Good day. Anthropic is releasing a next-generation “Mythos-class” model to the general public, with guardrails that remove dangerous capabilities in areas such as cybersecurity.

Called Claude Fable 5, the large language model will primarily allow users to query Mythos, which the company previously deemed too dangerous for general release. However, if users ask Fable about sensitive issues such as a bioweapon or exploiting a software bug, it will kick them back to the older Opus 4.8 version of the Claude chatbot.

Hackers are likely to try to trick Mythos into answering these questions, despite Anthropic’s controls—a process known as jailbreaking—but the company says it has done extensive testing to make that harder to pull off.

Since it was announced in April, Mythos has caused the Trump administration to re-evaluate its artificial-intelligence policy and spooked cybersecurity experts, many of whom say that Mythos and other advanced AI models are now producing an avalanche of bug reports.

Read our full story here.

I'm interested in hearing your thoughts on the frontier-model frenzy; feel free to let me know at james.rundle@wsj.com.

Also today:

• Lawmaker proposes MS-ISAC funding.
• CISA filling jobs.
• Check Point zero day warnings.

CISA Chief Says Agency Making Progress on Hiring and AI Efforts. Acting Director Nick Andersen said the Cybersecurity and Infrastructure Security Agency expects to make about 180 tentative job offers by the end of June as it works to fill 329 mission-critical positions. Andersen also highlighted work on an AI initiative to help agencies better use AI in defensive cybersecurity operations. (Federal News Network)

Check Point Warns on VPN Zero-Day. Check Point Software Technologies warned that a zero-day vulnerability in its own VPN deployments has been exploited since early May, including by a ransomware affiliate. The company urged customers to apply fixes and check for signs of compromise tied to the flaw. (Cybersecurity Dive)

Louisiana Fire District Sues Cybersecurity Firm Over 2023 Hack. The St. George Fire Protection District sued Baton Rouge, La.-based General Informatics, alleging the company failed to properly secure its network, leaving systems vulnerable to a 2023 cyberattack. The lawsuit claims the firm was hired to prevent such incidents and seeks damages related to the breach and its aftermath. (WBRZ)

The WSJ Pro Cybersecurity team is Deputy Bureau Chief Kim S. Nash and reporters Angus Loten, and James Rundle. Follow us on X @WSJCyber. Reach the team by replying to any newsletter you receive or by emailing Kim at kim.nash@wsj.com.