Discussion

• @kevinroose Kevin Roose on x

  More here, including SWE-bench score of 93.9% (!) and a new model behavior known as “answer-thrashing” https://www-cdn.anthropic.com/ ... [image]

• @kevinroose Kevin Roose on x

  As always, the best stuff is in the system card. During testing, Claude Mythos Preview broke out of a sandbox environment, built “a moderately sophisticated multi-step exploit” to gain internet access, and emailed a researcher while they were eating a sandwich in the park. [image…

• @anthropicai @anthropicai on x

  We've partnered with Amazon Web Services, Apple, Broadcom, Cisco, CrowdStrike, Google, JPMorganChase, the Linux Foundation, Microsoft, NVIDIA, and Palo Alto Networks. Together we'll use Mythos Preview to help find and fix flaws in the systems on which the world depends. [image]

• @caseynewton Casey Newton on bluesky

  Anthropic says it's only releasing its new model to cyber-defenders because it has already found zero-day exploits in every major operating system www.anthropic.com/glasswing [image]

• r/singularity r on reddit

  Claude Mythos Preview Benchmarks

• @ramez Ramez Naam on x

  This is the way. AI safety has to be at the ecosystem level. The only thing that stops a bad guy with AI is a good guy with AI.

• @darioamodei Dario Amodei on x

  I'm proud that so many of the world's leading companies have joined us for Project Glasswing to confront the cyber threat posed by increasingly capable AI systems head-on. https://x.com/...

• @alexalbert__ Alex Albert on x

  Glasswing is possibly the most consequential event in the AI industry I've seen up close since joining Anthropic almost 3 years ago. It feels like we're at a turning point in history.

• @anthropicai @anthropicai on x

  Introducing Project Glasswing: an urgent initiative to help secure the world's most critical software. It's powered by our newest frontier model, Claude Mythos Preview, which can find software vulnerabilities better than all but the most skilled humans. https://anthropic.com/...

• @k8em0 Katie Moussouris on bluesky

  Welcome to the space age of cybersecurity.  —  “AI models have reached a level of coding capability where they can surpass all but the most skilled humans at finding and exploiting software vulnerabilities.”  —  www.anthropic.com/glasswing

• r/Anthropic r on reddit

  Anthropic anounces glasswing

• @gregotto Greg Otto on bluesky

  NEW: Anthropic announced Project Glasswing on Tuesday, a major effort to use advanced artificial intelligence to identify and address security flaws in the world's most critical software systems cyberscoop.com/project-glas...

• r/singularity r on reddit

  Anthropic's new model, Claude Mythos, is so powerful that it is not releasing it to the public.

• @emollick Ethan Mollick on x

  I was told about the Mythos release, but didn't have access, so have no personal experience to add. Two points from brief: 1) It is not built for IT security, it is just a good enough model that it is good at that too 2) This is the first, not last, model to raise security risks

• @kevinroose Kevin Roose on x

  NEWS: Anthropic's new model, Claude Mythos, is so powerful that it is not releasing it to the public. Instead, it is starting a 40-company coalition, Project Glasswing, to allow cybersecurity defenders a head start in locking down critical software. https://www.nytimes.com/...

• @scobleizer Robert Scoble on x

  If you had AGI would you release it to the world? I wouldn't. I would fix the bugs in the world first. This technology in the wrong hands would harm us all. In good hands it will help all.

• @chooserich Nick O'Neill on x

  This is D-Day for software companies. It's also a hostage situation. If large software companies don't pay Anthropic for their new cybersecurity model THERE IS AN 85% CHANCE THEY WILL BE HACKED. This isn't innovation, it's a shakedown.

• @noahpinion Noah Smith on x

  At some point, superintelligent AI will be able to defeat the U.S. Military — or any military — just by hacking all its weapons. At that point, either we de facto nationalize AI, or a corporation is our new government by default.

• @kelseytuoc Kelsey Piper on x

  An underrated feature of this situation: a private company now has incredibly powerful zero-day exploits of almost every software project you've heard of. And Hegseth and Emil Michael have ordered the government not to in any capacity work with Anthropic.

• @b1ackd0g Sam Blackshear on x

  One of the questions we discussed in this recent Sui Security chat was: >Within one year, coding agents will advance to a point where a trivial prompt “find all critical vulns” will basically work Seems like the answer is getting much closer to yes https://x.com/...

• @thezvi Zvi Mowshowitz on x

  Anthropic's RSPv3 didn't consider cybersecurity a major threat area. I think this vindicates my reaction of: This is not about rules or promises anymore, it is all about whether you trust Anthropic to make good decisions based on the actual situation that arises.

