AI is core to JPMorgan’s $18 billion tech investment. Here’s what its execs revealed about how it’s reshaping the bank.

When JPMorgan CFO Jeremy Barnum recently took some time to experiment with “vibe coding,” he was amazed.

Computer scientists at the firm told him that using plain-language prompts to generate code with AI — known as vibe coding — has improved their efficiency, too. Barnum told investors and analysts at JPMorgan’s 2025 Investor Day on Monday. “We have high hopes for the efficiency gains we might get,” he added.

Barnum’s remarks on how artificial intelligence is…