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Claude Sonnet 5's new tokenizer increases costs 1.4x for English
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Notes (and a Pelican) on Claude Sonnet 5 - the new tokenizer makes it ~1.4x more expensive for English, ~1.33x more expensive for Spanish but roughly the same price for Simplified Mandarin https://simonwillison.net/2026/Jun/30/cl…
What’s new in Claude Sonnet 5
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