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These days I reach for Codex CLI more than Claude Code. Not just for token economics, Codex has been catching up fast and is already ahead in some areas. It was open source from day one, arguably better code quality than the leaked Claude Code source, yet nobody cared.
Hacker News • HackerNews • Use case: General coding assistance, used more than Claude Code.
The AI solution worked, passed all the tests the AI wrote for it, but it was still very very wrong. I had to look at the code to understand it did this.
Hacker News • HackerNews • Use case: Implementing function calling in a programming language
Claude Code, Codex, and other coding agents still hallucinate library APIs even when you tell them to 'read the docs'.
Reddit • Developer • Use case: Getting coding agents to use correct library APIs
What I’ve been doing lately is asking Codex (or similar tools) to explain what a file or function does
Reddit • Developer • Use case: Understanding code files/functions instead of writing line by line
I’ve mostly switched to Codex (GPT-5.4 high) over Claude Code (Opus 4.6) in the last few weeks. I think my style of workflow and prompting seems to generate a bit better results with it.
Hacker News • HackerNews • Use case: AI coding assistant for workflow and interacting with a custom CLI issue tracker
So far it has been much more generous with usage and more accurate than Claude for the kind of work I do. That said, Codex has its own issues. Its personality can be a bit off-putting for my taste.
Hacker News • HackerNews • Use case: AI assistant for backend logic, hard debugging, and complex problem-solving
I have since moved to Kiro for my IDE and Codex for my CLI and am as happy as clam with this new setup.
Hacker News • HackerNews • Use case: CLI
I threw in the towel last night and switched to codex, which has actually been following instructions.
Hacker News • HackerNews • Use case: Using the AI coding agent for code generation/assistance after switching from Claude
everyone's in the comments right now saying codex doesn't finish work. codex is dumb. codex can't handle complex tasks.
Reddit • Developer • Use case: Handling complex tasks and finishing work
I find Codex is decent but not always great.
Reddit • Student • Use case: Agentic AI coding for Nuxt website with Directus API
With Codex I have to always specify 'Don't implement change, just tell me' and even then it sometimes breaks out and just does stuff.
Hacker News • HackerNews • Use case: Coding tasks and analysis, compared against Claude.
I asked Codex to read rules and memories from where Claude Code stores them on the filesystem and merge them into `AGENTS.md` and this actually works better
Hacker News • HackerNews • Use case: reading rules and memories from Claude Code's filesystem and merging them into `AGENTS.md`
Codex would never ask this and just simply look these up during planning and whenever it encounters ambiguity it would either ask straight away or put it as an open question.
Hacker News • HackerNews • Use case: AI coding assistant for planning and implementing tasks/features
I use codex daily, but it's also clear to me that open source is catching up quickly.
Hacker News • HackerNews • Use case: daily use
asking it to build the foundation for a long-term project has been disastrous in my experience. When you give it a blank canvas and a lot of autonomy it will likely end up generating crap code at a staggering pace.
Hacker News • HackerNews • Use case: building the foundation for a long-term project
it does amazing kernel work (Codex-5.4)... Once TMA gets involved both Claude and Codex spin endlessly until they dump TMA for a slower fallback.
Hacker News • HackerNews • Use case: Kernel work (Codex-5.4), specifically with WGMMA + TMA operations
I have z.ai and kimi subscription when i run out of tokens for claude (max) and codex(plus).
Hacker News • HackerNews • Use case: General AI tasks (primary tool until token exhaustion)
I've been messing with using... Codex... for reverse engineering... it's a ton of fun. Great because matching bytes is a scoring function that's easy for the models to understand and make progress on.
Hacker News • HackerNews • Use case: reverse engineering, matching bytes as a scoring function
I'm happy I invested in setting up Codex CLI and getting it to work with ollama.
Hacker News • HackerNews • Use case: setting up and using it to work with ollama
It works whether I use codex or claude. I lean more towards codex since its cheaper.
Hacker News • HackerNews • Use case: completing small, straightforward coding tasks as part of a parallel workflow
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