The announcement is dated September 14, 2026.
Fujitsu reports that, from basic design through integration testing, the initiative achieved:
- 30% reduction in development period
- 40% reduction in man-hours
- up to 90% reduction in impact-assessment effort
- up to 40% reduction in design-document creation effort
- 99% source-code generation rate
- up to 90% reduction in integration-test execution effort
The AI is being incorporated into the actual core-banking system development process, with AI agents using design documents, source code and test assets across stages, while humans retain judgment, approval and quality assurance.
Fujitsu explicitly says the model is intended to be extended to other financial institutions and other systems.
Source: Fujitsu — Sony Bank and Fujitsu apply Generative AI to Core Banking System Development