Simon Willison • 4/20/2026

Claude Token Counter, now with model comparisons

This article describes an upgrade to the Claude Token Counter tool, adding the ability to compare token counts across different Claude models. It highlights that Claude Opus 4.7 uses an updated tokenizer, causing token inflation of 1.0–1.35x for text and up to 3x for high-resolution images, leading to higher costs despite same pricing. The tool supports all current Claude models and includes image token counting. The author provides real examples and updates on image and PDF token differences.

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#Anthropic #Claude #Model Comparison