OpenAI won't let you "escape" freely in JSON mode

Skip to content ### Authors * Weixuan Xiao ### Published June 23, 2026 ## TL;DR Accented characters like é may be escaped in JSON as \u00e9. We found that OpenAI’s and Azure OpenAI’s endpoints can’t emit these correctly in JSON mode: after the prefix \u00, the decoder allows only contr…

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