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Model comparison

Gemini 2.5 Pro vs o3

Data verified

Head-to-head evidence from 15 shared benchmark results across 7 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.

57.25/100
Margin
9.4pts
← winning
o3
OpenAI
47.89/100
0 category wins1 category wins

Public leaderboard positions: Gemini 2.5 Pro #70 (Supported); o3 #131 (Supported). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.

Evidence parity. Gemini 2.5 Pro and o3 share 15 comparable benchmark results. 1 of 8 categories are comparable. 9 results are unique to Gemini 2.5 Pro; 1 to o3.

Updated July 20, 2026
Shared results
15
Gemini 2.5 Pro only
9
o3 only
1
Comparable categories
1 / 8

Pick Gemini 2.5 Pro if you want the stronger benchmark profile. o3 only becomes the better choice if mathematics is the priority or you want the cheaper token bill.

Confidence note. This is a partial-evidence comparison with 15 shared benchmark results across 7 evidence categories; 1 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.

Why this result

Gemini 2.5 Pro is clearly ahead on the BenchAlign aggregate, 57.25 to 47.89. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.

Gemini 2.5 Pro is also the more expensive model on tokens at $1.25 input / $10.00 output per 1M tokens, versus $2.00 input / $8.00 output per 1M tokens for o3. o3 is the reasoning model in the pair, while Gemini 2.5 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 2.5 Pro gives you the larger context window at 1M, compared with 200K for o3.

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 2.5 Pro and o3
CategoryGemini 2.5 ProΔo3
MathGemini 2.5 Pro11.6Margin→ 2.9o314.5
CodingGemini 2.5 Pro63.8MarginNo overlapo3Not measured
KnowledgeGemini 2.5 Pro27.4MarginNo overlapo3Not measured

Decisive benchmark drivers

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

More
A · Gemini 2.5 ProB · o3

  1. FrontierMath v2 (Tiers 1-3)

    Math
    Source ↗
    A 14.138%B 18.685%
    Winner: o3Δ 4.5
    FrontierMath v2 (Tiers 1-3): Gemini 2.5 Pro scored 14.138%; o3 scored 18.685%. o3 wins this benchmark.

  2. FrontierMath v2 (Tier 4)

    Math
    Source ↗
    A 4.167%B 2.083%
    Winner: Gemini 2.5 ProΔ 2.1
    FrontierMath v2 (Tier 4): Gemini 2.5 Pro scored 4.167%; o3 scored 2.083%. Gemini 2.5 Pro wins this benchmark.

Operational comparison

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

MetricGemini 2.5 Proo3Comparison
Input / output priceUSD per 1M tokensGemini 2.5 Pro$1.25 input / $10 outputo3$2 input / $8 outputo3 has the lower combined listed price.
Generation speedtokens per secondGemini 2.5 Pro117 tok/so3118 tok/so3 has the higher measured throughput.
First-answer latencyseconds to first tokenGemini 2.5 Pro21.19 so35.38 so3 reaches the first token sooner.
Context windowmaximum listed tokensGemini 2.5 Pro1Mo3200KGemini 2.5 Pro lists the larger context window.

Benchmark Deep Dive

Agentic
BenchmarkGemini 2.5 Proo3Result
AA Agentic IndexSource 7.1%—Not comparable
τ²-bench resultsSource 54.1%80.7%o3 leads
Gert LabsSource 42.01%—Not comparable
GDPval-AASource 8.3%—Not comparable
GDPval-AASource 665—Not comparable
Coding
BenchmarkGemini 2.5 Proo3Result
SWE-bench VerifiedSource 63.8%—Not comparable
Vibe Code BenchSource 0.40%—Not comparable
AA Coding IndexSource 33.3%—Not comparable
AA-SciCodeSource 42.8%41.0%Gemini 2.5 Pro leads
Reasoning
BenchmarkGemini 2.5 Proo3Result
AA-LCRSource 66.0%69.3%o3 leads
CritPtSource 2.6%1.1%Gemini 2.5 Pro leads
Knowledge
BenchmarkGemini 2.5 Proo3Result
GPQASource 83%—Not comparable
HLESource 18.8%—Not comparable
Artificial Analysis Intelligence IndexSource 25.8%30.4%o3 leads
AA-GPQA DiamondSource 84.4%82.7%Gemini 2.5 Pro leads
AA-HLESource 21.1%20.0%Gemini 2.5 Pro leads
AA-Omniscience IndexSource -14.3%-15.3%Gemini 2.5 Pro leads
AA-Omniscience AccuracySource 39.0%38.4%Gemini 2.5 Pro leads
AA-Omniscience Hallucination RateSource 87.4%87.1%o3 leads
Matho3 wins
BenchmarkGemini 2.5 Proo3Result
FrontierMath v2 (Tiers 1-3)Source 14.138%18.685%o3 leads
FrontierMath v2 (Tier 4)Source 4.167%2.083%Gemini 2.5 Pro leads
AA MATH-500Source —99.2%Not comparable
Multimodal
BenchmarkGemini 2.5 Proo3Result
AA-MMMU-ProSource 74.9%70.1%Gemini 2.5 Pro leads
Design Arena WebsiteSource 11991069Gemini 2.5 Pro leads
Inst. Following
BenchmarkGemini 2.5 Proo3Result
AA-IFBenchSource 48.7%71.4%o3 leads
Frequently Asked Questions (2)

Which is better, Gemini 2.5 Pro or o3?

Gemini 2.5 Pro is ahead on BenchLM's BenchAlign leaderboard, 57.25 to 47.89. The biggest single separator in this matchup is FrontierMath v2 (Tiers 1-3), where the scores are 14.138% and 18.685%.

Which is better for math, Gemini 2.5 Pro or o3?

o3 has the edge for math in this comparison, averaging 14.5 versus 11.6. Inside this category, FrontierMath v2 (Tiers 1-3) is the benchmark that creates the most daylight between them.

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Last updated: July 20, 2026

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