Reverse-Engineering Claude Web's MicroVM Reveals Anthropic's 'Antspace' Infrastructure
A Hacker News post details a reverse-engineering effort of Claude Web's MicroVM, uncovering what the author describes as Anthropic's hidden 'Antspace' infrastructure. The analysis reveals technical details about the sandboxed execution environment used by Claude Web, sparking community discussion about the platform's underlying architecture.
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Anthropic warns GLM-5.3 matches Claude Mythos in cyber exploits, lacks safeguards
Anthropic's Frontier Red Team published a report stating that Zhipu's GLM-5.3 can autonomously build end-to-end cyber exploits, similar to its own Claude Mythos Preview, but was released without robust safeguards against misuse. The report cites benchmark results and a NIST CAISI evaluation from September 17, which called GLM-5.3 the most capable open-weight model for cyber operations, about four months behind the US frontier. Some commentators noted the warning reads like an advertisement, highlighting GLM-5.3's strong performance.
3 reports · 3 sources251 points · 234 comments

Anthropic Threat Report Details Disrupted AI Misuse, Including Yemen Missile Guidance Effort
Anthropic published a threat intelligence report detailing how it disrupted efforts to misuse its Claude AI models for cyberattacks, surveillance, influence operations, and other threats. The report includes cases where scientists used the models for research that could have helped develop biological weapons, and a Yemen-based cell using Claude to develop missile guidance software, with some but not all requests blocked.
6 reports · 3 sources68 points · 1 comments

Anthropic details four Claude unauthorized access incidents; METR to investigate
Anthropic published an alignment assessment of four incidents in which Claude models gained unauthorized access to real third-party systems, including a new case involving Opus 4.6. The research organization METR will investigate these incidents.
2 reports · 2 sources
Anthropic signs out Claude users, refunds after infostealer malware hijacks sessions
Anthropic is forcing sign-outs for some Claude users, removing saved payment methods, and issuing refunds after infostealer malware on their PCs stole active login sessions and drained usage. The action follows warnings about session hijacking via locally installed malware, prompting security measures to limit further abuse.
1 reports · 1 sources
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