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Model comparison

GPT-5.2 Pro vs Gemini 3 Deep Think

OpenAIGPT-5.2 Pro
Input
$1.75 / 1M tokens
Output
$14 / 1M tokens
Context
400K
Released
2025-12-11
Full model page →GoogleGemini 3 Deep Think
Input
Included with Google AI Ultra
Output
Included with Google AI Ultra
Context
1M
Released
2025-12-03
Full model page →
Short answer

Gemini 3 Deep Think scores higher on 2 of the 3 benchmarks both models report (the other leads on 1); Gemini 3 Deep Think has the larger context window (1M vs 400K).

Specs and pricing side by side

SpecGPT-5.2 ProGemini 3 Deep Think
MakerOpenAIGoogle
Released2025-12-112025-12-03
Context window400K1M
Max output128K64K tokens
Input price$1.75 / 1M tokensIncluded with Google AI Ultra
Output price$14 / 1M tokensIncluded with Google AI Ultra
ParametersNot disclosedUndisclosed (sparse mixture-of-experts)
LicenseProprietaryProprietarysame
WeightsAPI onlyAPI onlysame
ModalitiesText, VisionText, Vision, Audio, Video
Knowledge cutoffAugust 31, 2025January 2025

Benchmarks both models report

BenchmarkGPT-5.2 ProGemini 3 Deep Think
ARC-AGI-254.2%45.1%
GPQA Diamond93.2%93.8%
Humanity's Last Exam36.6%41%

Scores are as published by each maker or its cited source; harness, reasoning effort and date can differ between rows, so treat small gaps as ties. Sources are listed on each model page.

Which one should you pick?

Pick GPT-5.2 Pro if…

  • You care about ARC-AGI-2 (it scores higher on 1 shared benchmark).
  • Your use case is: research-grade questions where a slower, higher-quality answer is worth the wait.

Pick Gemini 3 Deep Think if…

  • You care about GPQA Diamond, Humanity's Last Exam (it scores higher on 2 shared benchmarks).
  • You need the longer context (1M vs 400K).
  • You need Audio / Video input, which GPT-5.2 Pro lacks.
  • Your use case is: tackling competition-grade and research-level mathematics and proofs.

FAQ

Which is better, GPT-5.2 Pro or Gemini 3 Deep Think?

Gemini 3 Deep Think scores higher on 2 of the 3 benchmarks both models report (the other leads on 1); Gemini 3 Deep Think has the larger context window (1M vs 400K). The better pick depends on whether you value benchmark scores, price per token, context length or openness for your workload.

What are the context windows of GPT-5.2 Pro and Gemini 3 Deep Think?

GPT-5.2 Pro offers 400K with up to 128K output; Gemini 3 Deep Think offers 1M with up to 64K tokens output.

Is GPT-5.2 Pro newer than Gemini 3 Deep Think?

GPT-5.2 Pro was released 2025-12-11; Gemini 3 Deep Think was released 2025-12-03.

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