The emergence of Anthropic’s Mythos is prompting a scramble among major banks to access and test the technology, while regulators rapidly assess the cybersecurity risks it poses. At last week’s International Monetary Fund spring meeting in Washington, concerns were raised about how prepared financial institutions are to manage the challenges presented by this new AI model. Several US banks have already begun utilizing Mythos, placing pressure on the rest of the industry to catch up.
“It’s certainly not something that’s causing panic or setting off any alarm bells on our end right now, but it’s definitely something we need to keep in mind in our day-to-day risk management — and that’s exactly what we’re doing,” said Christian Sewing, CEO of Deutsche Bank. He noted that banks are in close communication with European regulators regarding Mythos. Sewing emphasized that banks have their own contingency plans in place, and while everyone is eager to gain access, he believes it is appropriate for access to be limited for now.
Anthropic has restricted access to Mythos primarily to partners in its Project Glasswing initiative, along with around 40 additional organizations that are involved in managing critical software infrastructure. JPMorgan is the only bank publicly acknowledged by Anthropic to have access, though Bank of America has been part of the initiative from the beginning and is testing Mythos technology internally, according to a source familiar with the matter.
Recently, other US banks have reported gaining access to Mythos. Morgan Stanley CEO Ted Pick confirmed during the bank’s earnings call that the bank is involved with the Claude Mythos Preview, stating that discussions about cyber risks are ongoing within the Financial Services Forum. He acknowledged the increasing threat posed by cyber risk and expressed optimism that collaboration will lead to better security measures. Goldman Sachs CEO David Solomon also noted during his earnings call that the bank has access to Mythos, asserting the institution’s commitment to working closely with Anthropic to leverage its capabilities.
Additionally, Citigroup has been reported to have access to Mythos for internal testing, according to an informed source. Some banks that have not gained access are questioning the equity of the current access model, particularly whether JPMorgan has an unfair advantage. This discussion is expected to be brought up with the US Treasury; both the Treasury and Anthropic did not respond to requests for comment.
Multiple senior banking and regulatory sources in Europe have indicated that they are unaware of any European financial institutions currently having access to Mythos. The British government sent an open letter to Anthropic leaders on April 15, citing that testing by its AI Security Institute demonstrated Mythos’s capabilities in cyber offense to be “substantially more capable” than any models previously assessed.
During the IMF meetings, Mythos was a recurring topic. European supervisors are currently evaluating the model through existing cyber resilience frameworks and have not yet expressed alarm. However, the high-level coding capabilities of Mythos are believed to afford it an unprecedented ability to identify cybersecurity vulnerabilities, drawing heightened scrutiny from global regulators.
CS Venkatakrishnan, CEO of Barclays, stated that Mythos represents a serious threat to the global banking system and predicted that it would likely give rise to similar, even more powerful cyber threats. As the banking industry continues to respond to the challenges posed by Mythos, its implications for cybersecurity and risk management are expected to reverberate across the sector. — Tom Sims, Saeed Azhar, Tatiana Bautzer, and Jesus Aguado, with Francesco Canepa, Balazs Koranyi, and Lawrence White in London, (c) 2026 Reuters
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