Bank of America hired 1,000 contractors in the second quarter to help patch vulnerabilities exposed by Anthropic’s Mythos, CEO Brian Moynihan said. The contractors remain alongside 3,000 employees working on software remediation across the bank’s proprietary code and vendor-supplied systems. Moynihan said the bank spent a couple hundred million dollars plus in the third quarter on remediation and regulatory matters tied to anti-money-laundering compliance, costs he expects to decline as the patching pipeline moves through. Bank of America shares fell as much as 8% on Wednesday. Anthropic made Mythos available in April to a select group of banks, technology companies and government bodies, prompting U.S. banks to accelerate fixes for vulnerabilities the model identified. The compliance costs followed a $1.2 billion penalty announced Tuesday by the Treasury Department’s Financial Crimes Enforcement Network over the bank’s failure to report suspicious transactions.