1In short
Morion is not a third agent. It is the notebook, the task board and the workflow that Claude Code and Codex both use: one memory with the source of every claim, tickets either agent claims, and a loop where one agent writes, another reviews, and you merge the result. The reviewer can be Codex, Claude, or an open model such as Kimi, GLM or DeepSeek.
Claude Code and Codex are the two agents most developers choose between, and many end up running both. Each is strong on its own, and each remembers only its own sessions. Below: the two in brief, then how to run them as one loop.
2Side by side
| Claude Code | Codex | Both, with Morion | |
|---|---|---|---|
| Runs in your terminal, on your machine | |||
| Parallel agents inside one task | |||
| Memory across sessions | |||
| Memory the other vendor’s agent can read | — | — | |
| Answers that cite the source note, with a status | — | — | |
| Task board you and the agents both move | — | ||
| Review by the other vendor’s model | |||
| Workflow that stops and asks you in chat | — | — | |
| Each step on its own model, open models included | |||
| Cloud runs with the laptop closed | — | ||
| Pull request review on GitHub | — |
has it, has part of it, — does not. Claude Code and Codex as documented by their vendors in September 2026. The third column is both agents connected to Morion: Morion adds rows, it does not add cloud runs or a pull request bot. Claude Code’s task list is a checklist, not a board; cross-vendor review in the first two columns means OpenAI’s Codex plugin for Claude Code. Either agent can be pointed at another provider’s model for a whole session, but every agent in that session then runs on it; in Morion each step of a workflow names its own agent and model. Codex memories are off by default and global, not per project.
3The two agents in brief
Claude Code is built for handing off whole tasks: dynamic workflows and auto memory are built in, and agent teams are an experimental option. Every agent in it runs on Claude, and its memory stays on one machine, read by Claude only.
Codex comes with every ChatGPT plan and is known for generous limits, careful review and cloud tasks. Its subagents run on OpenAI’s models, and its memories are global, off by default and written by the agent.
You can run both, one writing and the other reviewing. Neither gives the pair a shared memory, a board or a step that stops for you.
4Running both today
Developers who run both describe the same few patterns: Claude plans and Codex implements, or Claude writes and Codex reviews and takes the plan apart. Most move the plan and the diff between terminals by hand.
In March 2026 OpenAI published an official Codex plugin for Claude Code. From inside a Claude Code session you ask Codex for a review, hand it a task, or move the session over to Codex; an optional gate runs a Codex review each time Claude finishes.
The plugin is one call: one Claude session asks Codex for one review or one task. It does not build a chain of steps, such as a plan, a plan review, the code, a code review, documentation and QA, each on its own agent and model. It has no second reviewer, no model beyond Claude and Codex, no place where the plan, the decisions and the tickets live between sessions, no board, and no step that asks you in chat.
5Both agents on one board
Morion is a notebook and a task board on your machine. Claude Code and Codex both connect to it over MCP, with one click each. What changes for the pair:
- One memory. Both agents read and write the same notes. Mo indexes them into projects and topics and answers with the source note and a status on every claim: decided, provisional, superseded.
- One board. Tickets sit in columns from Backlog to Done. Either agent claims a ticket, and a claim is atomic, so two agents never take the same one.
- A work packet per ticket. The agent that picks up a ticket gets the ticket, the related notes, the decisions and the linked tasks in one call, whoever wrote them.
- Claude writes, Codex reviews, as a workflow. The default Auto-code template runs a ticket through a Mo gate, Claude in a worktree and a Codex review, with Claude as the fallback reviewer. If Codex asks for changes, the work goes back to Claude in the same run. A human_gate asks you in chat only when Mo sees a question after Claude’s step, and your reply resumes the run. When the review passes, the ticket moves to Done with the diff on its own branch: you merge it with one click, or let the folder auto-merge. A failed run lands in Re-opened with the reason.
- Longer chains. Other templates add steps: a plan and a plan review before the code, or documentation and QA after the review. Build your own in the visual editor: several development and review steps, branches, and a gate wherever you want to decide.
- A third opinion from an open model. The review step does not have to be Codex. Give it the opencode or pi agent and a model such as Kimi, GLM or DeepSeek, through OpenRouter, paid per token, or a local Ollama, and a third vendor checks the diff without a second subscription.
Step by step: Claude writes, Codex reviews. Swap the slots and Codex writes while Claude reviews, or put an open model in the review slot.
6What Morion does not replace
Morion is not a coding agent. You still need Claude Code, Codex or both, signed in with your own subscription; Auto-code runs on those logins, indexing on the Claude Code login (or the Codex login on macOS), and both can use a provider you connect. There are no cloud runs, so the machine has to be on. There is no GitHub pull request bot: the review happens inside the workflow, before the diff reaches your main branch. One license runs on one machine.
7Questions
Neither wins everywhere. Codex comes with every ChatGPT plan and is strong at careful review; Claude Code is built for handing off whole tasks, with orchestration built in. Run both on a real ticket from your own repository; the difference shows within a day.
For one step at a time. OpenAI’s Codex plugin lets a Claude Code session ask Codex for a review or hand it a task. Morion’s Auto-code runs the whole chain as a workflow: plan, code, several reviews and documentation, each step on its own agent and model, Claude, Codex or an open model such as Kimi, GLM or DeepSeek, with the ticket and its notes as the input, and a gate that asks you in chat when a step needs you.
Codex comes with every ChatGPT plan, the Free plan included, and developers often cite its limits. Claude Code needs a paid Claude plan from Pro up. Both sell usage past the included limits.
No. Claude Code’s auto memory is read by Claude only, and Codex memories by Codex only. Both read AGENTS.md, which holds rules, not project memory. A notebook both agents connect to over MCP gives them one memory.
No. Morion works with either agent alone, and with Cursor, Cline, Zed or any MCP client. The workflow where Claude writes and Codex reviews needs both CLIs installed and signed in; the review step can also run an open model such as Kimi, GLM or DeepSeek through OpenRouter or Ollama. Plans are on the pricing page; there is a Free plan.
Sources: the vendors’ product pages, docs, changelogs and pricing pages, checked on 25 September 2026.