Overview
- Anthropic said late Friday that it had disabled Fable 5 and Mythos 5 after the U.S. government ordered the company to block access for any foreign national under export-control rules.
- Mythos 5 and Fable 5 are Anthropic’s state-of-the-art models and Mythos is noted for its ability to find computer-security flaws, which U.S. officials cited as a dual-use national security concern.
- Anthropic told customers it could not reliably enforce nationality-based limits and therefore turned the models off for all users while it seeks clarification from authorities.
- Other Anthropic models remain available and the move adds to existing legal and regulatory fights that include a Pentagon supply-chain designation and a pending company lawsuit and SEC filing.
- The order signals a broader push by the administration to scrutinize frontier AI releases and could affect corporate product rollouts, global customers, and Anthropic’s near-term business plans.