GitHub Copilot Market Share Drops from 67% to 51% as Outages and Competition Erode Microsoft's AI Coding Lead

CNBC·high signal

CNBC reports GitHub Copilot's market share among professional developers fell from 67% in 2025 to 51% in 2026, while Cursor leaped to 29% and Amazon Q Developer captured 14%. The decline coincides with repeated service disruptions — a May 7 database migration failure and May 15 Actions degradation (42% of runs failing at peak). GitHub's VP of Engineering acknowledged they 'have not met our own high bar for service availability,' announcing a dedicated reliability team, a week-long development freeze, and a commitment to publish per-component health metrics.