C Coding AgentsPreviewThis index is in active development: we are still adding agents, refining attribution signatures, and verifying data against sources. The date in the header is when key figures were last re-checked. Numbers can move as coverage improves.
In C repos on public GitHub, 19,337 PRs carried an agent mark between 2026-05 window start and end, which is 10.9% of all C PRs. Claude Code does the most of it.
Coverage: tracks Claude Code, Codex, Copilot agent, Cursor, Devin, and Jules. Codex is measured through hosted task metadata, checked against sampled PRs. Gemini CLI and other terminal agents work through the developer's own identity, leaving nothing public we can detect yet, so they cannot be measured here. We are expanding coverage. Methodology
19,337
Agent-marked PRs
Latest month window
10.9%
Of all C PRs
178K total in window
Claude Code
Does the most C
49% of agent-marked PRs
16
Months tracked
Updated monthly
Who Does The C Work
Agent-marked PRs in C repos, latest month. Counts link to the live GitHub search.
C Over Time
Agent-marked C PRs per month by agent, or each agent's share of them.