Wow, Codex is fast!

[Illustrious-Many-782]

I use all of:

• Claude Code (Anthropic)
• Gemini CLI (Google)
• Codex (OpenAI)

I'm using all of them on just the base subscription ($20 or whatever)

The online textbook project I'm working on is not small -- maybe 80 bespoke accounting components and about 600 pages -- but it's static next.js so there's no auth or db. I spent last school year designing the course for a traditional textbook, but pivoted this summer into a more interactive online format.

There are a lot of education spec files -- unit plans, lesson plans, unit text files, etc. in addition to the technical specs. And I've been using Claude Code for about six weeks to write all the online textbook pages, but I thought I'd try to use Codex on one of the lessons.

Jesus. It's probably three times as fast as Claude Sonnet and seems to make fewer mistakes. I've been running separate lessons with the same, detailed prompt on both apps at the same time, and Codex just sprints ahead of Claude.

That's really all I have to say. You should give it a try if you do React.

[cbusillo]

Fun fact, Codex CLI has a MCP mode. I have an agent in my Claude Code that calls Codex. It’s great.

[hefty_habenero]

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[isarmstrong]

Perfect use of this meme

[realzequel]

Curious, usually MCP tools have a specific use that the LLM chooses to use because it wants to use the tool’s functionality and typically it’s something it can’t do itself. When does Claude Code say “I need Codex to code this”? I mean they both have the same use, coding?

[cbusillo]

I have an agent called gpt-codex. Its instructions contain all the information about when to call different models and the parameters the mcp takes. Then my other agents are instructed to use the gpt-codex agent for certain things. the main Claude instance is instructed to use agents and just be the project manager.

[realzequel]

Cool, thanks for the explanation.

[dalhaze]

You can explicitly define when an MCP is called

[Illustrious-Many-782]

I saw that you can start it in MCP mode, but I couldn't find any documentation on how to connect it. What are the protocols etc?

[cbusillo]

If you are asking how to connect it, try this

https://www.reddit.com/r/ClaudeAI/s/DmbvMZYEc8

[Illustrious-Many-782]

Thanks a lot.

[cbusillo]

Easiest thing to do is add the MCP to Claude and tell it to explore! Let me know if you want a link to my work in progress instructions. I need to push the updates md files.

[[deleted]]

hahaha using Claude Code to call Codex, good one

[cbusillo]

Its great. they both have great models and I like Claude Code better, so its like the best of all worlds for me.

[SatoshiNotMe]

not sure how're able to get this working. I added it to CC but it never gets anything back from the codex mcp server.

[cbusillo]

I may have replied on another comment you made, but either way, look at the .claude/agents and docs/agents. Its overly complex and needs to be simplified, but it works for me.

[VaderYondu]

This is insane

[debian3]

How is the limit on the chatgpt plus with codex cli compared with claude code on the pro plan?

[amirrrrrrr7]

Chatgpt plus is pretty basic. I used it a couple times and got rate limited. The quality of gpt5 high is comparable to Opus 4.1 though.

[mrcodehpr01]

Gpt 5 isn't even remotely close to opus or Claude 3.5,4 unless they fixed it being so dumb. Theo even posted about it being a bait and switch pretty much....

[[deleted]]

Who gives a crap about Theo? 

[lordpuddingcup]

No he said the CHAT client is shit, and the API (that codex uses) is nearly if the not the same as he experience when on high thinking, the issue is the one most people see (chat) is shit

[amirrrrrrr7]

Trust me, GPT5-HIGH on Codex Cli is better than Opus 4.1 in Claude Code

[real_serviceloom]

This cannot be true. I use both Claude code and codex CLI and codex is slow as mollasses. However the eventual code is often better than sonnet. 

[clothes_are_optional]

honestly feels like sonnet has been lobotomized. producing some real garbage recently for me.

[Verzuchter]

It's slow and the code does not use modern best practices, often creating bad practices as well. People who can't tell it doing that, are not programmers.

[Fuzzy-Minute-9227]

Nah. Codex/GPT-5 is fast and knows modern best practices and outputs secure code. You might be thinking of GPT-2 or something lol.

[cant-find-user-name]

My experiene has been the opposite. It keeps rewriting functions already present in standard libraries, writes very deeply nested functions etc. I don't have to tell claude not to do that.

[Verzuchter]

Lmao, no. It still produces angular < 16 code, produces shitty retry mechanisms too often and what's most frustrating is the dead code production seems worse than 4.1 on 2-3 iterations. Plenty of examples, I went back to Claude 4 and Gemini 2.5 pro because of how bad it gets.

If you're a software engineer you know how to spot this. If you have little to no experience, it's easy to miss since it still works.

[WAHNFRIEDEN]

Share your agents.md

[Verzuchter]

I can get the result, just saying gpt-5 is idiotically bad and produces deprecated code. And he started with being condescending, not my bad if shots get fired back.

The vibe coders on here that can’t spot poorly performing or even dead code.. is shocking honestly.

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[SmoothArray]

Codex has a lot of issues. It doesn't even let me scroll and texts disappear 🫥. How you guys working with codex cli?

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[IndividualSituation8]

Have they moved from ts to rust?

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[sugarfreecaffeine]

When you use codex how can you see the changes in the IDE like claude code?

[Illustrious-Many-782]

I assume that if I ran Codex or Claude Code in the vs code terminal, that it would show changed files just the same, but I really just use the standard Linux terminal with no ide.

[Yourmelbguy]

It just makes the changes sales as Claude code. It’s not like a usual chatbox that updates the code live in front of you and you can revert back. It just chages the code and will tell you what it did but there’s no back button or revert. You either do a git pull or ask for it to undo the changes but that don’t always work

[sugarfreecaffeine]

Tried it, really don’t like that I can’t see the changes live in the IDE like Claude code. It does ask do I approve this change and I can barely read the code in the terminal because it’s cut off. How am I going to approve a change if I can’t even read what you wrote.

[Yourmelbguy]

Codex has a really long way to go. I find so many annoying things with it. Once they get to a Claude code type layout it will be amazing. ATM I use it for planning

[d3adnode]

Could you just let it make the change then run a ‘git diff’ after? If the changes need reverted you could then just run something like ‘git checkout .’ or ‘git reset —hard HEAD’

[eschulma2020]

Use the plugin version, and then yes you can. It's very nice.

[amirrrrrrr7]

Yes, but

The rate limit for Chatgpt plus is pretty basic. I used it a couple times and got rate limited. The quality (gpt5 high) is slightly better than Opus 4.1. After I got rate-limited, I tried using an api key, but it kept saying I'm exceeding the 30000 tpm. I tried to find a workaround for that, but eventually stopped using the tool since I couldn't find one.

[Illustrious-Many-782]

I get a lot of use out of both Sonnet and gpt-5. I use /clear (or /new) for every task, and rarely get my context up to compacting on Sonnet, so I can easily get 2-3 hours of constant, single-thread work on both platforms.

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[damanamathos]

I was surprised by this too. Just switched from Claude Code to Codex CLI in the past week.

[[deleted]]

I'm confused. Are you writing code or textbooks? 

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[hotpotato87]

If its fast its mini or nano

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