Noometry

Model comparison

Gemini 2.5 Pro vs o3-mini

Gemini 2.5 Pro is the stronger model overall, scoring 45.0 to 36.7 on the Noometry Index. o3-mini costs 1.8× less per token, which makes it the better buy when Gemini 2.5 Pro's lead doesn't matter for your workload.

Last verified . 48 shared benchmarks.

Gemini 2.5 Pro Google

45.0

Rank #75 Confirmed

o3-mini OpenAI

36.7

Rank #212 Confirmed

Summary

  • They share 48 benchmarks with published results for both. Gemini 2.5 Pro scores higher in 7 categories and o3-mini in 2 categories; 7 gaps are clear of the uncertainty.
  • The widest gap is in long context, where Gemini 2.5 Pro leads 59.8 to 33.8.
  • The biggest single-benchmark swing is Fiction.LiveBench: 91.7% for Gemini 2.5 Pro and 50% for o3-mini.
  • o3-mini is cheaper at $1.10 / $4.40 per million input/output tokens, against $1.25 / $10 for Gemini 2.5 Pro.
  • Gemini 2.5 Pro accepts more context: 1.05M tokens versus 200K.

Side by side

Gemini 2.5 Proo3-mini
ProviderGoogleOpenAI
Noometry Index45.036.7
Released2025-03-252024-12-20
WeightsProprietaryProprietary
Context window1.05M200K
Max output66K100K
Input $ / M tokens$1.25$1.10
Output $ / M tokens$10$4.40
Results tracked7851

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Category by category

Coding Gemini 2.5 Pro leads

Gemini 2.5 Pro: 42.4 (#101), o3-mini: 40.8 (#132)

BenchmarkGemini 2.5 Proo3-mini
Aider Polyglot83.1%60.4%
SciCode42.8%39.8%
GSO3.9%1.3%
WeirdML54%43.7%
LiveBench Coding85.9%82.7%
LMArena Coding14521378
CadEval64%54%
SWE-bench Verified57.6%—
SWE-bench Verified (bash only)53.6%—
LMArena WebDev1227—
ALE-Bench785.52—
AlgoTune1.51—

Agentic & Tool Use Too close to call

Gemini 2.5 Pro: 29.2 (#88), o3-mini: 29.6 (#84)

BenchmarkGemini 2.5 Proo3-mini
Terminal-Bench32.6%—
GDPval23.3%—
Remote Labor Index0.8%—
TheAgentCompany30.3%—
τ²-bench Banking13.7%—
Cybench—22.5%
DeepResearch Bench42.8%—
BALROG43.3%—
LMArena Search1142—
METR Time Horizons55.4%—
Vending-Bench 2573.64—

Reasoning Gemini 2.5 Pro leads

Gemini 2.5 Pro: 28.8 (#99), o3-mini: 16.3 (#305)

BenchmarkGemini 2.5 Proo3-mini
ARC-AGI-24.9%3%
SimpleBench62.4%22.8%
ARC-AGI-141%34.5%
CritPt2%0.3%
Chess Puzzles20%17%
LiveBench Reasoning89.8%89.6%
LMArena Hard Prompts14551366
DTBench82.4%68.8%
LiveBench Data Analysis79.9%70.6%
LMCA34.8%19%
Epoch Capabilities Index145.32140.34
ForecastBench61.359.6
LiveBench82.3%75.9%
Kagi LLM Benchmark70.3%—
EnigmaEval5.6%—
Mystery Game Puzzles—7%

Math Gemini 2.5 Pro leads

Gemini 2.5 Pro: 32.5 (#213), o3-mini: 28.1 (#244)

BenchmarkGemini 2.5 Proo3-mini
FrontierMath (Tiers 1-3)24.6%18.6%
FrontierMath Tier 40%0%
OTIS Mock AIME 2024-202584.7%76.9%
LiveBench Math90.2%77.3%
LMArena Math14501396
MATH Level 595.9%96.5%
FrontierMath (Feb 2025 set)14.1%12.4%
FrontierMath Tier 4 (v1)4.2%4.2%
Omni-MATH41.6%—

Knowledge Gemini 2.5 Pro leads

Gemini 2.5 Pro: 56.0 (#46), o3-mini: 38.3 (#146)

BenchmarkGemini 2.5 Proo3-mini
GPQA Diamond85.3%77%
Confabulations10.6%17.9%
LMArena Expert14521364
Humanity's Last Exam21.6%—
SimpleQA Verified—15.3%
MMLU-Pro86.3%—
Vectara Hallucination Rate7%—
GPQA (HELM)74.9%—

Multimodal Not comparable

Gemini 2.5 Pro: 45.2 (#18), o3-mini: —

BenchmarkGemini 2.5 Proo3-mini
LMArena Vision1263—
GeoBench86%—
VPCT48%—
LMArena Document1421—
SpatialViz-Bench44.7%—

Multilingual Gemini 2.5 Pro leads

Gemini 2.5 Pro: 55.3 (#31), o3-mini: 45.7 (#164)

BenchmarkGemini 2.5 Proo3-mini
LMArena Non-English14511319
LMArena Chinese15071379
LMArena French14721334
LMArena German14871303
LMArena Japanese14611286
LMArena Korean14341314
LMArena Russian14611304
LMArena Spanish14731321

Instruction Following Too close to call

Gemini 2.5 Pro: 75.0 (#75), o3-mini: 75.1 (#72)

BenchmarkGemini 2.5 Proo3-mini
LiveBench Instruction Following80.6%84.4%
LMArena Instruction Following14371337
IFEval84%—

Long Context Gemini 2.5 Pro leads

Gemini 2.5 Pro: 59.8 (#5), o3-mini: 33.8 (#256)

BenchmarkGemini 2.5 Proo3-mini
Fiction.LiveBench91.7%50%
LMArena Longer Query14491343

Writing & Preference Gemini 2.5 Pro leads

Gemini 2.5 Pro: 63.7 (#62), o3-mini: 50.3 (#182)

BenchmarkGemini 2.5 Proo3-mini
LMArena Text14581337
LMArena Creative Writing14541286
Short-Story Creative Writing83.8%61.7%
LMArena Multi-Turn14531320
LiveBench Language67.8%50.7%
EQ-Bench Creative Writing1421—
WildBench85.7%—

Frequently asked questions

Is Gemini 2.5 Pro better than o3-mini?

Gemini 2.5 Pro is the stronger model overall, scoring 45.0 to 36.7 on the Noometry Index. o3-mini costs 1.8× less per token, which makes it the better buy when Gemini 2.5 Pro's lead doesn't matter for your workload.

Which is cheaper, Gemini 2.5 Pro or o3-mini?

o3-mini is cheaper. It lists at $1.10 per million input tokens and $4.40 per million output tokens; Gemini 2.5 Pro lists at $1.25 and $10.

Is Gemini 2.5 Pro or o3-mini better for coding?

Gemini 2.5 Pro scores higher on coding benchmarks: 42.4 versus 40.8 in the Noometry coding category.

Which has the bigger context window?

Gemini 2.5 Pro does, with 1.05M tokens against 200K.

How many benchmarks do Gemini 2.5 Pro and o3-mini share?

48 benchmarks have published results for both models. Gemini 2.5 Pro has 78 scored results on Noometry and o3-mini has 51.

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