Claude Code vs Codex, decided on YOUR repo in one afternoon — the 3-task test, the printable 5-metric scorecard, the cross-review prompt, and the switch-or-stay matrix from the video

The companion to the video. Everyone is arguing about which AI coding agent is better; this kit replaces the arguing with a test you run yourself. INSIDE (7 pages): THE COMPLETION-FIRST IDEA — why developers are really switching, the four forces, and the 'context tax' diagram that benchmark charts never show · THE SWITCH TEST — 3 real tasks from your own repository (a known-root-cause bug, a feature with written acceptance criteria, a messy architectural problem), with the identical-starting-conditions rules that keep the test honest · THE PRINTABLE SCORECARD — 5 metrics x 2 agents x 3 tasks (compiles, tests pass, architecture preserved, fully complete, would-you-approve-the-diff) plus the intervention penalty and how to read the result · THE CROSS-REVIEW PROMPT — the verbatim copy-paste prompt that makes each agent audit the other's diff, and why disagreement between two capable models finds bugs either one would miss alone · THE SWITCH-OR-STAY MATRIX — 8 workload rows with honest leans, the day-one equivalents table (CLAUDE.md vs AGENTS.md and friends), and the 10-minute instructions-file migration tip · THE RECEIPTS — every Reddit post from the video with points and dates, opened and read Aug 25, 2026. Independent kit from Hyperautomation Labs.

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