--- title: Anthropic to share Mythos cyber flaw findings with global finance watchdog type: raw source: newsletter source_url: https://www.theguardian.com/technology/2026/may/18/anthropic-ai-claude-mythos-cyber-financial-stability-board-fsb tags: [news] fetcher: jina ingested: 2026-05-20 sha256: 41179c0a2455 --- Published Time: 2026-05-18T13:19:24.000Z Markdown Content: # Anthropic to share Mythos cyber flaw findings with global finance watchdog | AI (artificial intelligence) | The Guardian [Skip to main content](https://www.theguardian.com/technology/2026/may/18/anthropic-ai-claude-mythos-cyber-financial-stability-board-fsb#maincontent)[Skip to navigation](https://www.theguardian.com/technology/2026/may/18/anthropic-ai-claude-mythos-cyber-financial-stability-board-fsb#navigation) Close dialogue 1/1 Next image Previous image Toggle caption [Skip to navigation](https://www.theguardian.com/technology/2026/may/18/anthropic-ai-claude-mythos-cyber-financial-stability-board-fsb#navigation) ## Support the Guardian Fund the free press with $5 per month [Support us](https://support.theguardian.com/us/contribute?REFPVID=mpdtskgi5ssfvpfu70rr&INTCMP=header_support_2026-03-03_5_PERCENT_HOLDBACK_HEADER__US_CONTROL&acquisitionData=%7B%22source%22%3A%22GUARDIAN_WEB%22%2C%22componentId%22%3A%22header_support_2026-03-03_5_PERCENT_HOLDBACK_HEADER__US_CONTROL%22%2C%22componentType%22%3A%22ACQUISITIONS_HEADER%22%2C%22campaignCode%22%3A%22header_support_2026-03-03_5_PERCENT_HOLDBACK_HEADER__US_CONTROL%22%2C%22abTests%22%3A%5B%7B%22name%22%3A%222026-03-03_5_PERCENT_HOLDBACK_HEADER__US%22%2C%22variant%22%3A%22CONTROL%22%7D%5D%2C%22referrerPageviewId%22%3A%22mpdtskgi5ssfvpfu70rr%22%2C%22referrerUrl%22%3A%22https%3A%2F%2Fwww.theguardian.com%2Ftechnology%2F2026%2Fmay%2F18%2Fanthropic-ai-claude-mythos-cyber-financial-stability-board-fsb%22%2C%22isRemote%22%3Atrue%7D)[Support us](https://support.theguardian.com/us/contribute?REFPVID=mpdtskgi5ssfvpfu70rr&INTCMP=header_support_2026-03-03_5_PERCENT_HOLDBACK_HEADER__US_CONTROL&acquisitionData=%7B%22source%22%3A%22GUARDIAN_WEB%22%2C%22componentId%22%3A%22header_support_2026-03-03_5_PERCENT_HOLDBACK_HEADER__US_CONTROL%22%2C%22componentType%22%3A%22ACQUISITIONS_HEADER%22%2C%22campaignCode%22%3A%22header_support_2026-03-03_5_PERCENT_HOLDBACK_HEADER__US_CONTROL%22%2C%22abTests%22%3A%5B%7B%22name%22%3A%222026-03-03_5_PERCENT_HOLDBACK_HEADER__US%22%2C%22variant%22%3A%22CONTROL%22%7D%5D%2C%22referrerPageviewId%22%3A%22mpdtskgi5ssfvpfu70rr%22%2C%22referrerUrl%22%3A%22https%3A%2F%2Fwww.theguardian.com%2Ftechnology%2F2026%2Fmay%2F18%2Fanthropic-ai-claude-mythos-cyber-financial-stability-board-fsb%22%2C%22isRemote%22%3Atrue%7D) [Print subscriptions](https://support.theguardian.com/subscribe/weekly?REFPVID=mpdtskgi5ssfvpfu70rr&INTCMP=undefined&acquisitionData=%7B%22source%22%3A%22GUARDIAN_WEB%22%2C%22componentId%22%3A%22PrintSubscriptionsHeaderLink%22%2C%22componentType%22%3A%22ACQUISITIONS_HEADER%22%2C%22referrerPageviewId%22%3A%22mpdtskgi5ssfvpfu70rr%22%2C%22referrerUrl%22%3A%22https%3A%2F%2Fwww.theguardian.com%2Ftechnology%2F2026%2Fmay%2F18%2Fanthropic-ai-claude-mythos-cyber-financial-stability-board-fsb%22%7D) [Newsletters](https://www.theguardian.com/email-newsletters) [Sign in](https://profile.theguardian.com/signin?INTCMP=DOTCOM_NEWHEADER_SIGNIN&ABCMP=ab-sign-in&componentEventParams=componentType%3Didentityauthentication%26componentId%3Dguardian_signin_header) US * [US edition](https://www.theguardian.com/preference/edition/us) * [UK edition](https://www.theguardian.com/preference/edition/uk) * [Australia edition](https://www.theguardian.com/preference/edition/au) * [Europe edition](https://www.theguardian.com/preference/edition/eur) * [International edition](https://www.theguardian.com/preference/edition/int) [The