Noometry

Model comparison

Gemini 2.5 Pro vs GPT-5.5

GPT-5.5 is the stronger model overall, scoring 63.4 to 45.0 on the Noometry Index. Gemini 2.5 Pro costs 3.3× less per token, which makes it the better buy when GPT-5.5's lead doesn't matter for your workload.

Last verified . 49 shared benchmarks.

Gemini 2.5 Pro Google

45.0

Rank #75 Confirmed

GPT-5.5 OpenAI

63.4

Rank #9 Confirmed

Summary

  • They share 49 benchmarks with published results for both. Gemini 2.5 Pro scores higher in 1 category and GPT-5.5 in 9 categories; 10 gaps are clear of the uncertainty.
  • The widest gap is in math, where GPT-5.5 leads 81.7 to 32.5.
  • The biggest single-benchmark swing is ARC-AGI-2: 4.9% for Gemini 2.5 Pro and 85% for GPT-5.5.
  • Gemini 2.5 Pro is cheaper at $1.25 / $10 per million input/output tokens, against $5 / $30 for GPT-5.5.
  • GPT-5.5 accepts more context: 1.05M tokens versus 1.05M.

Side by side

Gemini 2.5 ProGPT-5.5
ProviderGoogleOpenAI
Noometry Index45.063.4
Released2025-03-252026-04-23
WeightsProprietaryProprietary
Context window1.05M1.05M
Max output66K128K
Input $ / M tokens$1.25$5
Output $ / M tokens$10$30
Results tracked7871

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Category by category

Coding GPT-5.5 leads

Gemini 2.5 Pro: 42.4 (#101), GPT-5.5: 58.2 (#17)

BenchmarkGemini 2.5 ProGPT-5.5
SWE-bench Verified57.6%80.6%
LMArena WebDev12271513
SciCode42.8%56.1%
GSO3.9%40.2%
WeirdML54%84.9%
LMArena Coding14521494
ALE-Bench785.521,943
DeepSWE—67%
FrontierCode—43%
SWE-bench Verified (bash only)53.6%—
Aider Polyglot83.1%—
LiveBench Coding85.9%—
MirrorCode—10%
CadEval64%—
AlgoTune1.51—

Agentic & Tool Use GPT-5.5 leads

Gemini 2.5 Pro: 29.2 (#88), GPT-5.5: 50.7 (#6)

BenchmarkGemini 2.5 ProGPT-5.5
Terminal-Bench32.6%84.7%
Remote Labor Index0.8%6.3%
τ²-bench Banking13.7%44.6%
DeepResearch Bench42.8%54%
LMArena Search11421242
Vending-Bench 2573.647,524
APEX-Agents—55.1%
OSWorld 2.0—13%
GDPval23.3%—
TheAgentCompany30.3%—
PostTrainBench—27.2%
BALROG43.3%—
ExploitBench—47.4%
GBAEval—53.2%
GDP.pdf—26%
METR Time Horizons55.4%—

Reasoning GPT-5.5 leads

Gemini 2.5 Pro: 28.8 (#99), GPT-5.5: 72.8 (#11)

BenchmarkGemini 2.5 ProGPT-5.5
ARC-AGI-24.9%85%
SimpleBench62.4%69%
Kagi LLM Benchmark70.3%88.8%
ARC-AGI-141%95%
CritPt2%27.1%
Chess Puzzles20%54%
LMArena Hard Prompts14551489
DTBench82.4%96%
LMCA34.8%54.3%
Epoch Capabilities Index145.32159.1
ForecastBench61.360.6
NYT Connections (extended)—96.2%
EnigmaEval5.6%—
EBR-Bench—34.3%
LiveBench Reasoning89.8%—
Mystery Game Puzzles—56%
LiveBench Data Analysis79.9%—
Surface Evolver Bench—88.1%
Bench to the Future 3—0.14
LiveBench82.3%—

Math GPT-5.5 leads

Gemini 2.5 Pro: 32.5 (#213), GPT-5.5: 81.7 (#11)

