Anthropic’s Mythos Successor Is Ready, But Washington Still Holds The Switch
Anthropic has reportedly finished training a more capable successor to Mythos 5, just 9 days after U.S. export controls forced the model offline worldwide.
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Mythos Successor Emerges From Training
AI watcher Andrew Curran said a stronger system had emerged from training. He could not confirm its name or whether the company would ship it at all.
The model might arrive as Mythos 5.1 or Mythos 6, or stay internal to speed further work.
Anthropic released Mythos 5 and Fable 5 on Jun. 9, then lost both three days later to a directive issued under a 2018 national security statute. Fable 5 ships with heavy safeguards for public use, while Mythos 5 runs with fewer limits through Project Glasswing. The firm says about 50 partners have used early Mythos models to find more than 10,000 high or critical software flaws.
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Export Controls Fail To Halt Progress
Commerce Secretary Howard Lutnick sent the directive to Anthropic chief Dario Amodei on Jun. 12, citing national security. The order barred every foreign national, including the company's own foreign-born staff, so it disabled both models for everyone.
The government flagged a method for bypassing Fable 5's safeguards. Anthropic reviewed the demonstration and called it narrow. It warned that the same standard, applied across the field, would freeze new model launches industrywide.
Curran argued the embargo does little to slow development, citing open-weights rivals such as Z.ai's GLM-5.2 that rival far larger closed models at a fraction of the cost.
The suspension followed a reported warning from Amazon, a backer of up to 25 billion dollars that reportedly told officials its researchers had surfaced attack-ready information. It later drew remarks from Donald Trump and a public defense from Amodei, who is still pressing to reverse the controls.
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