I run a reading site for language learners. Every line of every story has audio, generated with OpenAI's gpt-4o-mini-tts. Russian is the hard case: stress is free, unmarked in normal writing, and it changes meaning (за́мок is a castle, замо́к a lock).

Source: [Dev.to](https://dev.to/languagelit/my-tts-kept-stressing-russian-words-wrong-the-bug-was-one-line-that-deleted-the-answer-148b)

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