BenchmarkGemini 2.5 ProGPT-5.5
FrontierMath (Tiers 1-3)24.6%85.3%
FrontierMath Tier 40%72.5%
OTIS Mock AIME 2024-202584.7%100%
LMArena Math14501486
FrontierMath (Feb 2025 set)14.1%51.7%
FrontierMath Tier 4 (v1)4.2%35.4%
MathArena Final-Answer Competitions—94.3%
ProofBench—50%
Omni-MATH41.6%—
LiveBench Math90.2%—
MATH Level 595.9%—
FrontierMath Erdős—0%

Knowledge GPT-5.5 leads

Gemini 2.5 Pro: 56.0 (#46), GPT-5.5: 64.4 (#17)

BenchmarkGemini 2.5 ProGPT-5.5
GPQA Diamond85.3%94%
Vectara Hallucination Rate7%9.3%
LMArena Expert14521508
Humanity's Last Exam21.6%—
SimpleQA Verified—63%
MMLU-Pro86.3%—
Confabulations10.6%—
GPQA (HELM)74.9%—

Multimodal GPT-5.5 leads

Gemini 2.5 Pro: 45.2 (#18), GPT-5.5: 46.9 (#12)

BenchmarkGemini 2.5 ProGPT-5.5
LMArena Vision12631297
LMArena Document14211486
GeoBench86%—
VPCT48%—
Blueprint-Bench 2—36.2%
Furniture Assembly—44.2%
SpatialViz-Bench44.7%—

Multilingual GPT-5.5 leads

Gemini 2.5 Pro: 55.3 (#31), GPT-5.5: 56.4 (#20)

BenchmarkGemini 2.5 ProGPT-5.5
LMArena Non-English14511467
LMArena Chinese15071533
LMArena French14721486
LMArena German14871480
LMArena Japanese14611498
LMArena Korean14341460
LMArena Russian14611473
LMArena Spanish14731468

Instruction Following GPT-5.5 leads

Gemini 2.5 Pro: 75.0 (#75), GPT-5.5: 77.5 (#18)

BenchmarkGemini 2.5 ProGPT-5.5
LMArena Instruction Following14371479
LiveBench Instruction Following80.6%—
IFEval84%—

Long Context Gemini 2.5 Pro leads

Gemini 2.5 Pro: 59.8 (#5), GPT-5.5: 48.3 (#12)

BenchmarkGemini 2.5 ProGPT-5.5
LMArena Longer Query14491484
Fiction.LiveBench91.7%—
CL-bench Life—22.2%

Writing & Preference GPT-5.5 leads

Gemini 2.5 Pro: 63.7 (#62), GPT-5.5: 72.7 (#13)

BenchmarkGemini 2.5 ProGPT-5.5
LMArena Text14581472
LMArena Creative Writing14541455
EQ-Bench Creative Writing14211844
LMArena Multi-Turn14531476
Short-Story Creative Writing83.8%—
WildBench85.7%—
EQ-Bench 4—1315
LiveBench Language67.8%—

Frequently asked questions

Is Gemini 2.5 Pro better than GPT-5.5?

GPT-5.5 is the stronger model overall, scoring 63.4 to 45.0 on the Noometry Index. Gemini 2.5 Pro costs 3.3× less per token, which makes it the better buy when GPT-5.5's lead doesn't matter for your workload.

Which is cheaper, Gemini 2.5 Pro or GPT-5.5?

Gemini 2.5 Pro is cheaper. It lists at $1.25 per million input tokens and $10 per million output tokens; GPT-5.5 lists at $5 and $30.

Is Gemini 2.5 Pro or GPT-5.5 better for coding?

GPT-5.5 scores higher on coding benchmarks: 58.2 versus 42.4 in the Noometry coding category.

Which has the bigger context window?

GPT-5.5 does, with 1.05M tokens against 1.05M.

How many benchmarks do Gemini 2.5 Pro and GPT-5.5 share?

49 benchmarks have published results for both models. Gemini 2.5 Pro has 78 scored results on Noometry and GPT-5.5 has 71.

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