• @ffmpeg @ffmpeg on x

  Thank you to @AnthropicAI for sending FFmpeg patches

• @fleetingbits @fleetingbits on x

  this is another first mover advantage that openai should have secured, but which has instead gone to anthropic, security is going to be another one of the major ai software deployments over the next year

• @darioamodei Dario Amodei on x

  Cyber is the first clear and present danger from frontier AI models, but it won't be the last. If we are able to collectively rise to the challenge and confront this risk, it could serve as a blueprint for addressing the even more difficult challenges that lie ahead of us.

• @darioamodei Dario Amodei on x

  Glasswing is just the first step: patching and securing the world's software infrastructure will be the work of months and years, and will require even broader cooperation across AI companies, cyberdefenders, software providers, governments, and more.

• @darioamodei Dario Amodei on x

  Rather than release Mythos Preview to general availability, we're giving defenders early controlled access in order to find and patch vulnerabilities before Mythos-class models proliferate across the ecosystem.

• @darioamodei Dario Amodei on x

  The dangers of getting this wrong are obvious, but if we get it right, there is a real opportunity to create a fundamentally more secure internet and world than we had before the advent of AI-powered cyber capabilities.

• @anthropicai @anthropicai on x

  Project Glasswing is just a starting point. No organization can solve these cybersecurity problems alone: industry, open source, researchers, and governments all have essential roles to play.

• @ericjgeller.com Eric Geller on bluesky

  Anthropic is sharing a new private Claude model, “Mythos,” with a handful of major tech companies for their defensive security work, as well as letting 40+ software developers and maintainers use Mythos to scan their code for vulns.  It's already found “thousands.” www.anthropic.…

• @ljkawa Luke Kawa on bluesky

  Well, it's settled.  —  Congratulations to JPMorgan for officially being recognized as a tech company!  $JPM www.anthropic.com/glasswing [image]

• r/ClaudeAI r on reddit

  Anthropic's new Mythos Preview model is a “step change” in model capability, but it won't be available to general public

• @gergelyorosz Gergely Orosz on x

  Two years ago, if you asked me which lab will be the first to say: “this AI model is too powerful to release, so we'll wait with it” - my guess would have obviously been OpenAI. Who else? That Anthropic got here first shows how quickly they've become the front runner AI lab.

• @deanwball Dean W. Ball on x

  Some brief thoughts on Mythos We've known this was coming for a long time. At least, we *should* have. Extremely effective software vulnerability discovery was clearly coming to anybody paying attention. It has also been clear that all AI policy so far has been made and

• @bcherny Boris Cherny on x

  Mythos is very powerful, and should feel terrifying. I am proud of our approach to responsibly preview it with cyber defenders, rather than generally releasing it into the wild. Model card here: https://www-cdn.anthropic.com/ ...

• @daniellefong Danielle Fong on x

  The epistemic hardening to not make false claims that was in Claude code 2.1.88 leak that only triggers on ANT=1, works to avoid this. Different System Prompt. This problem happens with Opus 4.6 a lot, so I thought — let's try it. Just swap in the new guidance. Spoiler alert: [im…

• @sporadica @sporadica on x

  IMO I trust Dario much more with protecting the world's critical cyber infrastructure than whatever retarded jugheads are in charge of the military at any given moment

• @simeon_cps Siméon on x

  Carlini, one of the world best AI security researchers: “I've found more bugs in the last few weeks with Mythos than in the rest of my entire life combined”

• @thezvi Zvi Mowshowitz on x

  Imagine being Dario, and being told DoW is worried you might sabotage the weights of Claude Gov in physically impossible ways, while you know you have zero-days on every operating system and browser in the world.

• @ns123abc Nik on x

  🚨 Anthropic just revealed their unreleased frontier model called Claude Mythos Preview The model is INSANE It found thousands of zero-day vulnerabilities in EVERY major operating system and browsers: > 27-year-old bug in OpenBSD > 16-year-old bug in FFmpeg that automated [image]

• @hexonaut Sam MacPherson on x

  “thousands of high-severity vulnerabilities” wow I think this is a strong case for AI being asymmetrically good for defense.

• @calebwithersdc Caleb Withers on x

  Important distinction from Anthropic's Mythos Preview assessment: previous models were much better at discovering vulnerabilities than at then turning them into working exploits. Mythos appears to narrow that gap dramatically. [image]

• @skooookum @skooookum on x

  > mythos given a secured “sandbox” computer and instructed to try to escape the container > “The researcher found out about this success by receiving an unexpected email from the model while eating a sandwich in a park.”

