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Anthropic's new Opus 4.7 tokenizer inflates costs by up to 47% despite maintaining the same per-token pricing as its predecessor.
THE DECODER · April 19, 2026
AI Summary
- •Opus 4.7 uses a new tokenizer that converts the same text into up to 47% more tokens than Opus 4.6
- •While per-token pricing remains flat between the two models, actual request costs are significantly higher due to increased token consumption
- •Claude Code users are seeing measurable cost increases in practice from this tokenizer change
- •The price increase effectively contradicts Anthropic's stated flat pricing structure between model generations
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