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Gemini 3.8 Live Extended Thinking logo

Gemini 3.8 Live Extended Thinking

Google · Sorti sept. 2026

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Recommandé

Gemini 3.8 Live Extended Thinking is the voice-agent model to start with: it tops Artificial Analysis' Speech to Speech Index and reasons and calls tools in the background while it keeps talking, at the same rate as the default Gemini 3.8 Live. The caveat is the Live API surface: no structured outputs, caching, code execution or batch. Right for teams building real-time voice agents that must solve multi-step problems mid-call.

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Recommandé pour

  • Real-time voice agents that must reason through multi-step problems mid-conversation
  • Calling tools and APIs in the background while the conversation continues
  • Multilingual voice: Google says it detects and switches between 97 languages mid-conversation

Déconseillé pour

  • Workloads that need structured outputs, context caching, code execution or the Batch API, none of which the model supports
  • Inputs above 131,072 tokens
  • Sensitive data on the free tier, which Google's pricing page marks as used to improve its products

Performances par tâche

Real-time voice agents

Excellent

Top Artificial Analysis Speech to Speech Index score (82.6) with background reasoning

Agentic tool use during calls

Very Good

Async function calling while audio streams; vendor-reported 68.6% on τ-Voice

Structured data extraction

Poor

Structured outputs are not supported on this model

Tarifs

Entrée

$0.75 / 1M (text)

Sortie

$4.50 / 1M (text)

Contexte

131K in, 65K out; audio $3/$12 per 1M

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Tests de performance

TestScoreSource
Artificial Analysis Speech to Speech Index (High)82.6 Source
Big Bench Audio (vendor-reported)97.7% Source
τ-Voice (vendor-reported)68.6% Source
Sierra τ-Voice-banking (vendor-reported)35.1% Source

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