NEWSAR
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SRCThe Guardian - World News
LANGEN
LEANCenter-Left
WORDS449
ENT12
MON · 2026-05-18 · 11:19 GMTBRIEF NSR-2026-0518-77194
News/Anthropic to share Mythos cyber flaw findings with global fi…
NSR-2026-0518-77194News Report·EN·Technology

Anthropic to share Mythos cyber flaw findings with global finance watchdog

AI startup Anthropic will brief the Financial Stability Board (FSB), a global finance watchdog chaired by the Bank of England governor, on its Claude Mythos AI model. Anthropic has not released Mythos publicly due to concerns it could be exploited by hackers to find IT system flaws.

Dan Milmo Global technology editorThe Guardian - World NewsFiled 2026-05-18 · 11:19 GMTLean · Center-LeftRead · 2 min
Anthropic to share Mythos cyber flaw findings with global finance watchdog
The Guardian - World NewsFIG 01
Reading time
2min
Word count
449words
Sources cited
6cited
Entities identified
12entities
Quality score
100%
§ 01

Briefing Summary

AI-generated
NEWSAR · AI

AI startup Anthropic will brief the Financial Stability Board (FSB), a global finance watchdog chaired by the Bank of England governor, on its Claude Mythos AI model. Anthropic has not released Mythos publicly due to concerns it could be exploited by hackers to find IT system flaws. Instead, the company has provided access to select tech companies and banks, including Apple and JP Morgan, to identify potential weaknesses. The UK's AI Security Institute has assessed Mythos, noting a significant capability jump and its success in a challenging cybersecurity test. The FSB monitors global financial stability, and the International Monetary Fund has warned of rising financial stability risks from rapid AI developments, emphasizing the need for a coordinated response to cross-border cyber risks.

Confidence 0.90Sources 6Claims 5Entities 12
§ 02

Article analysis

Model · rule-based
Framing
Technology
Economic Impact
Tone
Mixed Tone
AI-assessed
CalmNeutralAlarmist
Factuality
0.70 / 1.00
Factual
LowHigh
Sources cited
6
Well sourced
FewMany
§ 03

Key claims

5 extracted
01

The International Monetary Fund warned that financial stability risks are rising due to fast-moving AI developments.

factualInternational Monetary Fund (IMF)
Confidence
1.00
02

Mythos successfully completed a previously unsolved cybersecurity test, 'cooling tower', in three out of 10 attempts.

statisticUK's AI Security Institute (AISI)
Confidence
1.00
03

The UK's AI Security Institute (AISI) stated the latest version of Mythos represents a 'notable capability jump'.

quoteUK's AI Security Institute (AISI)
Confidence
1.00
04

Anthropic will brief the Financial Stability Board on its Claude Mythos AI model's implications for cyber defenses.

factualAnthropic, Financial Stability Board
Confidence
1.00
05

Cybersecurity experts caution that most breaches still stem from well-established risks like weak authentication.

factualCybersecurity experts
Confidence
0.80
§ 04

Full report

2 min read · 449 words
Anthropic is to brief the global finance watchdog on the implications of its Mythos" class="entity-link entity-organization" data-entity-id="71036" data-entity-type="organization">Claude Mythos AI model, whose potential threat to cyber defences has alarmed experts.The US startup will discuss Mythos with the Financial Stability Board, which is chaired by the governor of the Bank of England, Andrew Bailey.Anthropic has declined to release Mythos publicly, after announcing that it had advanced capabilities in highlighting previously unknown flaws in IT systems – which could be utilised by hackers.Instead, the company has given access to the model to a group of tech companies and banks, including Apple and JP Morgan, to help them identify any weaknesses that Mythos might locate. The FSB plan, which was first reported by the Financial Times, was confirmed by a source familiar with the discussions between the regulator and Anthropic.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.AISI said the latest version of Mythos had completed a previously unsolved cybersecurity test, dubbed “cooling tower”, in three out of 10 attempts. This was a first for any model tested by 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,” AISI said.AISI 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 warned that financial stability risks were rising due 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.The chief executive of Goldman Sachs, David Solomon, said last month he was “hyper-aware” of the capabilities of Mythos. JP Morgan’s CEO, Jamie Dimon, added last month that AI had made cyber defence “harder” although it could ultimately help companies defend themselves against hackers.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 caution that most breaches still come from well-established risks such as weak authentication and already known vulnerabilities that have not been patched.The FSB and Anthropic have been approached for comment.
§ 05

Entities

12 identified
§ 06

Keywords & salience

10 terms
mythos ai model
1.00
ai cyber flaw
1.00
financial stability board
0.90
cybersecurity
0.80
ai security
0.70
frontier ai
0.60
financial stability
0.50
ai capabilities
0.50
anthropic
0.40
ai models
0.40
§ 07

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