TL;DR
Moody’s has warned that the rush into AI is leaving large banks dependent on a handful of Silicon Valley suppliers, exposed both to sweeping outages and to future price rises. The agency still expects the technology to cut costs and lift income across the City and on Wall Street, but says much of that benefit will be competed away while the dependency stays put.
Systemic dependency, named
The structural claim is the important one. Because so many financial firms lean on the same narrow group of foundation model and cloud suppliers, the agency argues, a systemic dependency is forming: an outage at any one of them could propagate rapidly between customers and across sectors. Moody’s expects supervisors to sharpen their attention on operational resilience and on how concentrated the AI stack has become.
It also flags vendor dependence — the prospect that dominant model and infrastructure suppliers come to set what AI services cost. That is not abstract. Pressure will build as loss-making generative AI companies, OpenAI and Anthropic among them, are pushed to return something to investors.
Banks are not powerless. Moody’s notes they keep control of key assets, proprietary data above all, and that large institutions have decades of practice grinding technology contracts down. Open-source models and selective partnerships are named as offsets.
The UK picture
A Treasury select committee report in January put AI use among City firms above three quarters, with insurers and international banks leading — mostly automating administration, processing claims and assessing creditworthiness.
Lloyds Banking Group is the clearest domestic commitment at scale. Chief executive Charlie Nunn has doubled down with a £13bn strategy including £2bn of cost cuts, acknowledging the effect on staff and saying it will mean continued reskilling alongside new hiring. Moody’s attached a number to the wider displacement question: a one-in-five chance that AI can handle the work of a capable mid-level employee by 2030.
Looking forward
One risk is peculiar to banking. Moody’s suggests AI could make switching to better-paying accounts easier, raising the prospect of deposits moving at short notice — which puts depositor trust and funding stability squarely in scope. The warning arrives the same week HM Treasury proposed an assurance framework for third-party AI and scrutiny of critical suppliers, suggesting regulator and rating agency have reached the same diagnosis.