the us government issued an export control directive requiring anthropic to suspend access to its most capable frontier models — referred to as fable 5 and mythos 5 — for non-us nationals, with mythos 5 described as too effective at offensive hacking for unrestricted distribution. on the same day, chinese lab z.ai open-sourced a 744-billion-parameter model under an mit license with no regional restrictions, benchmarking above gpt-5.5 on coding tasks at one-sixth the api cost. the same-day symmetry — us restricting access as china expands it — is structurally unusual as a policy moment.