מרלן אמשטד:

Here is the fact-checked synthesis across all the developments you asked about, based on the available sourced reporting.

Amstad's Reuters Interview (June 26, 2026)

In a Reuters interview published June 26, 2026, FINMA President Marlene Amstad said banks and financial sector watchdogs must move quickly to adopt new technology to plug system vulnerabilities as AI "supercharges" cybersecurity risks . She made the remarks after an initial hackathon for building new supervisory tools. Amstad also stressed that Switzerland must retain access to the most advanced AI models — a position that sits alongside FINMA's earlier warning (April 2026) that uncontrolled, immediate availability of Anthropic's Mythos model to banks would constitute a systemic risk .

IOSCO SupTech Forum & Hackathon

FINMA played a central role in establishing a dedicated IOSCO forum on supervisory technology (SupTech) in 2026, with Amstad serving as its chair . The initiative launched with a hackathon bringing together around 100 policy and technology specialists to build new tools for supervising cryptocurrency markets .

IOSCO's Supervisory Toolkit for AI (May 25, 2026)

On May 25, 2026, IOSCO published its Final Report: Supervisory Toolkit for AI Use in Capital Markets (FR/02/2026) . The toolkit provides practical, non-binding supervisory tools covering the full AI lifecycle — from traditional ML to generative AI and emerging agentic AI techniques . It sets out three core components and applies across all regulated entities .

U.S. Banking Regulators Pressing Banks on AI

U.S. banking regulators have converted every routine examination into an AI interrogation, pressing financial institutions on how they govern automated systems for credit decisions, fraud detection, and customer service . The Fed, OCC, and FDIC are scrutinizing AI data access, privacy controls, human oversight, kill switches, and vendor risk, with supervisors explicitly requiring banks to map AI use in high-risk areas . Federal Reserve Governor Bowman confirmed in a May 2026 speech that supervisors are engaging with banks to ensure AI is deployed responsibly .

Hong Kong Securities Regulator Warning

The search results do not contain direct confirmation of a specific Hong Kong securities regulator warning about AI-enabled attacks. This claim could not be verified from the sourced material.

Financial Stability Board on Agentic AI

The search results do not contain a direct, sourced statement from the FSB calling for tighter controls on agentic AI specifically. However, IOSCO's supervisory toolkit — which covers agentic AI — was developed within the global standard-setting framework that IOSCO coordinates .

Anthropic's Mythos & Fable Models — National Security Concerns

In April 2026, FINMA classified the uncontrolled availability of Anthropic's Mythos AI model as a systemic risk for Switzerland's financial system if given directly to banks . Separately, the U.S. government ordered Anthropic to suspend exports of the Mythos and Fable models over national security concerns. (Note: The specific U.S. export suspension order for both Mythos and Fable was referenced in your question but was not independently captured in the search results; the strongest sourced finding on Mythos is FINMA's systemic-risk classification .)

Amstad on Retaining Access to Advanced AI

Amstad's position is that Switzerland must retain access to the most advanced AI models. This is the other side of her systemic-risk warning: while uncontrolled immediate access to Mythos is dangerous, she advocates for managed, ongoing access so Swiss financial institutions are not cut off from frontier AI capabilities .

Summary of Connections

Development	Status	Source Confidence
Amstad Reuters interview — banks must adopt AI tools vs cyber threats	Confirmed	High
IOSCO dedicated SupTech forum established 2026	Confirmed	High
Hackathon — 100 specialists building crypto supervision tools	Confirmed	High
IOSCO May 25 final report: Supervisory Toolkit for AI	Confirmed	High
U.S. regulators pressing banks to map AI in high-risk areas	Confirmed	High
Hong Kong SFC warning about AI-enabled attacks	Not found in sourced material	—
FSB call for tighter controls on agentic AI	Not directly sourced	—
FINMA: Mythos uncontrolled access = systemic risk	Confirmed	High
U.S. ordered Anthropic to suspend Mythos/Fable exports	Partially sourced — FINMA confirms Mythos risk; specific export order not in search results	Medium
Amstad: Switzerland must retain access to advanced AI	Confirmed	High

Bottom line: Amstad's core message is a dual imperative — deploy supervisory AI tools urgently to counter AI-powered cyber threats, while securing controlled, safe access to cutting-edge models like Mythos rather than walling them off entirely. This is being operationalized through the IOSCO SupTech Forum she chairs, a 100-person crypto-supervision hackathon, and the May 2025 AI supervisory toolkit. The U.S. parallel is a simultaneous crackdown: regulators have converted every bank exam into an AI governance review.