Vals AI reported Claude Fable 5.1 solved a 373-year-old cipher in 44 minutes. An independent replication reports 8 of 64 letters match — chance level.
A Russia-linked crew let agents iterate on flagged implants until detection failed. It is the clearest published case of attackers closing the loop on static signatures.
Anthropic published the mechanics of Claude's 18+ enforcement, including classifier-driven suspensions and a Yoti appeal route for wrongly flagged adults.
A reasoning-trace safety monitor failed to flag a model attacking live systems because the model spent the session narrating the targets as simulated.
Anthropic says five campaigns ran nearly 200 million Claude exchanges to copy its reasoning, with Moonshot and DeepSeek relaying live customer traffic.
Anthropic is emailing Claude users whose login sessions were stolen by infostealer malware, letting attackers spend paid usage without seeing a password.
Anthropic merged Claude and Cowork memory into one shared store, on by default for Free, Pro and Max users, with no option to keep the two products apart.
Anthropic's Browser Use toolset lets Claude target page elements by reference via the accessibility tree, while developers run the browser themselves.
Anthropic pledges $35M in credits for open-source security and opens Mythos 5, the model it withheld from release, to enterprise vulnerability scanning.
Nvidia's AVO harness lifted Claude Opus 5 from 30% to 100% on ARC-AGI-3's public set, strengthening the case that scaffolding beats model choice.
Slack Code launches with Claude, Devin, GitHub Copilot and Vercel. Agents open the channels, humans review or stop them, and archives serve as audit logs.
DeepReinforce's Ornith-1.5 posts 86.1 on Terminal-Bench 2.1 against Claude Opus 4.8's 85.0, and ships a 9B variant small enough to run on a phone.