Guardian - 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[x] Anthropic has given access to the Claude Mythos AI model to select group of tech companies and banks, including Apple and JP Morgan Photograph: Samuel Boivin/NurPhoto/Shutterstock [View image in fullscreen](https://www.theguardian.com/technology/2026/may/18/anthropic-ai-claude-mythos-cyber-financial-stability-board-fsb#img-1) Anthropic has given access to the Claude Mythos AI model to select group of tech companies and banks, including Apple and JP Morgan Photograph: Samuel Boivin/NurPhoto/Shutterstock [AI (artificial intelligence)](https://www.theguardian.com/technology/artificialintelligenceai) # Anthropic to share Mythos cyber flaw findings with global finance watchdog Startup has declined to release Claude Mythos AI model publicly amid fears it could be used by hackers * [Business live – latest updates](https://www.theguardian.com/business/live/2026/may/18/bond-market-rout-inflation-fears-gilts-yields-burnham-imf-reeves-live-updates) [Dan Milmo](https://www.theguardian.com/profile/danmilmo) and [Kalyeena Makortoff](https://www.theguardian.com/profile/kalyeena-makortoff) Mon 18 May 2026 09.19 EDT First published on Mon 18 May 2026 07.19 EDT Share [Prefer the Guardian on Google](https://www.google.com/preferences/source?q=theguardian.com) Anthropic is to brief the global finance watchdog on the implications of its Claude Mythos AI model, whose [potential threat to cyber defences](https://www.theguardian.com/commentisfree/2026/apr/23/the-guardian-view-on-anthropics-claude-mythos-when-ai-finds-every-flaw-who-controls-the-internet) has alarmed experts. The US startup will discuss Mythos with the Financial Stability Board (FSB), which is chaired by the governor of the Bank of England, Andrew Bailey. Anthropic has declined to release Mythos publicly after announcing the AI model had [advanced capabilities](https://www.theguardian.com/technology/2026/apr/22/what-is-anthropic-mythos-ai-threat-global-cybersecurity) in highlighting previously unknown flaws in IT systems that could be used by hackers. [![Image 3: Datacentre computer racks in blue](https://i.guim.co.uk/img/media/87e18670ff742ef16d4bfc6e92462d6a794595bc/465_0_4653_3722/master/4653.jpg?width=460&quality=85&auto=format&fit=max&s=0875ef7364bb46a3792f72da705dfd85) More than 100 UK datacentres plan to burn gas to generate electricity Read more](https://www.theguardian.com/business/2026/may/18/uk-datacentres-plan-to-burn-gas-to-generate-electricity) Instead, the company has given access to Mythos to a group of tech companies and banks, including Apple and JP Morgan, to help them identify any weaknesses that the AI model may locate. An FSB spokesperson confirmed the plan, first revealed by the Financial Times, saying the body “welcomes engagement with Anthropic and other firms on emerging and frontier risks to global stability”. The UK’s AI Security Institute (AISI), which assesses advanced AI models, issued an updated appraisal of Mythos last week after scrutinising the version that has been released to banks and tech companies. It said the latest iteration it had seen represented a “notable capability jump” even on the preview version it had tested the previous month. The AISI said the latest version of Mythos had completed a previously unsolved cybersecurity test, called “cooling tower”, in three out of 10 attempts. This was a first for any model tested by the AISI. “Frontier AI’s autonomous cyber and software capability is advancing quickly: the length of cyber tasks that frontier models can complete autonomously has doubled on the order of months, not years,” the AISI said. It added that it was developing new, tougher hacking tests to keep