Claude has several usage limits — a 5-hour session, a weekly all-models pool, and per-model caps. Here's a free, open-source browser extension that shows them all in your toolbar.
Claude Usage Monitor is an open-source extension showing real-time limits: 5-hour sessions, weekly pool, per-model caps (Opus/Sonnet/Claude Design). For IT teams using Claude at scale, it prevents quota surprises and enables workflow planning within weekly budget constraints by model.
If you use Claude daily, you've probably hit a wall mid-task. The reason it's so easy: Claude doesn't have one limit. It has several.
A rolling 5-hour session window
A weekly pool shared by all models
Separate weekly caps per model (Opus, Sonnet, Claude Design)
And the weekly pool is sneaky: Fable has no cap of its own and draws that shared pool down ~2× faster than Opus. So you can burn the week without realizing it.
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