GitHub analysis: Copilot agent leads AI-signed PRs in 40 of 388 repos, while Claude Code leads in 279 due to default trailers

·2026.11.09 23:09

Key point

A 12-month analysis of 383 popular GitHub repos reveals that Copilot's coding agent is the top signer in 40 repos, while Claude Code leads in 279 primarily because it adds a co-author trailer by default.

Details

Copilot's coding agent is the top signer in 40 of the 388 repos with AI-signed PRs, while Copilot CLI leads in 22 repos.
Claude Code leads in 279 repos, but this is largely because it adds a co-author trailer unless disabled, meaning the data ranks what is recorded rather than actual usage.
Microsoft's own code shows the highest adoption, with 8 C# repos averaging 41% AI-signed PRs from July to September, almost all from Copilot, compared to 11% for the other 42 C# repos.
In VS Code, 71% of merged PRs since August carry an AI signal, nearly all of which are Copilot CLI trailers.
The analysis covers 12 months of merged PRs in 383 popular GitHub repos, with a full CSV and method available on coderot.ai.

open-source claude-code ai-coding github copilot developer-tools

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