datarazimediaAnthropic, May 2026: over 80% of the code merged into its own production codebase was written by its AI. Engineers ship about 8x more code per quarter than across 2021–2025.
One engineer pointed the model at a class of API errors — it shipped 800+ fixes and dropped the error rate 1000x. The same line of models migrated a 50-million-line Ruby codebase in a day.
AI code is only just reaching parity with average human output. Every merge is still human-reviewed.