gstack-codex

/codex

/codex — the Second Opinion. An independent review from the OpenAI Codex CLI — a completely different AI looking at the same diff. Three modes: review (pass/fail gate), adversarial challenge (actively tries to break your code), and open consultation (session continuity). When both gstack-review (Claude) and /codex (OpenAI) have reviewed the same branch, gstack surfaces a cross-model analysis of which findings overlap and which are unique to each.

gstack’s signature realization of pattern-cross-model-review — get an independent second opinion from a different vendor’s model — shared with Compound Engineering (whose ce-code-review runs an adversarial + cross-model pass). The adversarial-challenge mode also applies pattern-adversarial-review. Also the quality gate behind gstack-spec.

See Also

• gstack-review — the Claude-side review this is cross-analyzed against.
• gstack-spec — uses /codex as its spec quality gate.
• ce-code-review — Compound Engineering’s cross-model review.
• pattern-cross-model-review — the technique.
• stage-review — the canonical stage this implements (Review side).