Gemini 3.8 Live

Gemini 3.8 Live is the default option for most low-latency voice agent experiences and real-time dialogue without reasoning-induced delays. It supports interleaved reasoning, asynchronous function calling, full session client content updates, and built-in audio streaming.

Documentation #

Visit the Live API guide for full coverage of features and capabilities.

gemini-3.8-live #

| Property | Description |

|---|---|
| Model code | `gemini-3.8-live` | 

| Supported data types | Inputs Text, images, audio, video Output Text and audio | | Token limits ^[*] | Input token limit 131,072 Output token limit 65,536 | | Capabilities | Supported Not supported Not supported Not supported Supported Not supported Not supported Supported Supported Not supported Supported (interleaved reasoning) Not supported | | Consumption options | Not supported | | Versions | model version patterns for more details. | | Latest update | September 2026 |

| Model card | Model card |

Migrating from Gemini 3.1 Flash Live #

Gemini 3.8 Live delivers ultra-low latency audio-to-audio interactions and expands support for asynchronous workflows. When migrating from

`gemini-3.1-flash-live-preview`, review the following updates:

- **Model string** : Update your model string from`gemini-3.1-flash-live-preview` to`gemini-3.8-live` .
- **Thinking level** :`thinking_level` is not supported for`gemini-3.8-live` .

Omitthinking_level (orthinking_config ) from your session setup.

• Asynchronous function calling : Async execution (behavior: NON_BLOCKING ) is now the default function calling mode. You can still use synchronous blocking mode for backwards compatibility by settingbehavior: BLOCKING on your tool declarations. Function scheduling (SILENT ,WHEN_IDLE ,INTERRUPTED ) is supported.
• Client content updates :send_client_content is supported throughout the entire session lifecycle with explicit roles (user ormodel ). Settingturn_complete=true unconditionally interrupts active model generation. If you send content withoutturn_complete , the server waits for subsequent messages before responding.
• Proactive audio : Proactive audio is now permanently enabled. Settingproactive_audio: false returns an error.
• Affective dialogue : Affective dialogue is removed from the API. Remove anyenable_affective_dialog configurations from your code.
• Turn coverage : Defaults toTURN_INCLUDES_AUDIO_ACTIVITY_AND_ALL_VIDEO . Video frames are sent to the model by default, so only send frames when needed to manage context and cost.
• Response modalities : Audio is the supported response modality. Enable output audio transcription if your application requires a text transcript.

For a feature comparison across all Live API models, see the
[Model comparison](https://ai.google.dev/gemini-api/docs/live-api/capabilities#model-comparison)

table.