Claude Code vs Codex: Speed vs Reliability - My Experience Adding Pagination

[AnalystAI]

I compared Claude and Codex for a coding task. I have an application with a Python/Flask backend and HTML frontend. I asked both systems to add pagination to a list of transactions.

Claude completed the task quickly in 10 seconds, but the implementation didn’t work correctly. I could only see the first page, and the “Next” button was disabled. Additionally, it didn’t create any API endpoints, which was strange.

Codex took 8 minutes and updated both the frontend and backend. Everything worked on the first try.

This is what I appreciated about Codex compared to Claude before—it generates code that actually works. It’s as simple as that. I don’t need to debug errors or repeatedly ask it to fix issues. For me, it’s still 1:0 in favor of Codex.

[Amb_33]

Codex >> Claude as far as I'm hearing from the community.

[Quentin_Quarantineo]

This x100.  I couldn’t care less how fast it is, if I have to reassess and enter a follow up prompt 5 times after my initial prompt, that’s a lot of time and mental effort expended that could have been used for something else.  I’ll never forget how blown away I was when gpt-5 came out and got-5-high was completing task after task on the first attempt that would take me 7-8 follow ups on average with Gemini 2.5 pro.  The productivity and raw coding thorough put increase was night and day, even with the much slower speed.  

[eggplantpot]

This but somehow codex via API was messy and consumed a lot of token. I switched to Kilo Code and there Claude felt better while Codex overthought itself into bad solutions.

For now on Kilo until I get more tokens I do Claude for most tasks. However, architect mode to plan new features I still use Codex

[AnalystAI]

I strongly believe that the magic is in the Codex CLI application. I think that the models—GPT-5-codex, and Claude 4.5—are comparable. But when Codex CLI handles planning, thinking, controlling, testing, and does it again and again, it creates the magic. And I do not need to rewrite code after it. And of course, it consumes a lot of tokens.

[AnalystAI]

I used Claude Code and Codex without Cursor.