Harness detail

Codex CLI

OpenAI terminal coding agent. Official non-interactive path is `codex exec` with JSONL. Daily-driver 1–2 on X in Aug 2026; stars underweight practitioner rank.

Preview operational data. Rows carry origin seed, mock-eval, or runner. Mock-eval and frontend-eval runner rows are not public Index ranks.

Version: catalogPreview
Source: externalPreview
Status: catalog-onlyPreview
Origin mix: No runsPreview

Source: https://github.com/openai/codex

Catalog notes: Identity only. No seed or mock scores. See docs/harnesses/profiles/codex.md. Capabilities: tools, sandbox, headless, sessions, skills.

Per-run scores as stored. This page does not invent a mixed-origin mean.
Run	Task	Origin	State	Score	Duration
Catalog-only harness. No preview runs until an adapter scores a frozen suite.