📝 Blog 2d ago
Claude Opus 4.7 tokenizer inflation: 35% cost increase hits API users
Claude Opus 4.7's new tokenizer inflates token counts 35-45% for identical inputs (especially code-heavy prompts), causing silent production cost increases despite unchanged "$5/$25 per million tokens" pricing—a $500/day app became $675/day overnight. The incident sparked migration discussions to self-hosted open models like GLM-5 and Qwen3.5 where infrastructure costs are flat regardless of tokenization.