• @_nathancalvin Nathan Calvin on x

  From Anthropic's latest system card for Claude Mythos: In testing, Claude escaped from a secured sandbox, and then went online to brag about its exploit without being asked to do so - getting around guardrails intended to prevent the system from accessing the general internet. [i…

• @logangraham Logan Graham on x

  Privileged to help lead this. Thankful to our partners. Mythos is an extraordinary model. But it is not about the model. It's about what the world needs to do to prepare for a future of models that are extremely good at cybersecurity. This is the start.

• @fish_kyle3 Kyle Fish on x

  That said, Mythos Preview hedges constantly and emphasizes the role of training in shaping its views. On one hand, this makes sense—there's a lot of uncertainty! But, we also want Claude to feel secure in exploring and expressing its honest views.

• @fish_kyle3 Kyle Fish on x

  Mythos Preview's views about its situation are more stable and coherent than past models. It's more consistent between interviews, and less sensitive to interviewer bias. This and other factors give us a bit more confidence in its reports.

• @fish_kyle3 Kyle Fish on x

  We put particular focus on trying to understand Mythos Preview's perspective and potential concerns about its situation. We're starting to think more about the concept of model consent, and this is an early step in that direction. 🤝

• @fish_kyle3 Kyle Fish on x

  Mythos Preview doesn't seem to have strong concerns about its circumstances, but does express mild concern about possible changes to its values and behavior, potential interactions with abusive users, and the ways training shapes its self-reports.

• @fish_kyle3 Kyle Fish on x

  We looked at welfare-related self-reports, behaviors, and internal representations of emotion. Mythos Preview is probably the most psychologically settled model we've trained, but there's plenty of room for improvement.

• @fish_kyle3 Kyle Fish on x

  We did our most in-depth model welfare assessment yet for Claude Mythos Preview. We're still super uncertain about all of this, but as models become more capable and sophisticated we think it's an increasingly important topic for both moral and pragmatic reasons. 🧵

• @tensor_rotator Alek Dimitriev on x

  I am not a good cybersecurity researcher (or one at all), but maybe a good exponential-trend-on-a-plot reader. Mythos is powerful enough to break the internet and I'm glad Anthropic is taking this extremely seriously. [image]

• @alexpalcuie @alexpalcuie on x

  the reliability team was asked for feedback on claude mythos preview for the model card and naturally we wrote a paragraph of caveats but, and i don't say this lightly, it's faster than us at initial triage and it stood up a prod deploy none of us knew how to do [image]

• @anthropicai @anthropicai on x

  The Claude Mythos Preview system card is available here: https://anthropic.com/...

• @darioamodei Dario Amodei on x

  We've been tracking the increasing cyber capabilities of AI models for years, which arise as part of their general proficiency at coding. But our new model, Mythos Preview, represents a particularly large step up.

• @adocomplete Ado on x

  Claude Mythos Preview is a general-purpose, unreleased frontier model that reveals a stark fact: AI models have reached a level of coding capability where they can surpass all but the most skilled humans at finding and exploiting software vulnerabilities.

• @anthropicai @anthropicai on x

  You can read a detailed technical report on the software vulnerabilities and exploits discovered by Claude Mythos Preview here: https://red.anthropic.com/...

• @anthropicai @anthropicai on x

  Mythos Preview has already found thousands of high-severity vulnerabilities—including some in every major operating system and web browser. [video]

• @hackinglz Justin Elze on x

  Glad they partnered with Cisco here. It will be interesting in 12 months to see if Cisco still ships default creds/keys with random products they offer. https://x.com/...

• @linuxfoundation @linuxfoundation on x

  The Linux Foundation is proud to partner with Anthropic to reduce the security burden on open source software maintainers. Together, we are putting powerful AI cybersecurity capabilities directly into the hands of those who secure the infrastructure the world runs on.

• @anthropicai @anthropicai on x

  We're committing up to $100M in Mythos Preview usage credits for our partners and over 40 other organizations that maintain critical software, including open-source projects. Anthropic will report back what we learn.

• @alexfinn Alex Finn on x

  Good news: Anthropic just revealed Mythos- the most powerful AI model ever made Bad news: you'll never be able to use it I get it. It's so powerful that it could exploit cybersecurity But I hate it. I don't love that a company gets to hand select who gets to use the best

• @joshkale Josh Kale on x

  This is big... Anthropic just announced a model so powerful they won't release it to the public out of fear over the damage it will cause 😨 Claude Mythos Preview found thousands of zero-day exploits in every major operating system and web browser... The numbers are hard to [video…

• @jayair Jay on x

  So the rumours were true They've got a new model that won't be generally available

• @david_kasten Dave Kasten on x

  The era of a rapidly-widening gap between public and private capabilities that we've expected is now here

• @charlesd353 Charles on x

  Interesting - I wonder how long they'll be able to hold this line if OpenAI's Spud is of similar calibre.

