Noometry

Model comparison

Claude Opus 4.5 vs Gemini 3.1 Pro Preview

Gemini 3.1 Pro Preview is the stronger model overall, scoring 56.7 to 50.5 on the Noometry Index.

Last verified . 56 shared benchmarks.

Claude Opus 4.5 Anthropic

50.5

Rank #39 Confirmed

Gemini 3.1 Pro Preview Google

56.7

Rank #20 Confirmed

Summary

  • They share 56 benchmarks with published results for both. Claude Opus 4.5 scores higher in 4 categories and Gemini 3.1 Pro Preview in 6 categories; 8 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Gemini 3.1 Pro Preview leads 71.7 to 42.5.
  • The biggest single-benchmark swing is NYT Connections (extended): 52.5% for Claude Opus 4.5 and 97.4% for Gemini 3.1 Pro Preview.
  • Gemini 3.1 Pro Preview is cheaper at $2 / $12 per million input/output tokens, against $5 / $25 for Claude Opus 4.5.
  • Gemini 3.1 Pro Preview accepts more context: 1.05M tokens versus 200K.

Side by side

Claude Opus 4.5Gemini 3.1 Pro Preview
ProviderAnthropicGoogle
Noometry Index50.556.7
Released2025-11-012026-02-19
WeightsProprietaryProprietary
Context window200K1.05M
Max output64K66K
Input $ / M tokens$5$2
Output $ / M tokens$25$12
Results tracked6971

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Category by category

Coding Claude Opus 4.5 leads

Claude Opus 4.5: 55.4 (#21), Gemini 3.1 Pro Preview: 42.7 (#88)

BenchmarkClaude Opus 4.5Gemini 3.1 Pro Preview
SWE-bench Verified76.7%75.6%
LMArena WebDev14931446
GSO26.5%22.6%
WeirdML63.7%72.1%
LMArena Coding15041483
ALE-Bench1,0251,161
AlgoTune1.772.02
DeepSWE—11.7%
SWE-bench Verified (bash only)76.8%—
SWE-bench Multilingual70.7%—
SciCode—58.9%
MirrorCode—8.9%

Agentic & Tool Use Claude Opus 4.5 leads

Claude Opus 4.5: 47.2 (#11), Gemini 3.1 Pro Preview: 37.7 (#33)

BenchmarkClaude Opus 4.5Gemini 3.1 Pro Preview
Terminal-Bench63.1%80.2%
τ²-bench Banking24.7%26%
DeepResearch Bench54.8%47.8%
BALROG43.5%57%
LMArena Search11801211
METR Time Horizons75%77%
Vending-Bench 24,9673,774
APEX-Agents—35.3%
Berkeley Function Calling Leaderboard77.5%—
GDPval45.5%—
Remote Labor Index3.8%—
τ²-bench Airline84%—
τ²-bench Retail79.6%—
τ²-bench Telecom92.3%—
Cybench82%—
OSWorld66.3%—
PostTrainBench—22%
ExploitBench—26.1%
GBAEval—0.8%
GDP.pdf—17%

Reasoning Gemini 3.1 Pro Preview leads

Claude Opus 4.5: 42.5 (#43), Gemini 3.1 Pro Preview: 71.7 (#9)

BenchmarkClaude Opus 4.5Gemini 3.1 Pro Preview
ARC-AGI-237.6%77.1%
SimpleBench62%79.6%
NYT Connections (extended)52.5%97.4%
ARC-AGI-180%98%
Chess Puzzles12%55%
EnigmaEval11.9%36.8%
EBR-Bench14.3%14.3%
LMArena Hard Prompts14761484
Mystery Game Puzzles22%34%
DTBench89.9%97.1%
LMCA44.5%53.8%
Epoch Capabilities Index150.1154.92
ForecastBench60.759
Kagi LLM Benchmark80.2%—
CritPt—17.7%
Thematic Generalization—79.4%

Math Gemini 3.1 Pro Preview leads

Claude Opus 4.5: 38.5 (#85), Gemini 3.1 Pro Preview: 61.8 (#28)

