How to check your Codex usage limit (and when it resets)
Written by GuruHat, which makes AI Meter. Checked in October 2026; OpenAI adjusts Codex limits by plan, so its help pages have the current numbers.
Short answer: in the Codex CLI, run /status to see your current usage limits and when they reset. ChatGPT also shows Codex usage in its Codex settings. To keep the number on screen, AI Meter by GuruHat puts your remaining Codex allowance and reset time in the Mac menu bar or on the Windows taskbar.
How Codex limits work
When you sign in to Codex with a ChatGPT plan (Plus, Pro, Business and so on), your usage counts against that plan's allowance. Like Claude Code, it's measured in a short rolling window plus a longer weekly window, and how far it goes depends on the size of your tasks. Signing in with an API key instead bills per token, with no plan windows.
Option 1: /status in the Codex CLI
Type /status in a Codex CLI session. Alongside the model and session details, it shows how much of your usage limits you've used and when they reset.
Option 2: ChatGPT's Codex usage settings
Signed in to ChatGPT on the web, open Codex and its settings to find your usage. It's useful when you're away from your terminal.
Option 3: keep it on screen with AI Meter
AI Meter by GuruHat is free and open source (MIT). Choose Codex in its menu and it shows your remaining allowance as AI 79% in the Mac menu bar or on the Windows taskbar, with the exact reset time one click away. It reads the ChatGPT sign-in the Codex CLI saves in .codex/auth.json in your home folder, refreshes every five minutes, and only sends your token to OpenAI.
Use Claude Code too? The same app switches between Claude and Codex. See how to check your Claude Code limit.
Frequently asked questions
How do I check my Codex usage limit?
Run /status in the Codex CLI, or look at Codex usage in ChatGPT's Codex settings. AI Meter by GuruHat keeps the remaining percentage and the reset time in the Mac menu bar or Windows taskbar.
Does AI Meter need an OpenAI API key for Codex?
No. It uses the ChatGPT sign-in that the Codex CLI already saved in .codex/auth.json. Sign in once with the Codex CLI and AI Meter picks it up.
Is Codex usage shared with ChatGPT?
Codex usage counts against your ChatGPT plan's Codex allowance. OpenAI's help pages list the current limits for each plan.