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Agent Evaluation

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Friday, 4 September 2026

Which tools do Claude Code, Codex, and Cursor choose?

Armature 7 hours ago 43

Armature ran a large experiment comparing Claude Code, Codex, and Cursor as they implemented the same kinds of third-party services in hundreds of sandboxed coding tasks. The study analyzed 16,893 runs and observed that the agents picked the same tool in only 42% of categories. It published aggregated leaderboards and full traces publicly, which should help developers and vendors evaluate how reliably coding agents choose tools.

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AI Coding Agents Claude Code Agent Evaluation Codex

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