Anthropic published "When AI Builds Itself," documenting that in May 2026 more than 80% of all production code merged at Anthropic was authored by Claude โ up from single digits before February 2025. Claude has expanded from completing 4-minute human tasks (March 2024) to full 12-hour tasks (May 2026). Engineers now merge 8ร more code per quarter than they did in 2024. On open-ended coding problems, success rates hit 76%. Task time-horizons have doubled roughly every four months, with SWE-bench and CORE-Bench both saturating within two years. Three scenarios emerge: capability plateau, sustained human-led AI development with efficiency gains, or full recursive self-improvement where "humans play a substantially diminished role."