Opus 4.7 Tokenizer Stealth Tax: Same $/Token Pricing, Up to 35% More Tokens Per Request

Finout·high signal

Opus 4.7 ships with a new tokenizer that produces 1.0–1.35x more tokens for the same input text, with code and structured data hitting the upper end. Despite nominally unchanged pricing ($5/$25 per million tokens), effective per-request costs rise 0–35% on identical prompts. Builders should benchmark actual token counts against Opus 4.6 baselines before migrating production workloads.