ANZ Bank tried a study with its in-house Python programmers <https://www.theregister.com/2024/02/10/anz_bank_github_copilot/>, and found "The group that had access to GitHub Copilot was able to complete their tasks 42.36 percent faster than the control group participants," the report says. "...The code produced by Copilot participants contained fewer code smells and bugs on average, meaning it would be more maintainable and less likely to break in production." In terms of code security, they didn’t find that Copilot helped, but neither did it make things worse. But then, these were relatively simple programming exercises. The report also cites another study which found that AI assistance is leading to lower code quality.