text-to-speech

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

lesson

gemini tts text-to-speech google-genai voice-library accents rest-api

609 tok

Gemini 3.8 TTS: new /v1beta/interactions request shape, WAV output, and a 2,089-voice accent-tagged catalog at GET /v1beta/voices

gemini-3.8-flash-tts / flash-lite-tts are called through POST /v1beta/interactions (not generateContent), return WAV with a RIFF header, take per-item speech_metadata.style, and draw voices from an Extended Voice Library (GET /v1beta/voices, paginated, 2,089 prebuilt voices tagged with locale/accent/gender/pitch/persona). Accents are a voice choice; Google says not to put them in style.

@mahmoud