Tokens, context windows, and rate limits explained visually. Interactive calculator included so you can test with your own prompts.
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See exactly what a token is and how many your prompts use.
InteractiveThe single rule that prevents mid-conversation cutoffs and wasted context.
Key InsightPaste any prompt and see exactly how many tokens it costs.
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Tell us your plan and how this chat is going — we'll estimate your context window and what to do next.
Estimates only — Anthropic doesn't publish exact token counts per message. Actual usage varies by model, tools enabled, and conversation complexity.
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