BenchmarkClaude Opus 4.5Gemini 3.1 Pro Preview
FrontierMath (Tiers 1-3)34.4%59.6%
FrontierMath Tier 44.9%26.8%
OTIS Mock AIME 2024-202586.1%95.6%
ProofBench36%26%
LMArena Math14631485
FrontierMath (Feb 2025 set)20.7%36.9%
FrontierMath Tier 4 (v1)4.2%16.7%
MathArena Final-Answer Competitions—86.5%

Knowledge Gemini 3.1 Pro Preview leads

Claude Opus 4.5: 56.4 (#38), Gemini 3.1 Pro Preview: 71.8 (#3)

BenchmarkClaude Opus 4.5Gemini 3.1 Pro Preview
GPQA Diamond86%94.4%
Humanity's Last Exam25.2%46.4%
SimpleQA Verified45.7%73.5%
Vectara Hallucination Rate10.9%10.4%
LMArena Expert14881484

Multimodal Gemini 3.1 Pro Preview leads

Claude Opus 4.5: 31.1 (#99), Gemini 3.1 Pro Preview: 38.1 (#60)

BenchmarkClaude Opus 4.5Gemini 3.1 Pro Preview
Furniture Assembly28.3%26.7%
LMArena Document14621444
LMArena Vision—1296
GeoBench75%—
VPCT40%—
Blueprint-Bench 2—26.5%

Multilingual Gemini 3.1 Pro Preview leads

Claude Opus 4.5: 54.5 (#45), Gemini 3.1 Pro Preview: 57.1 (#11)

BenchmarkClaude Opus 4.5Gemini 3.1 Pro Preview
LMArena Non-English14381475
LMArena Chinese14701528
LMArena French14711488
LMArena German14491491
LMArena Japanese14151494
LMArena Korean14241458
LMArena Russian14481496
LMArena Spanish14551480

Instruction Following Too close to call

Claude Opus 4.5: 77.7 (#20), Gemini 3.1 Pro Preview: 77.1 (#31)

BenchmarkClaude Opus 4.5Gemini 3.1 Pro Preview
LMArena Instruction Following14781465

Long Context Too close to call

Claude Opus 4.5: 46.4 (#21), Gemini 3.1 Pro Preview: 47.3 (#17)

BenchmarkClaude Opus 4.5Gemini 3.1 Pro Preview
CL-bench21.1%20.8%
LMArena Longer Query14801482
CL-bench Life—16.9%

Writing & Preference Claude Opus 4.5 leads

Claude Opus 4.5: 68.2 (#28), Gemini 3.1 Pro Preview: 66.3 (#36)

BenchmarkClaude Opus 4.5Gemini 3.1 Pro Preview
LMArena Text14511480
LMArena Creative Writing14451482
EQ-Bench Creative Writing16871491
LMArena Multi-Turn14661486
EQ-Bench 4—1142

Frequently asked questions

Is Claude Opus 4.5 better than Gemini 3.1 Pro Preview?

Gemini 3.1 Pro Preview is the stronger model overall, scoring 56.7 to 50.5 on the Noometry Index.

Which is cheaper, Claude Opus 4.5 or Gemini 3.1 Pro Preview?

Gemini 3.1 Pro Preview is cheaper. It lists at $2 per million input tokens and $12 per million output tokens; Claude Opus 4.5 lists at $5 and $25.

Is Claude Opus 4.5 or Gemini 3.1 Pro Preview better for coding?

Claude Opus 4.5 scores higher on coding benchmarks: 55.4 versus 42.7 in the Noometry coding category.

Which has the bigger context window?

Gemini 3.1 Pro Preview does, with 1.05M tokens against 200K.

How many benchmarks do Claude Opus 4.5 and Gemini 3.1 Pro Preview share?

56 benchmarks have published results for both models. Claude Opus 4.5 has 69 scored results on Noometry and Gemini 3.1 Pro Preview has 71.

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