I can't see why anyone still chooses Claude. Codex outperforms it in most respects, and its quotas are about ten times larger. A $100 Codex plan gets me through the whole week with 6–12 hours of coding per day.

I found GPT 5.5 is pretty solid, but I keep getting impressed by opus. It's tracked down some insane stuff while I look away during a meeting. 5.5 is way closer than previous OpenAI models to Anthropic IMO.

These things are so tricky because everyone has a seemingly conflicting experience. Part of the fun I guess!

I've never actually run into the issues that people talk about online, like Claude suddenly getting dumb or running out of usage. So there's just not a lot of incentive for me to shop around. I've used Amp a bit, and it's quite nice, but a bit more expensive without the subsidized subscription.

One reason might be that Claude Opus 4.7 thinking benchmarks better on Arena Coding at https://arena.ai/leaderboard/text/coding ... hopefully that effectively assesses correctness. It doesn't account for reliability though.

Claude is the only AI coding tool I've found worth a damn. Without it I'd just do everything by hand save for a few bash scripts or whatever.

I certainly get more usage before cutoff from GPT 5.5, but the output I get from Opus 4.7 is way better. It just sucks that I get 2 good "long running" prompts on Opus 4.7 before my daily quota is met on the $20 subscription.

I think it's impossible to say that codex x.y.z is better than Sonnet x.y.z, I used many "high" end models and they're just all good.

Corporate policies and agreements. In large corporations, using external non-approved models with proprietary source code is a good way to have significant career issues.

You get a discount for paying for a full year on Teams and Enterprise can involve contractual obligations. It's a lot of effort to get buy-in to change providers and to shift an entire organization. The winds change frequently in this space and the pain needs to get to a certain level before it's worth rolling the dice.

Claude Max 20x gives me unlimited (for my level of usage) Opus 4.7 - how much money do I have pay OpenAI for that?

But 100$ Claude subscription also gets me easily entire week of coding 6-8 hours a day? What on earth do you do to run out of limits on Max? Do you vibe multiple new codebases every day for a living? The benefit of Claude is also not gaslighting me every time I tell it it's wrong.

In my org the teams doing agent engineering at scale are all on Codex using gpt-5.5. By scale I mean fully agent authored code workflows with long running / multi hour plans.

I'd rather not give money to Sam Altman.

Claude is (per benchmarks) much worse at instruction following, but is more charming and deceptive and anthropomorphized by default (in name and image), leading to productivity assessment psychosis

Corporate reasons. AWS hasn't opened codex models to everyone yet.

Claude is significantly better at Rust in my experience, and Rust is my favorite language to emit from LLMs.

Opus 4.7 + Rust is a killer combo.

because my shard isn’t erroring

I use Codex when Claude Code is down, and I only began using Claude when ChatGPT was down

yes codex is very fast, I go back to Claude for now

Because of marketing and vibes mostly.

Heck I prefer DeepSeek to both of those.