Gemini 3.1 Flash TTS Adds Granular Audio Tags for Precise Speech Control

The source states that Gemini 3.1 Flash TTS is the next generation of expressive AI speech. It introduces granular audio tags that give precise control to direct AI speech for expressive audio generation. The model is now available across Google products. That is the core of the announcement: a new text-to-speech model with a specific new feature—granular audio tags—and immediate availability in Google's ecosystem.

What does this mean in practice? The key new capability is the granular audio tags. According to the source, these tags allow you to direct AI speech with precision. This suggests that instead of just typing text and getting a generic voice, you can insert tags to control aspects of the delivery. The source does not specify what the tags look like or what parameters they control, but the emphasis on 'granular' and 'precise control' implies a level of fine-tuning not previously available. For people using AI for everyday work, this could mean more natural-sounding voiceovers, more expressive narration, or the ability to match a specific tone without manual editing.

Our interpretation is that this is a move toward making text-to-speech more controllable and less of a black box. The practical upshot is that you can potentially get the exact delivery you want in one pass, rather than generating multiple takes and hoping. However, the source provides no examples, no list of tags, and no comparison to previous models. So while the capability sounds promising, the details are thin. We cannot yet say how much control you actually get or how easy it is to use. The fact that it is available across Google products suggests it is being positioned for broad use, not just as a developer API.