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Model comparison

Gemini 3 Pro vs GPT-5.2

Data verified

Head-to-head evidence from 21 shared benchmark results across 7 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.

67.73/100
Margin
9.3pts
← winning
GPT-5.2
OpenAI
58.43/100
1 category wins2 category wins

Public leaderboard positions: Gemini 3 Pro #19 (Supported); GPT-5.2 #64 (Estimated). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.

Evidence parity. Gemini 3 Pro and GPT-5.2 share 21 comparable benchmark results. 3 of 8 categories are comparable. 6 results are unique to Gemini 3 Pro; 7 to GPT-5.2.

Updated July 20, 2026
Shared results
21
Gemini 3 Pro only
6
GPT-5.2 only
7
Comparable categories
3 / 8

Pick Gemini 3 Pro if you want the stronger benchmark profile. GPT-5.2 only becomes the better choice if reasoning is the priority or you want the stronger reasoning-first profile.

Confidence note. This is a partial-evidence comparison with 21 shared benchmark results across 7 evidence categories; 3 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.

Why this result

Gemini 3 Pro is clearly ahead on the BenchAlign aggregate, 67.73 to 58.43. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.

Gemini 3 Pro's sharpest advantage is in multimodal & grounded, where it averages 81.1 against 80.4. The single biggest benchmark swing on the page is ARC-AGI-2, 31.1% to 52.9%. GPT-5.2 does hit back in reasoning, so the answer changes if that is the part of the workload you care about most.

GPT-5.2 is also the more expensive model on tokens at $1.75 input / $14.00 output per 1M tokens, versus $2.00 input / $12.00 output per 1M tokens for Gemini 3 Pro. GPT-5.2 is the reasoning model in the pair, while Gemini 3 Pro is not. That usually helps on harder chain-of-thought-heavy tests, but it can also mean more latency and more token spend in real use. Gemini 3 Pro gives you the larger context window at 2M, compared with 400K for GPT-5.2.

Category breakdown

Exact category averages are shown below. Not measured means BenchLM does not have enough sourced public coverage for that model and category.

Category scores and score margins for Gemini 3 Pro and GPT-5.2
CategoryGemini 3 ProΔGPT-5.2
ReasoningGemini 3 Pro31.1Margin→ 21.8GPT-5.252.9
MathGemini 3 Pro32.9Margin→ 2.3GPT-5.235.2
MultimodalGemini 3 Pro81.1Margin← 0.7GPT-5.280.4
AgenticGemini 3 ProNot measuredMarginNo overlapGPT-5.255.7
CodingGemini 3 ProNot measuredMarginNo overlapGPT-5.270.6
KnowledgeGemini 3 ProNot measuredMarginNo overlapGPT-5.292.4

Decisive benchmark drivers

The largest measured benchmark gaps in this matchup, with exact reported values.

More
A · Gemini 3 ProB · GPT-5.2

  1. ARC-AGI-2

    Reasoning
    Source ↗
    A 31.1%B 52.9%
    Winner: GPT-5.2Δ 21.8
    ARC-AGI-2: Gemini 3 Pro scored 31.1%; GPT-5.2 scored 52.9%. GPT-5.2 wins this benchmark.

  2. FrontierMath v2 (Tiers 1-3)

    Math
    Source ↗
    A 37.600%B 40.700%
    Winner: GPT-5.2Δ 3.1
    FrontierMath v2 (Tiers 1-3): Gemini 3 Pro scored 37.600%; GPT-5.2 scored 40.700%. GPT-5.2 wins this benchmark.

  3. MMMU-Pro

    Multimodal
    Source ↗
    A 81%B 79.5%
    Winner: Gemini 3 ProΔ 1.5
    MMMU-Pro: Gemini 3 Pro scored 81%; GPT-5.2 scored 79.5%. Gemini 3 Pro wins this benchmark.

  4. CharXiv

    Multimodal
    Source ↗
    A 81.4%B 82.1%
    Winner: GPT-5.2Δ 0.7
    CharXiv: Gemini 3 Pro scored 81.4%; GPT-5.2 scored 82.1%. GPT-5.2 wins this benchmark.

  5. FrontierMath v2 (Tier 4)

    Math
    Source ↗
    A 18.750%B 18.800%
    Winner: GPT-5.2Δ 0.1
    FrontierMath v2 (Tier 4): Gemini 3 Pro scored 18.750%; GPT-5.2 scored 18.800%. GPT-5.2 wins this benchmark.

Operational comparison

Runtime and commercial metrics are compared only when both models have a complete sourced value.

