Claude to Codex
Claude Code produces the design or implementation. OpenAI Codex receives the independent, read-only review packet and returns structured evidence.
CLAUDE + OPENAI CODE REVIEW
Claude authors. Codex reviews.
Or reverse the roles.
2nd Engineer treats Claude and OpenAI as interchangeable author and reviewer roles. The control plane remains constant while teams choose the model pairing that fits each workflow.
Claude → CodexCodex/GPT → ClaudeSame evidence contractOwner controlled
THE CONTROL GAP
AI review needs more than another opinion.
Codex to Claude
Codex or GPT produces the change. Claude reviews through the same bounded contract, with the same evidence and stale-result requirements.
Policy stays model-neutral
GREEN, RED-DESIGN and RED-CODE routing is deterministic. One model never decides whether the other model should be called.
Evidence stays comparable
Both directions record the review subject, model role, fingerprint, verdict, findings and owner decision in a consistent assurance record.
HOW 2ND ENGINEER WORKS
Assurance that follows the change.
2nd Engineer governs when a second model is called, what exact state it receives, what evidence it must return and who has authority to decide.
- 1
Choose role assignments
Select Claude or OpenAI for authoring and assign the other model as the independent reviewer.
- 2
Apply one project policy
The same consequence rules route review regardless of which vendor occupies each role.
- 3
Use one evidence schema
Reviewer responses are normalized into verdicts, grounded findings and verification steps tied to the snapshot.
- 4
Preserve one owner gate
The model pairing can change; human authority and exact-state approval do not.
AI CHANGE ASSURANCE
Give every consequential change an independent engineering checkpoint.
Start with one team, one policy and a reversible author-reviewer workflow.