Noometry

Model comparison

Gemini 3 Deep Think vs GPT-5.1

GPT-5.1 has enough public results to be ranked (#53); Gemini 3 Deep Think does not yet, so treat this comparison as directional.

Last verified . 3 shared benchmarks.

Gemini 3 Deep Think Google

58.3

Unranked Sparse

GPT-5.1 OpenAI

49.0

Rank #53 Confirmed

Summary

  • They share 3 benchmarks with published results for both. Gemini 3 Deep Think scores higher in 1 category and GPT-5.1 in 0 categories; one gap is clear of the uncertainty.
  • The widest gap is in reasoning, where Gemini 3 Deep Think leads 70.2 to 39.8.
  • The biggest single-benchmark swing is ARC-AGI-2: 84.6% for Gemini 3 Deep Think and 17.6% for GPT-5.1.

Side by side

Gemini 3 Deep ThinkGPT-5.1
ProviderGoogleOpenAI
Noometry Index58.349.0
Released2026-02-122025-11-13
WeightsProprietaryProprietary
Context window—400K
Max output—128K
Input $ / M tokens—$1.25
Output $ / M tokens—$10
Results tracked363

Sponsored placements are available on pages like this one. Advertise on Noometry

Category by category

Coding Not comparable

Gemini 3 Deep Think: —, GPT-5.1: 46.4 (#66)

BenchmarkGemini 3 Deep ThinkGPT-5.1
SWE-bench Verified—68%
SWE-bench Verified (bash only)—66%
LMArena WebDev—1395
SciCode—43.3%
GSO—13.7%
WeirdML—60.8%
LiveBench Coding—72.5%
LMArena Coding—1454
ALE-Bench—1,192

Agentic & Tool Use Not comparable

Gemini 3 Deep Think: —, GPT-5.1: 32.7 (#60)

BenchmarkGemini 3 Deep ThinkGPT-5.1
Terminal-Bench—47.6%
DeepResearch Bench—42.8%
LMArena Search—1199
Vending-Bench 2—1,473

Reasoning Gemini 3 Deep Think leads

Gemini 3 Deep Think: 70.2 (#14), GPT-5.1: 39.8 (#58)

BenchmarkGemini 3 Deep ThinkGPT-5.1
ARC-AGI-284.6%17.6%
ARC-AGI-196%72.8%
CritPt25.7%4.9%
SimpleBench—53.2%
Chess Puzzles—32%
EnigmaEval—11.2%
LiveBench Reasoning—95.8%
LMArena Hard Prompts—1457
Mystery Game Puzzles—19%
DTBench—90.1%
LiveBench Data Analysis—72.1%
LMCA—43.9%
Epoch Capabilities Index—149.64
ForecastBench—58.1
LiveBench—78.8%

Math Not comparable

Gemini 3 Deep Think: —, GPT-5.1: 52.2 (#51)

BenchmarkGemini 3 Deep ThinkGPT-5.1
OTIS Mock AIME 2024-2025—88.6%
Omni-MATH—46.4%
LiveBench Math—94.5%
LMArena Math—1447
FrontierMath (Feb 2025 set)—31%
FrontierMath Tier 4 (v1)—12.5%

Knowledge Not comparable

Gemini 3 Deep Think: —, GPT-5.1: 50.6 (#71)

BenchmarkGemini 3 Deep ThinkGPT-5.1
GPQA Diamond—87.6%
Humanity's Last Exam—23.7%
SimpleQA Verified—48%
MMLU-Pro—57.9%
Vectara Hallucination Rate—10.9%
GPQA (HELM)—44.2%
LMArena Expert—1470

Multimodal Not comparable

Gemini 3 Deep Think: —, GPT-5.1: 44.8 (#19)

BenchmarkGemini 3 Deep ThinkGPT-5.1
LMArena Vision—1250
VPCT—58.7%
LMArena Document—1403

Multilingual Not comparable

Gemini 3 Deep Think: —, GPT-5.1: 53.8 (#56)

BenchmarkGemini 3 Deep ThinkGPT-5.1
LMArena Non-English—1431
LMArena Chinese—1495
LMArena French—1450
LMArena German—1438
LMArena Japanese—1453
LMArena Korean—1401
LMArena Russian—1435
LMArena Spanish—1433

Instruction Following Not comparable

Gemini 3 Deep Think: —, GPT-5.1: 83.9 (#1)

BenchmarkGemini 3 Deep ThinkGPT-5.1
LiveBench Instruction Following—93.3%
IFEval—93.5%
LMArena Instruction Following—1443

Long Context Not comparable

Gemini 3 Deep Think: —, GPT-5.1: 47.6 (#14)

BenchmarkGemini 3 Deep ThinkGPT-5.1
CL-bench—23.7%
CL-bench Life—17.3%
LMArena Longer Query—1447

Writing & Preference Not comparable

Gemini 3 Deep Think: —, GPT-5.1: 64.5 (#55)

BenchmarkGemini 3 Deep ThinkGPT-5.1
LMArena Text—1443
LMArena Creative Writing—1427
WildBench—86.3%
LMArena Multi-Turn—1450
LiveBench Language—80.2%

Frequently asked questions

Is Gemini 3 Deep Think better than GPT-5.1?

GPT-5.1 has enough public results to be ranked (#53); Gemini 3 Deep Think does not yet, so treat this comparison as directional.

How many benchmarks do Gemini 3 Deep Think and GPT-5.1 share?

3 benchmarks have published results for both models. Gemini 3 Deep Think has 3 scored results on Noometry and GPT-5.1 has 63.

Related comparisons

Go deeper