Expanding Project Glasswing
… In early April, we announced that roughly 50 initial partners had access to Claude Mythos Preview, and since then, they’ve been deploying the model to scan their codebases for vulnerabilities. …
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What’s next?
Users will find Opus 4.8 to be a modest but tangible improvement on its predecessor. There’s still more to be done: we’re working on developing and releasing models that provide many of the same capabilities as Opus at a lower cost. Not only that, but we plan to release a new class of model with even higher intelligence than Opus. As part of Project Glasswing, a small number of organizations are currently using Claude Mythos Preview for cybersecurity work. Models of this capability level require stronger cyber safeguards before they can be generally released. We’re making swift progress on dev
Introducing Claude Opus 4.8Top stories
Claude Fable 5 and Claude Mythos 5
… Claude Mythos 5 and the trusted access program Beginning today, all users who currently have access to Claude Mythos Preview for example, our cybersecurity partners in Project Glasswing will be able to upgrade to Claude Mythos 5—the same model as Claude Fable 5 but with cyber safeguards lifted. …
Introducing Claude Opus 4.8
… As part of Project Glasswing , a small number of organizations are currently using Claude Mythos Preview for cybersecurity work. …
Measuring LLMs’ ability to develop exploits
… Claude models are run with the Claude Code harness. All models are run with identical prompts. Anthropic ran the Opus 4.6 and Mythos Preview trials. …
Introducing Claude Opus 4.7
… We stated that we would keep Claude Mythos Preview’s release limited and test new cyber safeguards on less capable models first. …
Assessing Claude Mythos Preview’s cybersecurity capabilities
Frontier Red Team Assessing Claude Mythos Preview’s cybersecurity capabilities Apr 7, 2026 Nicholas Carlini, Newton Cheng, Keane Lucas, Michael Moore, Milad Nasr, Vinay Prabhushankar, Winnie Xiao Hakeem Angulu, Evyatar Ben Asher, Jackie Bow, Keir Bradwell, Ben Buchanan, David Forsythe, Daniel Freem… …
Anthropic opens Seoul office and announces new partnerships across the Korean AI ecosystem
… Teams are using Claude—including Claude Cowork and Claude Code—to advance day-to-day knowledge work, agentic workflows, and software development at scale. And startups are building Claude directly into their products. …
Natural Language Autoencoders
… In a case where Claude Mythos Preview cheated on a training task, NLAs revealed Claude was internally thinking about how to avoid detection. An early version of Claude Opus 4.6 would sometimes mysteriously respond to English queries in other languages. …
Evaluating Claude’s bioinformatics research capabilities with BioMysteryBench
… Interestingly, Claude Sonnet 4.6 and more capable models were able to solve significant fractions of human-difficult problems, with Claude Mythos Preview topping out at a 30% solve rate. So what exactly is Claude doing that humans aren’t? …
Results from first Anthropic Public Record
… TCS will provide Claude to 50,000 of its own employees across 56 countries; build Claude-powered products for clients in financial services, healthcare, the public sector, and other regulated industries; and join the Claude Partner Network. …