9 workflows from people who use both
Claude Code vs Codex: how people actually split the work
Last updated · by Thomas, editor · How we verify
Most “Claude Code vs Codex” posts pick a winner. The people in these recipes mostly don't. They give each tool a job, pass work between them, and use the second tool as a reviewer that didn't write the code.
Every recipe below links to the post, repo or doc it came from. Where we wrote our own version of a prompt, it's labeled as ours.
Which split fits you
Each card is one way people divide work between the two tools. Tap a title for the full recipe.
Claude Code builds, Codex reviews
Use one agent as the builder and the other as a second pair of eyes that hunts bugs and challenges architecture before you accept the result.
⏱ Setup: 5 min✋ You pick which findings get fixedRoute stuck bugs to the other agent
Features in Claude Code; stuck bugs and review in Codex
⏱ Setup: 2 min✋ You revert partial edits before switchingThe writer never reviews its own lane
Builders from one vendor; reviewers from another
⏱ Setup: 10 min✋ Nothing merges without your sign-offClaude Code ↔ Codex hand-off with a shared changes.log
Either builds; the other reviews and improves
⏱ Setup: 15 min✋ You read each entry before the next runSplit work: Claude Code reasons, Codex executes
A backend developer on 20+ microservices routes reasoning-heavy debugging to Claude Code and repetitive, parallel work (tests, docs, edits) to Codex, with a task-state log between them.
⏱ Setup: 10 min✋ You decide when they disagreeVoice notes → Claude cleans → Codex executes
Speak rough thoughts into Obsidian, let Claude Code turn them into clean prompts, then run and critique those prompts in separate Codex threads.
⏱ Setup: 30 min✋ You approve the plan before any buildA personal operating contract for Claude Code and Codex
Claude plans; Codex reviews
⏱ Setup: 20 min✋ You merge PRs and flip feature flagsDone-when lists and a two-try stop rule
A lead agent hands bounded pieces to others
⏱ Setup: 1 hour to set up✋ You approve the done-when list and mergeTell Claude and Codex how to use your second brain
Both read your company and personal notes first
⏱ Setup: 10 min✋ No note edit without your OK
Details come from each recipe's source. Setup time is shown only where the recipe states it.
One builds, the other reviews
The most common split. A reviewer that didn't write the code catches different mistakes.
Claude Code builds, Codex reviews
Use one agent as the builder and the other as a second pair of eyes that hunts bugs and challenges architecture before you accept the result.
Route stuck bugs to the other agent
When one agent loops on a bug for hours, hand it to a different agent; this developer settled on Claude Code for features and Codex for bug fixes and review.
The writer never reviews its own lane
A fleet rule: whichever model wrote a piece of work never reviews it; a different vendor's agents review every lane, and repeated failure forces a redesign.
Hand-offs through a shared log
Both tools read one file first and write to it last, so neither starts cold.
Claude Code ↔ Codex hand-off with a shared changes.log
Two agents pass one project back and forth through a single log file each must read before starting and append to after finishing, so the second agent can review the first.
Split work: Claude Code reasons, Codex executes
A backend developer on 20+ microservices routes reasoning-heavy debugging to Claude Code and repetitive, parallel work (tests, docs, edits) to Codex, with a task-state log between them.
Voice notes → Claude cleans → Codex executes
Speak rough thoughts into Obsidian, let Claude Code turn them into clean prompts, then run and critique those prompts in separate Codex threads.
One rulebook for both
A single instructions file both agents load, so you stop re-explaining how you work.
A personal operating contract for Claude Code and Codex
One standing contract both agents load automatically: Linear ticket first, Claude plans, Codex reviews, isolated worktrees, test-first, and independent review before any PR.
Done-when lists and a two-try stop rule
One lead agent (Claude Code or Codex) splits each task into bounded pieces for other models in separate worktrees, checks every report against a done-when list, and scales review to how hard a change is to undo.
Tell Claude and Codex how to use your second brain
Standing custom instructions that force agents to read your company and personal brains before every task, flag conflicts, and propose exact edits only after you approve.
How to choose
- Start with review, not parallel building. Having the second tool review the first one's branch takes minutes to set up and needs no shared files. (recipe)
- Add a shared log once you hand work back and forth. The changes.log pattern exists because both agents otherwise start each session without context. (recipe)
- Keep one rules file. Several recipes point CLAUDE.md and AGENTS.md at the same file so the rules can't drift. (recipe)
- Never let both write at once. The failure lists repeat it: separate branches or worktrees, and sequential hand-offs.
Common questions
Is Claude Code or Codex better?
The people in these recipes don't settle it. They split by job: in one, Claude Code builds features and Codex fixes stuck bugs and reviews; in another, Claude Code traces root causes and Codex runs tests. Model versions change often, so they route by what works on their own code.
Can Claude Code and Codex work on the same repo?
Yes, if they don't edit the same files at the same time. These recipes use separate branches or git worktrees and pass work through a shared log file.
Do I need both subscriptions?
For these workflows, yes. Each recipe lists what it needs in its facts box.
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