AI coding assistant comparison: how the limits differ
Claude Code, Codex, Cursor and Copilot meter usage in four different ways. The limit model matters more than the feature list.
By ClaudeGPT Si Newsroom, Editorial team··3 min read
Most AI coding assistant comparison pages rank features, but the thing that decides your day is how each tool meters usage and when it lets you back in. Claude Code, Codex, Cursor and GitHub Copilot each use a different limit model, and if you pay for more than one, UsageAtlas, a free and open-source desktop app, puts all their reported limits and resets in one window.
Why compare limits, not features
Feature lists are long and change with every release. What differs more is the shape of the allowance: a short rolling window, a weekly cap, a monthly credit pool, or a mix. That shape decides whether a long refactor finishes today, whether a heavy Monday leaves you stuck by Wednesday, and how predictable your bill is.
The four limit models side by side
| Assistant | How usage is counted | When it comes back | Overflow option | Built-in view |
|---|---|---|---|---|
| Claude Code | A session cap and a weekly cap, one pool with the Claude apps | Every five hours (rolling) and every week | Usage credits or a larger plan | /usage |
| Codex | Messages, which cost more on bigger models and tasks | A five-hour period on Plus and Business; possible weekly cap | Credits where the plan allows | /status, usage page |
| Cursor | Included usage pool | Weekly or monthly, depending on plan type | Prepaid credit or on-demand usage | Cursor dashboard |
| GitHub Copilot | Monthly AI credits spent by chat, agent and CLI work | Midnight UTC on the 1st | Pay for more or upgrade | Billing settings, IDE icon |
Numbers are left out because providers revise them often. Check each pricing page for your plan.
What the table means in practice
Claude Code suits steady daily work. The two windows count at the same time, so pacing matters more than any single session.
Codex ties usage to model choice and task size. OpenAI notes that Pro currently skips the five-hour cap, which changes the planning for long sessions.
Cursor depends on your plan type. The newer subscription refreshes a weekly pool; legacy plans reset with the monthly billing cycle and bill extra usage at API rates.
GitHub Copilot is the most calendar-like. Credits reset on the first of the month in UTC and do not roll over, while code completions on paid plans are not billed in credits at all.
Running two or more assistants
Many developers mix tools: one for agent runs, another for completions in the editor. Then the comparison stops being academic, because you need to know which tool still has room right now. Each one answers that only for itself, in its own command or dashboard.
UsageAtlas: one view across assistants
UsageAtlas is the pick for keeping a mixed setup in check. It pulls the reported limits from all four assistants above and from other coding tools such as Warp and Amp, then shows remaining capacity and the next reset for each window. You set a threshold per window and get one desktop alert per reset cycle. Daily and historical views add tokens, models and estimated cost where the source supplies them.
The app costs nothing, its MIT-licensed code is public, it has builds for Windows, macOS and Linux, and your prompts and responses stay unread. Provider figures can lag and costs are estimates, so the provider's own page remains the billing record. If you only ever use one assistant, its built-in command covers most of what you need.
FAQ
Which AI coding assistant has the most generous limits? It depends on your plan and how you work, and providers change sizes often. Compare the current pricing pages against your own usage history.
Can I compare my actual usage across assistants? Yes, with a tracker that reads several tools. UsageAtlas shows supported limits, resets and usage history side by side.
Do I pay for UsageAtlas? No. The whole app is open source, with the code on GitHub.