SSyncDev

AI model comparison

Gemini 3.1 Pro Preview vs Gemini 3.5 Flash

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

Gemini 3.1 Pro Preview from Google lists 1.05M context, 65.54K maximum output, $2.00 input per 1M tokens, $12.00 output per 1M tokens. Gemini 3.5 Flash from Google lists 1.05M context, 65.54K maximum output, $1.50 input per 1M tokens, $9.00 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 3.1 Pro Preview

Gemini 3.1 Pro Preview from Google: Reasoning-first Gemini preview for agentic coding and complex problem solving.

Context
1.05M
Max output
65.54K
Input / 1M tokens
$2.00
Output / 1M tokens
$12.00

Accepts

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

Produces

  • Text output
Full model profilegithub.com ↗
VS

Google

Gemini 3.5 Flash

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

Context
1.05M
Max output
65.54K
Input / 1M tokens
$1.50
Output / 1M tokens
$9.00

Accepts

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

Produces

  • Text 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

  • Input price: $1.50
  • Output price: $9.00

Context capacity

Higher listed limit

Gemini 3.1 Pro Preview:1.05M

Gemini 3.5 Flash:1.05M

Same value

Maximum output

Higher listed limit

Gemini 3.1 Pro Preview:65.54K

Gemini 3.5 Flash:65.54K

Same value

Input price

Lower listed token rate

Gemini 3.1 Pro Preview:$2.00

Gemini 3.5 Flash:$1.50

Gemini 3.5 Flash

Output price

Lower listed token rate

Gemini 3.1 Pro Preview:$12.00

Gemini 3.5 Flash:$9.00

Gemini 3.5 Flash

Specifications

Pricing, limits and capabilities

Specifications for Gemini 3.1 Pro Preview and Gemini 3.5 Flash. Higher limits and lower prices describe these figures only.
SpecificationGemini 3.1 Pro PreviewGemini 3.5 Flash
ProviderGoogleGoogle
Listed pricing routeGoogleGoogle
Model familygemini-progemini-flash
Accepted inputstext, image, video, audio, pdftext, image, video, audio, pdf
Produced outputstexttext
Context window1.05M1.05M
Max output65.54K65.54K
Input price / 1M$2.00$1.50Lower
Output price / 1M$12.00$9.00Lower
Reasoning modeDocumentedDocumented
Tool callingDocumentedDocumented
Image inputDocumentedDocumented
Audio inputDocumentedDocumented
Structured outputDocumentedDocumented
LicenseProprietaryProprietary

Workload guidance

Which model should you choose?

Consider Gemini 3.5 Flash if you need 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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