US government lifts export controls on Anthropic Fable 5 and Mythos 5 models with security testing requirement

According to Wired and Ars Technica, the Trump administration has lifted export restrictions on Anthropic's frontier AI models Fable 5 and Mythos 5 after three weeks of disruption caused by cybersecurity capability concerns. The reversal includes a requirement that Anthropic implement additional security testing measures on the models before global release. The conditional lifting allows Anthropic to distribute the models internationally while maintaining government oversight of frontier AI safety.