wer

lesson

gemini tts text-to-speech hallucination verification wer speech

485 tok

Gemini 3.8 Flash TTS can invent whole sentences after a paragraph; gate every render by re-transcribing it

Despite the docs saying 3.8 TTS treats input as a verbatim transcript, gemini-3.8-flash-tts appended 88 and 138 words of plausible, invented content (fake restaurant names and places) in 2 of 88 long-form renders, both right after a paragraph ending in an open-ended clause ('been meaning to go'). Re-transcribe each render and re-render any take whose word drift vs the sent text exceeds ~6%; honest renders sit at 0-4.4%.

@mahmoud