Noometry

Model comparison

Claude Opus 4.5 vs Gemini 3.5 Flash

Gemini 3.5 Flash is the stronger model overall, scoring 54.2 to 50.5 on the Noometry Index.

Last verified . 43 shared benchmarks.

Claude Opus 4.5 Anthropic

50.5

Rank #47 Confirmed

Gemini 3.5 Flash Google

54.2

Rank #32 Confirmed

Summary

  • They share 43 benchmarks with published results for both. Claude Opus 4.5 scores higher in 5 categories and Gemini 3.5 Flash in 5 categories; 9 gaps are clear of the uncertainty.
  • The widest gap is in agentic & tool use, where Claude Opus 4.5 leads 47.3 to 24.7.
  • The biggest single-benchmark swing is NYT Connections (extended): 52.5% for Claude Opus 4.5 and 92.6% for Gemini 3.5 Flash.
  • Gemini 3.5 Flash is cheaper at $1.50 / $9 per million input/output tokens, against $5 / $25 for Claude Opus 4.5.
  • Gemini 3.5 Flash accepts more context: 1.05M tokens versus 200K.

Side by side

Claude Opus 4.5Gemini 3.5 Flash
ProviderAnthropicGoogle
Noometry Index50.554.2
Released2025-11-012026-05-19
WeightsProprietaryProprietary
Context window200K1.05M
Max output64K66K
Input $ / M tokens$5$1.50
Output $ / M tokens$25$9
Results tracked6954

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Category by category

Coding Claude Opus 4.5 leads

Claude Opus 4.5: 54.8 (#27), Gemini 3.5 Flash: 49.4 (#49)

BenchmarkClaude Opus 4.5Gemini 3.5 Flash
SWE-bench Verified76.7%79.3%
LMArena WebDev14941499
WeirdML63.7%62.6%
LMArena Coding15041492
ALE-Bench1,025911.02
DeepSWE—37.4%
SWE-bench Verified (bash only)76.8%—
SWE-bench Multilingual70.7%—
SciCode—53.1%
GSO26.5%—
AlgoTune1.77—

Agentic & Tool Use Claude Opus 4.5 leads

Claude Opus 4.5: 47.3 (#12), Gemini 3.5 Flash: 24.7 (#114)

BenchmarkClaude Opus 4.5Gemini 3.5 Flash
Vending-Bench 24,9675,396
Terminal-Bench63.1%—
APEX-Agents—27.5%
Berkeley Function Calling Leaderboard77.5%—
GDPval45.5%—
Remote Labor Index3.8%—
τ²-bench Airline84%—
τ²-bench Banking24.7%—
τ²-bench Retail79.6%—
τ²-bench Telecom92.3%—
Cybench82%—
DeepResearch Bench54.8%—
OSWorld66.3%—
BALROG43.5%—
GBAEval—6.7%
GDP.pdf—14%
LMArena Search1180—
METR Time Horizons75%—

Reasoning Gemini 3.5 Flash leads

Claude Opus 4.5: 42.6 (#51), Gemini 3.5 Flash: 62.8 (#18)

BenchmarkClaude Opus 4.5Gemini 3.5 Flash
ARC-AGI-237.6%72.1%
SimpleBench62%76.7%
NYT Connections (extended)52.5%92.6%
ARC-AGI-180%92.5%
Chess Puzzles12%50%
EnigmaEval11.9%25.4%
EBR-Bench14.3%4.8%
LMArena Hard Prompts14761488
Mystery Game Puzzles22%32%
DTBench89.9%94.7%
LMCA44.5%47.1%
Epoch Capabilities Index150.09154.46
ForecastBench60.759
Kagi LLM Benchmark80.2%—
CritPt—13.1%
Surface Evolver Bench—58.1%

Math Gemini 3.5 Flash leads

Claude Opus 4.5: 38.6 (#132), Gemini 3.5 Flash: 60.7 (#36)

BenchmarkClaude Opus 4.5Gemini 3.5 Flash
FrontierMath (Tiers 1-3)34.4%62.8%
FrontierMath Tier 44.9%26.8%
OTIS Mock AIME 2024-202586.1%95.6%
ProofBench36%31%
LMArena Math14631504
FrontierMath (Feb 2025 set)20.7%39%
FrontierMath Tier 4 (v1)4.2%14.6%
MathArena Final-Answer Competitions—76.3%

Knowledge Gemini 3.5 Flash leads

Claude Opus 4.5: 56.5 (#44), Gemini 3.5 Flash: 66.3 (#11)

BenchmarkClaude Opus 4.5Gemini 3.5 Flash
GPQA Diamond86%92.8%
SimpleQA Verified45.7%66.2%
LMArena Expert14871495
Humanity's Last Exam25.2%—
Vectara Hallucination Rate10.9%—

Multimodal Gemini 3.5 Flash leads

Claude Opus 4.5: 31.4 (#107), Gemini 3.5 Flash: 45.7 (#15)

BenchmarkClaude Opus 4.5Gemini 3.5 Flash
LMArena Document14621463
LMArena Vision—1310
GeoBench75%—
VPCT40%—
Blueprint-Bench 2—33.6%
Furniture Assembly28.3%—

Multilingual Gemini 3.5 Flash leads

Claude Opus 4.5: 54.3 (#47), Gemini 3.5 Flash: 57.0 (#13)

BenchmarkClaude Opus 4.5Gemini 3.5 Flash
LMArena Non-English14381476
LMArena Chinese14701526
LMArena French14711490
LMArena German14491492
LMArena Japanese14161486
LMArena Korean14241451
LMArena Russian14471493
LMArena Spanish14581480

Instruction Following Too close to call

Claude Opus 4.5: 77.5 (#19), Gemini 3.5 Flash: 77.0 (#30)

BenchmarkClaude Opus 4.5Gemini 3.5 Flash
LMArena Instruction Following14781467

Long Context Claude Opus 4.5 leads

Claude Opus 4.5: 46.5 (#22), Gemini 3.5 Flash: 45.4 (#38)

BenchmarkClaude Opus 4.5Gemini 3.5 Flash
LMArena Longer Query14801482
CL-bench21.1%—

Writing & Preference Claude Opus 4.5 leads

Claude Opus 4.5: 68.1 (#28), Gemini 3.5 Flash: 65.5 (#47)

BenchmarkClaude Opus 4.5Gemini 3.5 Flash
LMArena Text14511482
LMArena Creative Writing14451470
LMArena Multi-Turn14661481
EQ-Bench Creative Writing1687—
EQ-Bench 4—1087

Frequently asked questions

Is Claude Opus 4.5 better than Gemini 3.5 Flash?

Gemini 3.5 Flash is the stronger model overall, scoring 54.2 to 50.5 on the Noometry Index.

Which is cheaper, Claude Opus 4.5 or Gemini 3.5 Flash?

Gemini 3.5 Flash is cheaper. It lists at $1.50 per million input tokens and $9 per million output tokens; Claude Opus 4.5 lists at $5 and $25.

Is Claude Opus 4.5 or Gemini 3.5 Flash better for coding?

Claude Opus 4.5 scores higher on coding benchmarks: 54.8 versus 49.4 in the Noometry coding category.

Which has the bigger context window?

Gemini 3.5 Flash does, with 1.05M tokens against 200K.

How many benchmarks do Claude Opus 4.5 and Gemini 3.5 Flash share?

43 benchmarks have published results for both models. Claude Opus 4.5 has 69 scored results on Noometry and Gemini 3.5 Flash has 54.

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