Anthropic’s engineers are merging roughly eight times as much code per quarter as they did in 2024. The kicker: over 80% of that code was written not by the humans, but by Claude.
The figures, disclosed publicly in June 2026, paint a picture of a company that has effectively turned its own product into its most prolific developer. Before the launch of Claude Code in February 2025, AI-generated code contributions at Anthropic sat in the low single digits. Eighteen months later, Claude is writing four out of every five lines that make it into production.
The numbers, and why Anthropic doesn’t fully trust them
Anthropic itself described the 8x productivity claim as “almost certainly overstated,” labeling lines-of-code as a vanity metric.
Internal metrics showed that Claude’s success rate on open-ended coding tasks climbed from approximately 26% to 76%.
