Codex and Claude Code are sold as the same thing: a subscription that lets an agent work on your repository. Their limits are not shaped the same way, and the difference is large enough that the same person can be perfectly comfortable on one and constantly blocked on the other.

Here is the structural comparison — not the numbers, which change, but the shape of the constraint.

The axis that matters: where the pressure lands

Every plan has two caps: a short one that governs bursts, and a long one that governs total volume. What differs between vendors is how far apart they sit.

When the two caps are far apart, the short one does the work. You get blocked briefly, you wait, you continue. The experience is annoying but self-correcting, and heavy agent use is survivable.

When the two caps are close together, the long one does the work. You do not get a short interruption; you get an afternoon off, or a day. The experience is qualitatively different, and it is the one that sends people looking for alternatives.

This is why comparing "how many hours do I get on Pro" across vendors is misleading. The number that matters is the ratio between the caps, and neither vendor publishes it clearly.

Working styles, matched

Long autonomous agent runs. Codex tends to suit this better in practice, because a run that takes twenty minutes consumes a lot of capacity in a very short span — exactly the pattern a well-spaced short window is designed to allow. On a plan where the long cap is the binding constraint, the same run pattern is expensive.

Many short, interactive exchanges. Claude Code's shape suits this. Lots of small requests spread across a day read as low burst pressure, so the short window rarely bites. The risk is drifting into the long cap without noticing, because nothing ever told you to stop.

Bursty, deadline-driven work. Whichever vendor you use, this pattern is the worst fit for any rolling window. You will spend the outer cap fastest, and you will hit the wall on the day you least wanted to.

Both reset, and resets do not compare either

Both vendors issue resets. They are not on a schedule, they are not symmetric between the two, and a reset for one tells you almost nothing about the other except that the competitive pressure is real.

The practical implication: if you are trying to decide which plan to be on, do not decide it on reset cadence. Decide it on which cap shape matches how you work, then treat resets as upside on either side.

The cost of running both

A lot of heavy users end up here, and it is a rational answer to the rolling-window problem: when one is exhausted, work in the other.

It works. It is also how people end up paying for two subscriptions and still getting blocked, because the failure mode is not capacity — it is knowing which one is available right now. Two tools means two usage panels, two sets of limits, and twice the polling.

If you go this route, the thing worth automating is not the pricing analysis. It is the awareness.

A short checklist

Before committing to a plan, ask:

  • Which cap binds first for my pattern — short or long?
  • Does the tool show me the outer cap, or only the responsive inner one?
  • Can I move work between models or tiers when one is spent?
  • Do I need resets to be survivable, or is my work interruptible?

Only the last question is about resets. It is worth being explicit about that, because the reset conversation is loud and it can crowd out the question that actually determines whether a plan fits you.

ResetRemind tracks confirmed resets across Codex, Claude Code, Grok and Gemini, and emails you for the plans you choose — so running two tools does not mean polling two dashboards.