Anthropic restored its Fable 5 model after a 19-day export control blackout, but the model returned with restrictions and degraded performance on some tasks.
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Anthropic's Fable 5 model, released in late June as the company's most capable AI, was taken offline for 19 days after the U.S. government imposed export controls. When it returned on July 1, the model was not the same. Developers who tested the restored version said it now operates under usage caps and, on certain prompts, routes requests to a less capable model without notifying the user. Anthropic did not confirm the changes or disclose which prompts trigger the downgrade.
The export control order, issued by the Bureau of Industry and Security, marked the first time the U.S. restricted access to a specific AI model. The order cited national security concerns tied to Fable 5's performance on cybersecurity and code-generation benchmarks. Anthropic said at the time it was complying with the order and working to bring the model back into compliance. The company did not say what modifications were required.
The restored model carries a metered usage tier. API calls are capped at a fraction of the original throughput, and certain high-risk prompts are redirected to an older model, Claude 3.5 Sonnet, according to two developers who tested the restored API. Anthropic's documentation does not mention the redirection. The company declined to comment on the specific changes.
The episode has implications for companies that build products on top of frontier models. Startups that integrated Fable 5 into their workflows during the 72-hour window before the ban had to scramble for alternatives. Some switched to OpenAI's GPT-4o or Google's Gemini. Others paused development. The uncertainty around future export controls adds a layer of regulatory risk that was not priced into AI infrastructure stocks, several venture investors said.
Anthropic has not said when Fable 5 will return to its original capability or whether the restrictions are permanent. The company is scheduled to report its next safety assessment to the Commerce Department in August. Until then, developers using the model face a version that is weaker than advertised, with no guarantee of when – or if – the full version will come back.
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