MetricGemini 3 ProGPT-5.2Comparison
Input / output priceUSD per 1M tokensGemini 3 Pro$2 input / $12 outputGPT-5.2$1.75 input / $14 outputGemini 3 Pro has the lower combined listed price.
Generation speedtokens per secondGemini 3 Pro109 tok/sGPT-5.273 tok/sGemini 3 Pro has the higher measured throughput.
First-answer latencyseconds to first tokenGemini 3 Pro32.65 sGPT-5.2130.34 sGemini 3 Pro reaches the first token sooner.
Context windowmaximum listed tokensGemini 3 Pro2MGPT-5.2400KGemini 3 Pro lists the larger context window.

Benchmark Deep Dive

Agentic
BenchmarkGemini 3 ProGPT-5.2Result
τ²-bench resultsSource 87.1%84.8%Gemini 3 Pro leads
Gert LabsSource 63.23%46.54%Gemini 3 Pro leads
JobBenchSource 11.4%34.3%GPT-5.2 leads
BrowseCompSource —65.8%Not comparable
OSWorld-VerifiedSource —47.3%Not comparable
Coding
BenchmarkGemini 3 ProGPT-5.2Result
Vibe Code BenchSource 14.30%53.50%GPT-5.2 leads
AA-SciCodeSource 56.1%52.1%Gemini 3 Pro leads
AA LiveCodeBenchSource 91.7%—Not comparable
SWE-bench VerifiedSource —80%Not comparable
SWE-bench ProSource —55.6%Not comparable
ReasoningGPT-5.2 wins
BenchmarkGemini 3 ProGPT-5.2Result
ARC-AGI-2Source 31.1%52.9%GPT-5.2 leads
AA-LCRSource 70.7%72.7%GPT-5.2 leads
CritPtSource 9.1%11.6%GPT-5.2 leads
Knowledge
BenchmarkGemini 3 ProGPT-5.2Result
Artificial Analysis Intelligence IndexSource 39.5%42.2%GPT-5.2 leads
AA-GPQA DiamondSource 90.8%90.3%Gemini 3 Pro leads
AA-HLESource 37.2%35.4%Gemini 3 Pro leads
AA-Omniscience IndexSource 15.8%-1.0%Gemini 3 Pro leads
AA-Omniscience AccuracySource 55.9%43.8%Gemini 3 Pro leads
AA-Omniscience Hallucination RateSource 90.9%79.7%GPT-5.2 leads
AA MMLU-ProSource 89.8%—Not comparable
GPQASource —92.4%Not comparable
MathGPT-5.2 wins
BenchmarkGemini 3 ProGPT-5.2Result
FrontierMath v2 (Tiers 1-3)Source 37.600%40.700%GPT-5.2 leads
FrontierMath v2 (Tier 4)Source 18.750%18.800%GPT-5.2 leads
AA AIME 2025Source —99.0%Not comparable
Multilingual
BenchmarkGemini 3 ProGPT-5.2Result
AA Global-MMLU-LiteSource 92.2%—Not comparable
MultimodalGemini 3 Pro wins
BenchmarkGemini 3 ProGPT-5.2Result
MMMU-ProSource 81%79.5%Gemini 3 Pro leads
MathVisionSource 86.6%83.0%Gemini 3 Pro leads
VideoMMMUSource 87.6%—Not comparable
ScreenSpot ProSource 72.7%—Not comparable
CharXivSource 81.4%82.1%GPT-5.2 leads
V*Source 88.0%75.9%Gemini 3 Pro leads
AA-MMMU-ProSource 80.2%—Not comparable
Design Arena WebsiteSource —1227Not comparable
Inst. Following
BenchmarkGemini 3 ProGPT-5.2Result
AA-IFBenchSource 70.4%75.4%GPT-5.2 leads
Frequently Asked Questions (4)

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

Gemini 3 Pro is ahead on BenchLM's BenchAlign leaderboard, 67.73 to 58.43. The biggest single separator in this matchup is ARC-AGI-2, where the scores are 31.1% and 52.9%.

Which is better for math, Gemini 3 Pro or GPT-5.2?

GPT-5.2 has the edge for math in this comparison, averaging 35.2 versus 32.9. Inside this category, FrontierMath v2 (Tiers 1-3) is the benchmark that creates the most daylight between them.

Which is better for reasoning, Gemini 3 Pro or GPT-5.2?

GPT-5.2 has the edge for reasoning in this comparison, averaging 52.9 versus 31.1. Inside this category, ARC-AGI-2 is the benchmark that creates the most daylight between them.

Which is better for multimodal and grounded tasks, Gemini 3 Pro or GPT-5.2?

Gemini 3 Pro has the edge for multimodal and grounded tasks in this comparison, averaging 81.1 versus 80.4. Inside this category, V* is the benchmark that creates the most daylight between them.

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