Gemini 3.8 Flash is now available. Try it out.

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.

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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	Audio generation Supported Caching Not supported Code execution Not supported File search Not supported Function calling Supported Grounding with Google Maps Not supported Image generation Not supported Live API Supported Search grounding Supported Structured outputs Not supported Thinking Supported (interleaved reasoning) URL context Not supported
Consumption options	Batch API Not supported
Versions	Read the model version patterns for more details. Stable: `gemini-3.8-live`
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. Omit thinking_level (or thinking_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 setting behavior: 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 or model). Setting turn_complete=true unconditionally interrupts active model generation. If you send content without turn_complete, the server waits for subsequent messages before responding.
Proactive audio: Proactive audio is now permanently enabled. Setting proactive_audio: false returns an error.
Affective dialogue: Affective dialogue is removed from the API. Remove any enable_affective_dialog configurations from your code.
Turn coverage: Defaults to TURN_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 table.