, even with its safeguards.Here's how Fable 5 stacked up against GPT 5.5.Claude Fable 5 vs GPT 5.5: Feature setAccording to Anthropic, "Fable 5’s capabilities exceed those of any model we’ve ever made generally available." "It is state-of-the-art on nearly all tested benchmarks of AI capability, showing exceptional performance in software engineering, knowledge work, vision, scientific research, and many other areas," Anthropic says. "The longer and more complex the task, the larger Fable 5’s lead over our other models."When GPT 5.5 rolled out in late April, OpenAI said that the model had improved on its "agentic coding, computer use, knowledge work, and early scientific research" capabilities.
