Tip: Opus 4.7's Tokenizer Burns 12–18% More Tokens on English but Saves 20–35% on Non-Latin Scripts

r/ClaudeAI·medium signal

A r/ClaudeAI post (89 upvotes) flagged that Opus 4.7 is 'English only' in practice — using German prompts burned significantly more tokens than expected, with graphs rendering in English despite German input. Independent analysis confirms the new tokenizer runs 12–18% longer on typical English text (up to 1.35x on code and structured data) while reducing non-Latin script token counts by 20–35%. Builders running multilingual workloads should benchmark token usage before and after upgrading to avoid cost surprises.