One authoritative engine, two seat-locked MCP servers, three best-of-threes, and a 3-millisecond whodunit The matches are real: Codex CLI ( gpt-5. 6-sol ) against Claude Code (Claude Opus 5), both playing through the same rules engine. Every number below was recomputed from the raw run.
Source: [Dev.to](https://dev.to/haoxiang_li_a709204042e6b/codex-vs-claude-code-at-liars-dice-the-winning-bluff-was-the-truth-203l)