SSyncDev

AI model comparison

Gemini 3.1 Flash Live Preview vs GPT-Realtime-2.1

Compare recorded price, context, output limits, speed, latency, capabilities, and input/output support. Every missing value stays visible, and unsourced benchmarks are excluded.

Gemini 3.1 Flash Live Preview and GPT-Realtime-2.1 both come up when teams are choosing a model for production work, and the honest answer usually depends on your workload rather than a leaderboard. This page puts their published specifications side by side — context window, token pricing, supported inputs and outputs — so you can see where they actually differ.

Side-by-sideReviewed by our team

Google

Gemini 3.1 Flash Live Preview

High-quality, low-latency Live API model for real-time dialogue and voice-first AI applications

Context
131.1K
Max output
65.5K
Input / 1M
$0.75
Output / 1M
$4.50
Output speed
—

Accepts

  • Text input
  • Image input
  • Video input
  • Audio input

Produces

  • Text output
  • Audio output
Full model profileVendor docs ↗
VS

OpenAI

GPT-Realtime-2.1

Realtime speech-to-speech model with configurable reasoning, tool use, and robust voice-agent behavior

Context
128K
Max output
32K
Input / 1M
$4.00
Output / 1M
$24.00
Output speed
—

Accepts

  • Text input
  • Audio input
  • Image input

Produces

  • Text output
  • Audio output
Full model profileVendor docs ↗

At a glance

Decision snapshot

This is a directional summary of the values recorded in this directory—not a universal quality verdict. Test the finalists on your own prompts before committing.

Where Gemini 3.1 Flash Live Preview leads in recorded data

  • Context capacity: 131.1K
  • Maximum output: 65.5K
  • Input price: $0.75
  • Output price: $4.50

Where GPT-Realtime-2.1 leads in recorded data

No complete recorded factor currently favors this model. That does not establish lower real-world quality.

Context capacity

Higher listed limit

Gemini 3.1 Flash Live Preview:131.1K

GPT-Realtime-2.1:128K

Gemini 3.1 Flash Live Preview

Maximum output

Higher listed limit

Gemini 3.1 Flash Live Preview:65.5K

GPT-Realtime-2.1:32K

Gemini 3.1 Flash Live Preview

Input price

Lower recorded price

Gemini 3.1 Flash Live Preview:$0.75

GPT-Realtime-2.1:$4.00

Gemini 3.1 Flash Live Preview

Output price

Lower recorded price

Gemini 3.1 Flash Live Preview:$4.50

GPT-Realtime-2.1:$24.00

Gemini 3.1 Flash Live Preview

Output speed

Higher recorded throughput

Gemini 3.1 Flash Live Preview:—

GPT-Realtime-2.1:—

No complete comparison

Time to first token

Lower recorded latency

Gemini 3.1 Flash Live Preview:—

GPT-Realtime-2.1:—

No complete comparison

Intelligence Index

Higher directory index

Gemini 3.1 Flash Live Preview:—

GPT-Realtime-2.1:—

No complete comparison

Evidence

Verified shared benchmarks

A score appears only when both records include a verified source. It is not treated as a universal ranking.

These two models haven't been measured on the same benchmark yet, so there's nothing meaningful to chart. Comparing scores from different tests would tell you more about the tests than the models — the specs and pricing above are the better guide here.

Specifications

Pricing, limits and capabilities

SpecificationGemini 3.1 Flash Live PreviewGPT-Realtime-2.1
ProviderGoogleOpenAI
Model familygemini-flashgpt
Accepted inputstext, image, video, audiotext, audio, image
Produced outputstext, audiotext, audio
Context window131.1KRecorded lead128K
Max output65.5KRecorded lead32K
Intelligence Index——
Input price / 1M$0.75Recorded lead$4.00
Output price / 1M$4.50Recorded lead$24.00
Output speed——
Time to first token——
Reasoning modeDocumentedDocumented
Tool callingDocumentedDocumented
Image inputDocumentedDocumented
Audio inputDocumentedDocumented
Structured outputNot documentedNot documented
LicenseProprietaryProprietary
ReleasedMar 26, 2026Jul 6, 2026

Workload guidance

Which model should you choose?

On the published numbers, Gemini 3.1 Flash Live Preview accepts the larger context window and Gemini 3.1 Flash Live Preview is cheaper per input token. Which matters more depends on whether your bottleneck is document size or spend — the table above has the exact figures.

Provenance

Sources and data limits

Prices and hosted performance can change. SyncDev records source references and clearly separates documented specifications from measured values; confirm commercial terms with the provider before deployment.

Questions people ask

It compares recorded context and output limits, token prices, output speed, time to first token, Intelligence Index, modality support, tool and structured-output capabilities, release information, and only source-linked benchmarks verified on both records. Missing information is labeled rather than inferred.

Compare a different pair

Choose any two approved model records and review them with the same evidence rules.

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