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Opus 4.7's New Tokenizer: What It Actually Costs — OpenRouter Blog

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Anthropic changed the tokenizer in Opus 4.7. We looked at usage that shifted from 4.6 to 4.7 to measure exactly how it affects costs.

Opus 4.7's New Tokenizer: What It Actually Costs Justin Summerville · 4/27/2026 We Used Our Own Tokenizer to Get a Comparable Baseline We Used Our Own Tokenizer to Get a Comparable Baseline Opus 4.7 Produces 32–45% More Native Tokens Caching Absorbs Most of the Token Inflation Completion Length in Opus 4.7 Diverges Based on the Prompt Size Actual Cost Impact Methodology Anthropic announced that Claude Opus 4.7 improves the model’s understanding of inputs with a new tokenizer. This means that while the model price hasn’t changed ($5/M input, $25/M output), the same inputs will cost more

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