Gemini 3.1 Flash TTS
Google Gemini 3.1 Flash 语音合成模型，自然度高、多音色可选，适合配音、语音助手与内容朗读场景。
- Vendor: Google
- Context window: - tokens
- Official list price: input $1 / output $20 per 1M tokens
- Access: OpenAI-compatible API via HefuAI Platform (one key for all models)