Claude Mythos 5

The Department of Commerce withdrew the export controls that had made Anthropic's top models unavailable for weeks. The leaked withdrawal letter, addressed to Anthropic's Chief Compute Officer, lists the commitments made: proactively detect security risks and inform the government of any malicious activity.

The thread was more wary than relieved: readers asked how lobotomized the returning model will be, and whether you can build a business on a US frontier model that vanishes for two months on a policy whim.

theahura argues the suspension's motive almost doesn't matter. Whether it's safety, an IPO stunt, or Trump settling a score, a line was crossed: a government unilaterally pulled the best LLM off the market.

His sharpest worry, echoed back at him in the thread: in two years, the strongest models may not be available for general use at all, no matter whose flag they fly under.

The US government cited national security and ordered Anthropic to cut off all foreign access to its two strongest models. Anthropic says the only evidence it received was verbal, and the demonstrated technique was the same one defenders use daily: have the model read code and fix the bugs.

The 1,800-comment thread split four ways: deserved comeuppance for safety hype, a Trump-admin revenge move, free pre-IPO marketing, and a precedent that could freeze every frontier lab at once.

The pitch is a role change — judge the finished work, don't drive the process. One project ran nine and a half hours nearly unattended.

Practitioners flipped it: their customers are begging for sub-20-second agents, so a 9.5-hour run is a warning, not a wonder.

And the showcased travel-time map, checked against Google Maps, routed people down roads that don't exist.

Anthropic put one model behind two doors. Mythos 5 is the full-capability version for ultra-vetted clients; Fable 5 is the public one, wired to safety classifiers that silently route flagged queries to the weaker Opus 4.8 rather than refusing outright.

The benchmark jump is real on paper, but the loudest voice in the thread runs a bug-bounty program and isn't celebrating: he's watching for the day low-effort fuzzing turns into a real security edge.

And the 'free until June 22' rollout reads to many as a hook before usage-based billing arrives.