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AI model comparison

Gemini 3.5 Flash Lite vs GPT-Realtime-2.1

Compare pricing, context limits, supported inputs and deployment options to choose a model for your workflow.

Gemini 3.5 Flash Lite from Google lists 1.05M context, 65.54K maximum output, $0.30 input per 1M tokens, $2.50 output per 1M tokens. GPT-Realtime-2.1 from OpenAI lists 128K context, 32K maximum output, $4.00 input per 1M tokens, $24.00 output per 1M tokens. Compare the inputs, outputs and deployment options below to see which fits your workflow.

Side-by-sideCapabilities and practical differences

Google

Gemini 3.5 Flash Lite

Gemini 3.5 Flash Lite from Google: Fast Gemini model balancing multimodal reasoning, tool use, and cost.

Context
1.05M
Max output
65.54K
Input / 1M tokens
$0.30
Output / 1M tokens
$2.50

Accepts

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

Produces

  • Text output
Full model profilegithub.com ↗
VS

OpenAI

GPT-Realtime-2.1

GPT-Realtime-2.1 from OpenAI: Realtime speech-to-speech model with configurable reasoning, tool use, and robust voice-agent behavior.

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

Accepts

  • Text input
  • Audio input
  • Image input

Produces

  • Text output
  • Audio output
Full model profilegithub.com ↗

At a glance

Key differences

Compare the available figures below, then try both models on the work you need to do.

Gemini 3.5 Flash Lite

  • Context capacity: 1.05M
  • Maximum output: 65.54K
  • Input price: $0.30
  • Output price: $2.50

Context capacity

Higher listed limit

Gemini 3.5 Flash Lite:1.05M

GPT-Realtime-2.1:128K

Gemini 3.5 Flash Lite

Maximum output

Higher listed limit

Gemini 3.5 Flash Lite:65.54K

GPT-Realtime-2.1:32K

Gemini 3.5 Flash Lite

Input price

Lower listed token rate

Gemini 3.5 Flash Lite:$0.30

GPT-Realtime-2.1:$4.00

Gemini 3.5 Flash Lite

Output price

Lower listed token rate

Gemini 3.5 Flash Lite:$2.50

GPT-Realtime-2.1:$24.00

Gemini 3.5 Flash Lite

Specifications

Pricing, limits and capabilities

Specifications for Gemini 3.5 Flash Lite and GPT-Realtime-2.1. Higher limits and lower prices describe these figures only.
SpecificationGemini 3.5 Flash LiteGPT-Realtime-2.1
ProviderGoogleOpenAI
Listed pricing routeGoogleOpenAI
Model familygemini-flash-litegpt
Accepted inputstext, image, video, audio, pdftext, audio, image
Produced outputstexttext, audio
Context window1.05MHigher128K
Max output65.54KHigher32K
Input price / 1M$0.30Lower$4.00
Output price / 1M$2.50Lower$24.00
Reasoning modeDocumentedDocumented
Tool callingDocumentedDocumented
Image inputDocumentedDocumented
Audio inputDocumentedDocumented
Structured outputDocumentedNot documented
LicenseProprietaryProprietary

Workload guidance

Which model should you choose?

Consider Gemini 3.5 Flash Lite if you need larger context or larger maximum output or a lower listed input rate or a lower listed output rate. Test both on the same representative examples and judge the output against your acceptance criteria. Include tool failures, retries and the time to a completed task.

Documentation and model profiles

Explore each model’s features, API requirements and licence terms in the sources below.

Questions people ask

It brings together documented inputs and outputs, token limits, deployment terms and available pricing. When both models have source-linked, verified results on a shared benchmark, those results are shown with their individual sources. The comparison is a starting point for evaluating your own workload.

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