Claude Token Counter

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First seen: Apr 20, 2026Last active: 4h ago

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Product LaunchApr 20, 2026
Simon Willison updated his Claude Token Counter tool to measure real costs before upgrading to Opus 4.7
purpose:
cost comparison between Opus 4.6 and 4.7

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Opus 4.7's Tokenizer Change: How to Measure Your Real Claude Code Costs
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Claude Opus 4.7's updated tokenizer means the same input can cost 40%+ more than 4.6. Use the Claude Token Counter to measure real costs before upgrad
20h ago90 relevance

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