Anthropic just disclosed that Claude now writes more than 80% of the production code it merges.

Rohan Paul Twitter · Rohan Paul (@rohanpaul_ai) · 2026-06-05

Anthropic has disclosed that Claude now writes more than 80% of the production code it merges internally, up from low single digits before Claude Code launched in February 2025, with per-engineer output reaching 8x the 2024 baseline.

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AI Labs Simultaneously Acknowledge Recursive Self-Improvement Threshold

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Topics: ai-codingsoftware-engineering-productivityclaude-codeagentic-ai

Claims

Claude now writes more than 80% of the production code that Anthropic merges.
Before Claude Code reached research preview in February 2025, Claude's share of merged code was in the low single digits.
Per-engineer output at Anthropic has risen to 8x the 2024 baseline since Claude Code launched.
The shift represents a fundamental change in how Anthropic engineers produce software.

Key quotes

Anthropic just disclosed that Claude now writes more than 80% of the production code it merges.

Before Claude Code reached research preview in 02-25, Claude wrote only low-single-digit merged code, while output per engineer has since risen to 8x the 2024 baseline.