Claude Fable 5 and Claude Mythos 5
… Without safeguards, Fable 5’s capabilities in areas like cybersecurity could be misused to cause serious damage. …
Search
Partnering with Mozilla to improve Firefox’s security
… From model evaluations to a security partnership In late 2025, we noticed that Opus 4.5 was close to solving all tasks in CyberGym , a benchmark that tests whether LLMs can reproduce known security vulnerabilities. …
2028: Two scenarios for global AI leadership
… With access to the model, Firefox was able to fix more security bugs last month than it had in all of 2025, and almost 20 times more than its monthly average security bug fixes in 2025. …
Introducing Claude Opus 4.7
… Security professionals who wish to use Opus 4.7 for legitimate cybersecurity purposes such as vulnerability research, penetration testing, and red-teaming are invited to join our new Cyber Verification Program . …