Japan's megabanks to access Anthropic Mythos AI as cybersecurity concerns mount globally

Japan megabanks to gain access to Anthropic's Mythos in about two weeks, source says

TOKYO, May 13 (Reuters) - Japan's three largest banks are expected to gain access to Mythos, the artificial intelligence model developed by Anthropic, in about two weeks, a person with direct knowledge of the matter said. Mythos is viewed by cybersecurity experts as posing significant challenges to the ⁠banking industry and its legacy technology systems, prompting a series of warnings from regulators and policymakers. A string of U.S. banks have so far been given access to Mythos and Anthropic aims to expand access to European and UK banks, among other organisations, Reuters reported last month. Mitsubishi UFJ Financial ⁠Group (8306.T), opens new tab, Mizuho Financial Group (8411.T), opens new tab and Sumitomo Mitsui Financial Group (8316.T), opens new tab declined to comment. Anthropic did not respond to a request for comment. On Tuesday, Japanese Finance Minister ⁠Satsuki Katayama met U.S. Treasury Secretary Scott Bessent and later said Japan would establish a public-private working group ⁠this week to address cybersecurity risks to the Japanese financial system posed by Mythos. The group's ⁠first meeting will be held on Thursday. Reporting by Takaya Yamaguchi; Additional reporting by Miho Uranaka; Writing by Sam Nussey; Editing by Muralikumar Anantharaman Our Standards: The Thomson Reuters Trust Principles., opens new tab

Mythos goes to Tokyo: Japanese banks to get Anthropic's vulnerability-hunting AI

MUFG, Mizuho, and SMFG would be the first Japanese institutions added to Anthropic's restricted Project Glasswing rollout, a source familiar with the matter told Reuters Japan's three megabanks are set to gain access to Claude Mythos, Anthropic's vulnerability-hunting AI model, within roughly two weeks, a source familiar with the matter told Reuters on Tuesday. It would be the first time a Japanese company has been granted entry to the restricted preview, which has so far been confined to Anthropic's American and a handful of European partners. Mitsubishi UFJ Financial Group, Mizuho Financial Group, and Sumitomo Mitsui Financial Group were informed of the move during meetings in Tokyo this week with US Treasury Secretary Scott Bessent. The three lenders are expected to be onboarded by the end of May. Mythos has been treated by regulators and chief executives as a category-shifting event since Anthropic disclosed its existence earlier this month. The model has discovered thousands of previously unknown zero-day vulnerabilities across every major operating system and every major web browser, and in internal testing it wrote working exploits, including chains that escape both renderer and operating-system sandboxes in a browser. Mozilla last week shipped Firefox 150 with fixes for 271 vulnerabilities found by Mythos in a single evaluation pass. Anthropic has not released the model publicly. Instead, it has run a controlled rollout under what it calls Project Glasswing, with 12 named launch partners, including AWS, Apple, Cisco, Google, JPMorganChase, Microsoft, Nvidia, and Palo Alto Networks, and around 40 further institutions granted access on a case-by-case basis. Japan's inclusion comes weeks after the Fed and US Treasury convened American bank chief executives on the same cyber-risk briefing, and after UK regulators committed to briefing major British banks within days. Tokyo is moving in parallel. Finance Minister Satsuki Katayama announced the formation of a 36-entity public-private working group on Mythos-class risks, comprising the country's major banks, the Bank of Japan, and the Japanese units of Anthropic and OpenAI. The group is chaired by Mizuho's chief information security officer and is charged with identifying exposures, implementing defensive measures, and drafting contingency plans for what would amount to a co-ordinated patching push across the Japanese financial system. For the three banks involved, the immediate question is operational. Mythos under Glasswing terms is delivered with restrictions on output disclosure, with the model used to find vulnerabilities in a partner's own systems and to draft remediation, not to publish exploits. The Mozilla case offers a template: 271 vulnerabilities patched in a single Firefox release after a Mythos sweep, with the model's findings handed back to Mozilla engineers under non-disclosure rather than published. The geopolitical layer is unusually visible. Bessent's role in conveying the access decision in Tokyo aligns Mythos rollout with US Treasury statecraft rather than with Anthropic's commercial channel, an arrangement that has drawn complaints from European capitals. Eurozone finance ministers raised the issue at an Ecofin meeting last week, where no EU government had access to the model while the White House was reported to be blocking further expansion of the partner list. Industry views on Mythos remain split. Some cybersecurity researchers have argued that the vulnerabilities Mythos surfaced are reachable through clever orchestration of public models, and that the bigger story is the rate of improvement of frontier AI in offensive cyber, not Mythos itself. Others, including Anthropic chief executive Dario Amodei, have described the moment as a "cyber moment of danger" that justifies the access controls. Anthropic and the three Japanese banks did not immediately respond to requests for comment, according to the Reuters source's account.

Japan's top banks to get access to Anthropic AI model Mythos, Nikkei reports By Investing.com

Investing.com-- Japan's three largest banks are set to gain access to Claude Mythos, the advanced artificial intelligence model developed by U.S. startup Anthropic, as early as the end of May, the Nikkei reported on Wednesday. According to the report, MUFG Bank (TYO:8306), Sumitomo Mitsui Banking Corp (TYO:8316), and Mizuho Bank (TYO:8411) were likely informed of the move by U.S. Treasury Secretary Scott Bessent during meetings in Japan on Tuesday. Get real-time updates on market-moving news with InvestingPro The Nikkei said the move would mark the first time Japanese organizations have been granted access to Mythos, a high-powered AI model capable of identifying and exploiting software security vulnerabilities far faster than previous systems. Access to the model had reportedly been restricted to roughly 50 organizations globally, including U.S. companies, American banks, and British government agencies. The report said Tokyo had been pressing Washington for access as Japan steps up cybersecurity efforts amid growing concerns over risks posed by cutting-edge AI systems. Japanese Prime Minister Sanae Takaichi had instructed cabinet ministers to strengthen efforts to identify vulnerabilities in the country's infrastructure and reduce AI-related security risks, Nikkei added. The report said access to Mythos was likely discussed during Takaichi's meeting with Bessent on Tuesday.

Japan's megabanks set to access Anthropic's Mythos as soon as this month, Nikkei says

TOKYO, May 13 (Reuters) - Japan's three largest banks are set to acquire access to Mythos, the artificial intelligence model developed by Anthropic, as soon as the end of May, the Nikkei business daily reported on Wednesday. The banking arms of Mitsubishi UFJ Financial Group, Sumitomo Mitsui Financial Group, and Mizuho Financial Group were likely to have been informed of the move by U.S. Treasury Secretary Scott Bessent at a meeting in Japan on Tuesday, the Nikkei said. o This would mark the first time a Japanese company has been granted access to Mythos, the Nikkei said. o Mythos is designed for defensive cybersecurity tasks but its capabilities have sparked fears about the threat to traditional software security as Anthropic said a preview had uncovered many major vulnerabilities affecting every major operating system and web browser. o On Tuesday, Japanese Finance Minister Satsuki Katayama met Bessent and later said Japan would establish a public-private working group this week to address cybersecurity risks to the Japanese financial system posed by Mythos. o The group's first meeting is expected to be held on Thursday. (Reporting by Anton Bridge; Editing by Thomas Derpinghaus)