Artificial intelligence is expected to show big gains in productivity at banks, panelists said at the Reuters Next conference in New York, but it has so far been harder to make money from the technology. Major banks have been applying AI to virtual assistants for clients and introduced tools for employees to use for human resources, risk, compliance and finance as well as trying to develop products within wealth management. Goldman Sachs Chief Executive David Solomon told the Reuters Conference on Tuesday that deploying machine learning and AI could improve productivity in areas including coding.