Which large banks have built proprietary AI platforms?

Which banks have named a proprietary AI platform, and at what scale?

The 30 highest-scoring of the 99 banks whose page names a flagship AI platform or programme, in AI-score order. The scale column quotes the first disclosed number on the bank's page that mentions the platform by name; "scale not disclosed" means the bank has named the platform but published no figure for it.

Each row quotes the bank's page on this site; the bank link opens the full record with every source. “Not disclosed” means the page records nothing on that point. Banks absent from the table have no evidence on this topic on their page.

What kinds of platform have the banks built?

Every named platform in the ranking grouped by type, read from the bank's own description: employee assistant, model layer / orchestration, customer-facing assistant, ai programme, data and ml platform. The type is a reading of the description, not a disclosure.

How is this ranking computed?

Inclusion: the bank's page names a flagship in-house AI platform, assistant or programme (the "platform" field, with its sources). Order: the AI-index formula applied to all 140 profiles, so banks that disclose more about AI rank higher among those with a platform. Scale: the first number on the bank's page whose label or value contains the platform's name.

"Proprietary" means the bank names and runs it as its own; most platforms call third-party models (OpenAI, Anthropic, Google) behind a bank-built layer, and the description says so where the bank has.

What are the caveats?

A named platform is a disclosure choice. Several banks run large AI programmes under no brand and so are absent here; their work appears on the AI-leaders and adoption pages.

Scale figures are as reported on the date shown (users, prompts, use cases, lines of code); they are not comparable across banks.

How does this differ from the AI index?

The AI index counts a named platform as one of eight components (10% of the score); this page lists only the banks that have one and adds what each platform is and the scale disclosed for it. The AI index and its method are on their own page; the technology leaders and generative AI guides are hand-written cross-bank tables with their own sourcing.