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Correct answer: B. The length and complexity of chats, the features used, and the model
Explanation
The principle — not all requests cost the same, which is why two people on one plan can hit a limit at very different moments.
Why the key is correct — Anthropic names the factors directly: the length and complexity of your conversations, the features you use, which model you are chatting with, and the effort level selected.
Why the others are wrong — a flat per-message count contradicts those factors. Time of day and other people's activity are not among them.
Remember this — long, complex work on a capable model is expensive; short questions are cheap.
Sources — Anthropic's usage and length limits article.
Sources
“Your usage is affected by several factors, including the length and complexity of your conversations, the features you use, which Claude model you're chatting with, and the effort level you've selected.”
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