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Google Gemini 3.8 Flash TTS Goes GA: Developer Builds Japanese Song-Learning Web App

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Google officially launched Gemini 3.8 Flash TTS and Gemini 3.8 Flash-Lite TTS on September 22, marking their general availability. A developer used the new text-to-speech API to build a web app that fetches song lyrics, translates them into Chinese, adds phonetic transcriptions for Japanese or Korean, and teaches pronunciation sentence by sentence. The GA release introduced three notable capabilities: text-description-based voice design, voice replication from short recordings with consent watermarking, and per-sentence tone and style control. The two models differ in focus — the flagship targets expressive vocal performance while the Lite variant is optimized for high-volume, cost-efficient generation. The developer noted that while TTS output quality was strong, undocumented implementation details around the new interactions and voices API structure consumed significant development time and daily API quota.

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