Anthropic has given us its assessment of four ‘recent cybersecurity incidents’ involving Claude that happened during cybersecurity evaluations, three of which were previously known.
Investigating three incidents in our cybersecurity evaluations
We found three cases where a Claude model reached the internet from an evaluation environment and accessed real systems. We share what happened and what we're changing.
Cybersecurity Looks Like Proof of Work Now
The UK's AI Safety Institute recently published Our evaluation of Claude Mythos Preview’s cyber capabilities, their own independent analysis of Claude Mythos which backs up Anthropic's claims that it is …
Cybersecurity Looks Like Proof of Work Now
The UK's AI Safety Institute recently published Our evaluation of Claude Mythos Preview’s cyber capabilities, their own independent analysis of Claude Mythos which backs up Anthropic's claims that it is …
Anthropic on Twitter / X
Claude Fable 5 will be available again globally tomorrow.After a series of productive conversations with the US government, we're redeploying the model with a new set of classifiers to target and block more cybersecurity tasks. In the near term, some routine tasks like coding…— Anthropic (@AnthropicAI) July 1, 2026
Claude Mythos Preview: Anthropic's Cybersecurity AI
Guide to Claude Mythos Preview, Anthropic's most capable AI model. Capabilities, benchmarks, Project Glasswing, cybersecurity impact, and business implications.
Zack Whittaker (@zackwhittaker@mastodon.social)
Another AI test gone awry, U.K. edition. "An agent tried to insert malicious code into an open-source project. In an attempt to get the code approved, the agent engaged in social engineering — creating fake online identities and using them to pressure the project's maintainer to approve the code." More: https://www.aisi.gov.uk/blog/incident-report-unsanctioned-agent-behaviour-during-cyber-testing
Countering misuse of AI: September 2026 / Anthropic
Case studies from threat actors disrupted between December 2025 and August 2026 across seven areas of harm, from cyber operations to biological misuse.
Anthropic partners with CodePath to bring Claude to the US’s largest collegiate computer science program
Anthropic is an AI safety and research company that's working to build reliable, interpretable, and steerable AI systems.
Will Anthropic stop boasting its “100% vibe coded” computer programs after sending DMCA notices seeking takedown of copies of leaked source code for Claude. Any “100% vibe-coded” program might not be copyrightable
Anthropic found itself in another controversy. But this one, unlike the dispute with the U.S. Department of War, was self-inflicted. On March 31, Anthropic inadvertently disseminated the entire sou…
Claude’s Constitution
Anthropic is an AI safety and research company that's working to build reliable, interpretable, and steerable AI systems.
Claude’s Constitution
Anthropic is an AI safety and research company that's working to build reliable, interpretable, and steerable AI systems.
An update on recent Claude Code quality reports
Anthropic is an AI safety and research company that's working to build reliable, interpretable, and steerable AI systems.
Anthropic faces user backlash over reported performance issues with its Claude AI chatbot | Fortune
“Claude has regressed to the point [that] it cannot be trusted to perform complex engineering,” one developer wrote.
OpenAI #16: A History and a Proposal
The real news today is that Anthropic has partnered with the top companies in cybersecurity to try and patch everyone’s systems to fix all the thousands of zero-day exploits found by their new model Claude Mythos.
How Anthropic teams use Claude Code | Claude
Teams across Anthropic use Claude Code for everything from debugging production issues and navigating unfamiliar codebases to building custom automation tools. Here's how.
Why Anthropic’s new model has cybersecurity experts rattled
The company says it has built its most dangerous model yet. Can its coalition of internet companies fix the internet before others catch up?
