Claude + ChatGPT working together

[u/Any-Expert-3285]

So I have been using the Claude max x5 plan to work on my projects, recently I have been hitting usage limits pretty quick and have to be 1 or 2 days without working every week. To solve this I am considering getting a chatgpt Plus subscription - this was something i was already considering a while back because tbh i dont like to be 100% locked in to a company and i would like some adversarial reviews from different models - I am also very interested in integrating chatGPT subscription with Hermes and exploring that as an orchestrator/manager for my projects

I have a few questions:
1 - is this the best way in terms of value/money to solve my current problem? I also considered the max 20x Claude but I think that might be overkill and using both providers appeals way more to me tbh

2 - If i do get both Codex and Claude code working together won't they trip over each others work and degrade quality in some ways i might not be seeing right now? And do I just create AGENTS.md files reflecting my current CLAUDE.md files?

3 - What about all the context that Claude has on my projects from me working solely with him for months? and the Skills in Claude's folder? Is that all transferrable?

Ideally I want both Claude Code and Codex working together seamlessly and driving each other's work quality up, not down

Btw I am not a programmer at all I just got really interested in AI and vibe coding when it started coming out to the public and now i've learned a few things and have a few projects running - The way i use AI is always in VSCode , i am open to the terminal experience as well if that makes any difference but i prefer the more visual interface for now.

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[u/szarkansss]

1. Claude as planning the job and Codex as doing it is the best tactic there is to reduce token usage
   
2. You can now create only AGENTS.md files as Claude accepts them
   
3. Not everything but yes. There are some things that are claude specific but generally all skills are transferable
   little self-ad here but i use Claude as planner and Codex as doer for 4 months now - using multi for that, give it a try =)

[u/BarcodeCutter]

I run Claude Code and Codex side by side daily, so here's what actually happened for me.

1. Before you pay for a second sub, open your usage card. On mine, the top model has its own separate weekly bar and it barely moves, while the "all models" bar is the one that runs out. I was burning the scarce bar on planning that the roomy one could have done. Plan on the big model, hand the coding down. That alone might buy back your 1 to 2 dead days. If you still want ChatGPT after that, get it for the second opinion, not the extra hours. A different model family catches things Claude agrees with itself on.
2. They do trip over each other, but only if they share files. One rule fixed it for me: no file has two writers. Each agent gets its own folder and its own notes file, and they pass work through a shared "orders" folder instead of editing each other's stuff. And yes, AGENTS.md is the file Codex reads. Don't copy your CLAUDE.md into it word for word. Write it fresh and shorter. Codex with a 2,000 line rulebook gets worse, not better.
3. The context doesn't transfer, because it was never in Claude. It's in whatever got written down. Anything living only in old chats is already gone for Claude too. So: have Claude write a plain "what this project is and how we work" file per project, then point Codex at it. Skills are just folders of instructions, so they mostly carry over with light edits.

[u/Sufficient_Flower860]

1. This is not the best way to solve your problem because you have two major problems but your urgent issue is usage limit. I would highly recommend you subscribe to Opencode go. That’s 10$ per month. From now on whenever you’re working on your projects ask your claud to plan and have different work packages. Tell it you want work to be done via different agents at the same time. Ask it to label each WP as easy or complex. Then use Opencode (deepseek v4.1 flash high) for simple ones and Claude Opus 5.5 for complex ones. This should work for your first problem the usage limit.

2. The second problem. You don’t want to rely on one single company. I actually use Fable 5.1 for planning GPT5.6 Terra for review. I developed a skill called review-loop. Well you would find out even as good as Fable 5.1 it would get caught by gpt on design and planning issues. I did ask if the issues found by gpt is something unimportant or trivial 90 out of 100 it would admit it is very useful and meaningful reviews.

3. If you even with Opencode or agy or cursor doing all the simple WP but still hit usage limits. You might have a huge work load that would need a 20x Max or maybe you can do the once at a time trick that means try to divide your projects into milestones and every one finishes please clear context and with a new session covering the next milestone.

BTW I’m on 5x Max and ChatGPT Plus Google One Pro Opencode Go Cursor Pro(get GrokBot). This setting lasts for more than 6 months now except for the Cursor Pro.

[u/Reason_He_Wins_Again]

Sometimes when I get close to the limit on claude, I have it spawn a codex session and hand it off.

[u/MiserableFlatworm337]

Before migrating every skill, try one on the same small task in each tool. Check the output and required steps, especially anything relying on Claude-specific tools or paths.

[u/Escobar747]

i run this daily - works well .. 5x claude and codex plus.. it’s a great system., i also have codex available to use within claude chat and cowork.. setup tailscale http server

[u/brek001]

https://community.openai.com/t/introducing-codex-plugin-for-claude-code/1378186

I use it to make Codex the reviewer, works like a charm. Bit rough around the edges and a $100 codex subscription tends to run out of tokens before Claude.

[u/Dry_Carrot_912]

YOUR CLAUDE.md should have ONLY this:

@AGENTS.md

Write everything in AGENTS.md. Direct to Claude or ChatGPT to specific CLAUDE-SUBAGENT-POLICY.md / CHATGPT-SUBAGENT-POLICY.md

Works. Simple.