How We Built a Self-Correcting Localization System for OpenRouter

OpenRouter launched beta localization into Simplified Chinese, Spanish, Brazilian Portuguese, German, French, Japanese, and Korean, using a daily pipeline that detects changed English strings, translates them with GPT-6.1 Sol, runs code checks, and has a second model verify meaning against the English, retrying with objections attached. Translations are committed as JSON catalogs in Git with fingerprints of their English source, and reader reports become glossary rules, style notes, overrides, or eval cases. A full retranslation of 16,918 strings into 7 languages costs about $460, versus about $7,200 at Smartling's published machine translation rate.