OpenAI president Greg Brockman has stated that 80% of OpenAI's code is now written by AI, with the figure being ambiguous. This follows a trend of AI lab leaders citing self-reinforcing productivity numbers, but the underlying evidence remains more contested than the headline figure suggests. Brockman argues that AI capabilities have crossed a productivity threshold and that compute scarcity is now a constraint on what AI labs can deliver. However, there is a significant body of work questioning whether internal AI-coding productivity numbers should be taken at face value. A February 2026 paper from the National Bureau of Economic Research found 80% companies actively using AI reported no measurable impact on productivity, and a 2025 MIT study concluded that 95% of corporate AI pilot programmes generated zero return on investment.