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AI model comparison

Gemini Omni Flash Preview vs Grok 4.5

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

Gemini Omni Flash Preview from Google lists 1.05M context, 57.92K maximum output, $1.50 input per 1M tokens, $17.50 output per 1M tokens. Grok 4.5 from xAI lists 500K context, 500K maximum output, $2.00 input per 1M tokens, $6.00 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 Omni Flash Preview

Gemini Omni Flash Preview from Google: Video generation and editing model for fast, conversational text- and image-to-video workflows.

Context
1.05M
Max output
57.92K
Input / 1M tokens
$1.50
Output / 1M tokens
$17.50

Accepts

  • Text input
  • Image input
  • Video input

Produces

  • Video output
Full model profilegithub.com ↗
VS

xAI

Grok 4.5

Grok 4.5 from xAI: xAI's Grok model for chat, coding, agentic tools, and lower hallucination risk.

Context
500K
Max output
500K
Input / 1M tokens
$2.00
Output / 1M tokens
$6.00

Accepts

  • Text input
  • Image 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 Omni Flash Preview

  • Context capacity: 1.05M
  • Input price: $1.50

Grok 4.5

  • Maximum output: 500K
  • Output price: $6.00

Context capacity

Higher listed limit

Gemini Omni Flash Preview:1.05M

Grok 4.5:500K

Gemini Omni Flash Preview

Maximum output

Higher listed limit

Gemini Omni Flash Preview:57.92K

Grok 4.5:500K

Grok 4.5

Input price

Lower listed token rate

Gemini Omni Flash Preview:$1.50

Grok 4.5:$2.00

Gemini Omni Flash Preview

Output price

Lower listed token rate

Gemini Omni Flash Preview:$17.50

Grok 4.5:$6.00

Grok 4.5

Specifications

Pricing, limits and capabilities

Specifications for Gemini Omni Flash Preview and Grok 4.5. Higher limits and lower prices describe these figures only.
SpecificationGemini Omni Flash PreviewGrok 4.5
ProviderGooglexAI
Listed pricing routeGooglexAI
Model familygeminigrok
Accepted inputstext, image, videotext, image
Produced outputsvideotext
Context window1.05MHigher500K
Max output57.92K500KHigher
Input price / 1M$1.50Lower$2.00
Output price / 1M$17.50$6.00Lower
Reasoning modeDocumentedDocumented
Tool callingNot documentedDocumented
Image inputDocumentedDocumented
Audio inputNot documentedNot documented
Structured outputNot documentedDocumented
LicenseProprietaryProprietary

Workload guidance

Which model should you choose?

Consider Gemini Omni Flash Preview if you need larger context or a lower listed input rate. Consider Grok 4.5 if you need larger maximum output 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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