In March 2026, Claude Max subscribers started watching a 5-hour window drain in 90 minutes. One person reported going from 21% used to 100% used on a single prompt, and everybody assumed it was a bug.
It wasn't. Anthropic's Thariq Shihipar posted on X and said that they're adjusting the 5 hour session limits during peak hours to manage growing demand, affecting roughly 7% of users.
Claude Pro meters you on two clocks at once: a rolling 5-hour session window and a weekly cap, shared across claude.ai, Claude Code and the desktop app. Neither one is a message counter. Both are token meters, and what drains them fastest is not how much you ask, it is how much you make Claude re-read.
That distinction is the whole post. Once you read the meter properly, most of the "limits" problem turns into a context management problem, and context is something you actually control.
What are Claude Pro's usage limits, exactly?