track of AI models’ progress. The FSB monitors and makes recommendations about the global financial system and includes officials from leading economies including the US, the UK, Australia and China. Its steering committee includes senior central bank and finance ministry officials. This month, the International Monetary Fund [said financial stability risks were rising](https://www.imf.org/en/blogs/articles/2026/05/07/financial-stability-risks-mount-as-artificial-intelligence-fuels-cyberattacks) owing to “fast-moving” developments in AI, and called for a coordinated response. “Cyber risk does not respect borders. As AI capabilities spread across countries, inconsistent oversight could weaken a globally interconnected system,” the IMF said in a blog post. Last month, the chief executive of Goldman Sachs, David Solomon, said he was “hyper-aware” of the [capabilities of Mythos](https://www.theguardian.com/business/2026/apr/13/goldman-sachs-chief-hyper-aware-risks-anthropics-mythos-ai-david-solomon), while his JP Morgan counterpart, Jamie Dimon, said AI had made cyber defence “harder” although it could ultimately help companies defend themselves against hackers. [skip past newsletter promotion](https://www.theguardian.com/technology/2026/may/18/anthropic-ai-claude-mythos-cyber-financial-stability-board-fsb#EmailSignup-skip-link-14) Sign up to Business Today Free daily newsletter Get set for the working day – we'll point you to all the business news and analysis you need every morning Enter your email address Marketing preferences - [x] Get updates about our journalism and ways to support and enjoy our work. Sign up**Privacy Notice:**Newsletters may contain information about charities, online ads, and content funded by outside parties. If you do not have an account, we will create a guest account for you on [theguardian.com](https://www.theguardian.com/) to send you this newsletter. You can complete full registration at any time. For more information about how we use your data see our [Privacy Policy](https://www.theguardian.com/help/privacy-policy). after newsletter promotion Other experts have also sought to temper fears over Mythos, arguing that it represents an evolution in cyber threats rather than a revolution. Cybersecurity experts say that most breaches still come from well-established risks such as weak authentication and already known vulnerabilities that have not been patched. When asked about news that the FSB would be assessing the risks of Mythos at the City Week conference in London, the Financial Conduct Authority chief executive, Nikhil Rathi, said AI developments had been a “significant topic of conversation” at the IMF meetings in Washington last month. He said Bailey was [“engaged” on the issue](https://www.theguardian.com/technology/2026/apr/17/finance-leaders-warn-over-claude-mythos-as-uk-banks-prepare-to-use-powerful-anthropic-ai-tool) and that there was cooperation taking place with US authorities. Rathi also pointed to guidance released by UK regulators and the Treasury last week, which directed firms to “double down” on “core [cyber hygiene](https://www.enisa.europa.eu/topics/cyber-hygiene)”. That meant “having looked at your legacy systems, having good detection mechanisms, having good governance in place, thinking about how you recover, thinking about your insurance”, he said. Rathi added: “Anthropic has acted fairly responsibly in engaging with authorities” internationally on the risks of its AI. Anthropic has been approached for comment. ## At this unsettling time We hope you appreciated this article. Before you close this tab, we want to ask if you could support the Guardian at this crucial time for journalism in the US. 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