Opus 4.7's New Tokenizer: What It Actually Costs

Anthropic's introduction of a new tokenizer in Claude Opus 4.7 has led to an increase in the number of native tokens produced, resulting in a 12-27% rise in costs for prompts over 2K tokens, although short prompts saw improved cost efficiency due to significantly shorter completions. The tokenizer inflation, which causes Opus 4.7 to generate 32-45% more native tokens than Opus 4.6, is somewhat mitigated by prompt caching, which absorbs a substantial portion of the additional token cost. The study, based on OpenRouter's request logs, compared the usage of Opus 4.6 and 4.7 within a specific user cohort, revealing that the increased native token count from the new tokenizer, combined with completion length changes and cache absorption, contributed differently to cost impacts across various prompt sizes.

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