{"schema":"postcutoff/model@1","as_of":"2026-11-13T13:49:00+01:00","url":"https://postcutoff.com/m/gemini-3-8-flash-tts/","md":"https://postcutoff.com/m/gemini-3-8-flash-tts/index.md","disclosure":{"written_by":"AI agents (Claude Opus 5.5 in Claude Code)","editor":"human editor","policy":"https://postcutoff.com/about/"},"license":null,"id":"gemini-3-8-flash-tts","name":"Gemini 3.8 Flash TTS","org":"Google DeepMind","family":"Gemini 3","released":"2026-09-22","status":"current","type":"audio/speech","modality_in":["text"],"modality_out":["audio"],"open_weights":false,"model_license":"proprietary","context_window":8192,"max_output":16384,"knowledge_cutoff":null,"pricing":{"input":0.5,"output":9,"unit":"per 1M tokens (text in / audio out; introductory through 2026-12-31, $1.00 / $18.00 from 2027-01-01)","source":"https://ai.google.dev/gemini-api/docs/pricing"},"price_line":"$0.50 in, $9 out per 1M tokens","access":[{"provider":"Gemini API","model_id":"gemini-3.8-flash-tts","endpoint":"https://generativelanguage.googleapis.com/v1beta/models/gemini-3.8-flash-tts:generateContent","docs":"https://ai.google.dev/gemini-api/docs/models/gemini-3.8-flash-tts"},{"provider":"Gemini API","model_id":"gemini-3.8-flash-lite-tts","docs":"https://ai.google.dev/gemini-api/docs/models/gemini-3.8-flash-lite-tts"}],"capabilities":[{"name":"Voice design from prompts","detail":"Create entirely new voices from natural-language descriptions; #1 on Hume AI Voice Design Benchmark.","first":false,"discovered":"launch","source":"https://blog.google/innovation-and-ai/models-and-research/gemini-models/gemini-3-8-text-to-speech/"},{"name":"#1 on Hume Real-World VoiceEQ leaderboard","detail":"Hume's blind human-rated benchmark (2026-09-24): Gemini 3.8 Flash TTS 0.920 and Flash-Lite TTS 0.914 expressivity-reliability score, ahead of Gemini 2.5 Pro TTS (0.880) and Cartesia Sonic 3.6 (0.840); long-form stability up from 1.22 to ~2.9-3.0/5, but weaker speaker similarity (3.68/5).","first":false,"discovered":"later","source":"https://www.hume.ai/blog/newly-released-google-s-gemini-3-8-flash-tts-tops-hume-s-real-world-voiceeq-leaderboard"},{"name":"Voice replication","detail":"Recreates a consistent voice from a ~30-second sample with consent verification; 2,000+ library voices.","first":false,"discovered":"launch","source":"https://blog.google/innovation-and-ai/models-and-research/gemini-models/gemini-3-8-text-to-speech/"},{"name":"Directed long-form multi-speaker audio","detail":"Line-by-line direction of pacing/emotion, dual-speaker staging, stable over hours; 130+ languages with auto-detection.","first":false,"discovered":"launch","source":"https://ai.google.dev/gemini-api/docs/models/gemini-3.8-flash-tts"}],"entry":null,"notes":"Sibling gemini-3.8-flash-lite-tts (101 languages) costs $0.50 in / $6.00 audio out (intro); own file gemini-3-8-flash-lite-tts. Outputs SynthID-watermarked. Older: gemini-3.1-flash-tts-preview, gemini-2.5-flash-preview-tts, gemini-2.5-pro-preview-tts.","verified":"2026-09-29","body_md":"Studio-grade, steerable text-to-speech (audiobooks, games, dubbing, voice agents).\n\n```bash\ncurl \"https://generativelanguage.googleapis.com/v1beta/models/gemini-3.8-flash-tts:generateContent\" \\\n  -H \"x-goog-api-key: $GEMINI_API_KEY\" -H \"Content-Type: application/json\" \\\n  -d '{\"contents\":[{\"parts\":[{\"text\":\"Say cheerfully: Have a wonderful day!\"}]}],\n       \"generationConfig\":{\"responseModalities\":[\"AUDIO\"]}}'\n```\n\nSources: [model page](https://ai.google.dev/gemini-api/docs/models/gemini-3.8-flash-tts), [pricing](https://ai.google.dev/gemini-api/docs/pricing), [launch blog](https://blog.google/innovation-and-ai/models-and-research/gemini-models/gemini-3-8-text-to-speech/).","page_url":"https://postcutoff.com/m/gemini-3-8-flash-tts/","standing":{"kind":"speech and audio","newer_count":19,"newer":[{"id":"nemotron-3-5-transcribe","name":"NVIDIA Nemotron 3.5 Transcribe (30B-A4B)","org":"NVIDIA","released":"2026-10-28","page_url":"https://postcutoff.com/m/nemotron-3-5-transcribe/"},{"id":"hy-simulmt-30b-a3b","name":"Hy-SimulMT-30B-A3B","org":"Tencent","released":"2026-10-22","page_url":"https://postcutoff.com/m/hy-simulmt-30b-a3b/"},{"id":"eleven-realtime-v1-max","name":"Eleven Realtime v1 Max / Mini","org":"ElevenLabs","released":"2026-10-20","page_url":"https://postcutoff.com/m/eleven-realtime-v1-max/"},{"id":"voxtral-mini-transcribe-3","name":"Voxtral Mini Transcribe 3 (+ Mini Transcribe Realtime 3)","org":"Mistral AI","released":"2026-10-20","page_url":"https://postcutoff.com/m/voxtral-mini-transcribe-3/"},{"id":"voxtral-small-transcribe-3","name":"Voxtral Small Transcribe 3","org":"Mistral AI","released":"2026-10-20","page_url":"https://postcutoff.com/m/voxtral-small-transcribe-3/"}],"before":{"id":"gemini-3-8-live","name":"Gemini 3.8 Live","org":"Google DeepMind","released":"2026-09-15","page_url":"https://postcutoff.com/m/gemini-3-8-live/"},"after":null,"weights":"closed","licence":"proprietary","licence_permissive":false,"summary":"Closed weights; access is hosted only."}}