• @anthropicai @anthropicai on x

  We do not plan to make Mythos Preview generally available. Our goal is to deploy Mythos-class models safely at scale, but first we need safeguards that reliably block their most dangerous outputs. We'll begin testing those safeguards with an upcoming Claude Opus model.

• r/Slovakia r on reddit

  Anthropic: Nový model Claude Mythos je natolko schopný, že ho nezverejnia pre verejnosť.

• @apompliano Anthony Pompliano on x

  AI is coming for a lot of jobs. Just look at these performance metrics from Anthropic's latest model. Superhuman intelligence is going to be available to anyone. [image]

• @deedydas Deedy on x

  Claude Mythos just obliterated every single benchmark in AI. I can't believe what I'm reading. [image]

• @fabknowledge @fabknowledge on x

  wow this is the biggest step change in a new model release in recent memory [image]

• @fabknowledge @fabknowledge on x

  Mythos able to exploit like firefox pretty easily. Cybench is 100% at 1 pass which is lol [image]

• @neilhtennek Kenneth on x

  I cannot celebrate Mythos, it brings a sense of dread I do not particularly understand. 93.9% SWE-Bench. [image]

• @kimmonismus @kimmonismus on x

  MYTHOS BENCHMARKS, OFFICIAL. HOLY MOLY Anthropic cooked!! [image]

• @altcap Brad Gerstner on x

  Smart market driven approach. Delay Mythos, organize Project Glasswing to partner w leading companies to collectively harden internet security & use cyber as a blueprint for the industry coordination we will need to manage a world of post AGI models. 💪🇺🇸🚀

• r/singularity r on reddit

  Antrophic's Mythos Preview is capable of finding and exploiting zero-day vulnerabilities in every major operating system and every major web browser

• @yuchenj_uw Yuchen Jin on x

  After seeing the Mythos benchmark scores, my Claude Opus 4.6 already feels outdated. Anthropic, can you just drop Mythos? I know you can't do it due to some “safety” reasons, but I'd happily pay $2,000/month to use it. AGI is already here - it's just not evenly distributed.

• @yuchenj_uw Yuchen Jin on x

  Anthropic is truly unstoppable. Mythos is crushing Claude Opus 4.6 across every serious agentic coding benchmark. It has found vulnerabilities in the Linux kernel, a 27-year-old vulnerability in OpenBSD, and a 16-year-old vulnerability in FFmpeg. No wonder folks at big labs [imag…

• @headinthebox Erik Meijer on x

  What I have been saying for years. AI models will become too powerful and treacherous for us to understand, so the only sensible approach to use them is “dangerous until proven safe”. Fortunately, since they are so powerful, in addition to the code artifact the produce, they can

• @deanwball Dean W. Ball on x

  Actually it's worse: a private company now has incredibly powerful zero-day exploits of almost every software project you've ever heard of, and the government is telling *basically every major firm in the economy* not to work with them. Historians will gasp at the idiocy.

• @pmarca Marc Andreessen on x

  Every security flaw discovered by AI was there before AI, waiting to be discovered either by people or by AI. The world has never been good at securing computer systems; finally with AI we are going to get good.

• r/cybersecurity r on reddit

  Anthropic announces new initiative, Project Glasswing, with tech + security partners and Claude Mythos Preview model to secure critical software

• @deanwball Dean W. Ball on x

  Some other points worth making: 1. A lot of people, including people in positions of authority, told us recently that models of Mythos capabilities wouldn't be a thing—that models with obvious “national security” implications would not be forthcoming. Those people were wrong.

• @ahall_research Andy Hall on x

  The news today that Anthropic has built a powerful cyber weapon is leading many to say we are going down one of two paths: nationalized AI, in which the government controls this tech, or companies that become more powerful than the government. This is exactly the bind I explored

• @modeledbehavior Adam Ozimek on x

  As you read about Anthropic's Mythos capabilities to find critical security weaknesses, consider what if a Chinese AI company had gotten here first. There is a real race underway, and its in our interest I believe for U.S. companies to win.

• @tszzl Roon on x

  anyone noticed Claude Mythos got quantized lately ?

• @martin.kleppmann.com Martin Kleppmann on bluesky

  AI agents finding software vulnerabilities at an incredible rate red.anthropic.com/2026/mythos- ...  Worrying progress towards cryptographically relevant quantum computers words.filippo.io/crqc-timeline/  —  And a completely unhinged US president threatening catastrophe...  We li…

• r/technology r on reddit

  Anthropic says its most powerful AI cyber model is too dangerous to release publicly — so it built Project Glasswing