Noometry

Model comparison

Claude Opus 4.5 vs Gemini 3.1 Flash Lite

Claude Opus 4.5 is the stronger model overall, scoring 50.5 to 40.8 on the Noometry Index. Gemini 3.1 Flash Lite costs 18× less per token, which makes it the better buy when Claude Opus 4.5's lead doesn't matter for your workload.

Last verified . 34 shared benchmarks.

Claude Opus 4.5 Anthropic

50.5

Rank #47 Confirmed

Gemini 3.1 Flash Lite Google

40.8

Rank #144 Confirmed

Summary

  • They share 34 benchmarks with published results for both. Claude Opus 4.5 scores higher in 8 categories and Gemini 3.1 Flash Lite in 2 categories; 10 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Claude Opus 4.5 leads 42.6 to 22.9.
  • The biggest single-benchmark swing is NYT Connections (extended): 52.5% for Claude Opus 4.5 and 8.2% for Gemini 3.1 Flash Lite.
  • Gemini 3.1 Flash Lite is cheaper at $0.25 / $1.50 per million input/output tokens, against $5 / $25 for Claude Opus 4.5.
  • Gemini 3.1 Flash Lite accepts more context: 1.05M tokens versus 200K.

Side by side

Claude Opus 4.5Gemini 3.1 Flash Lite
ProviderAnthropicGoogle
Noometry Index50.540.8
Released2025-11-012026-03-03
WeightsProprietaryProprietary
Context window200K1.05M
Max output64K66K
Input $ / M tokens$5$0.25
Output $ / M tokens$25$1.50
Results tracked6938

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Category by category

Coding Claude Opus 4.5 leads

Claude Opus 4.5: 54.8 (#27), Gemini 3.1 Flash Lite: 37.8 (#188)

BenchmarkClaude Opus 4.5Gemini 3.1 Flash Lite
LMArena WebDev14941256
WeirdML63.7%52.2%
LMArena Coding15041400
ALE-Bench1,025797.73
SWE-bench Verified76.7%—
SWE-bench Verified (bash only)76.8%—
SWE-bench Multilingual70.7%—
SciCode—41.9%
GSO26.5%—
AlgoTune1.77—

Agentic & Tool Use Claude Opus 4.5 leads

Claude Opus 4.5: 47.3 (#12), Gemini 3.1 Flash Lite: 30.2 (#79)

BenchmarkClaude Opus 4.5Gemini 3.1 Flash Lite
DeepResearch Bench54.8%37.3%
Terminal-Bench63.1%—
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%—
OSWorld66.3%—
BALROG43.5%—
LMArena Search1180—
METR Time Horizons75%—
Vending-Bench 24,967—

Reasoning Claude Opus 4.5 leads

Claude Opus 4.5: 42.6 (#51), Gemini 3.1 Flash Lite: 22.9 (#186)

BenchmarkClaude Opus 4.5Gemini 3.1 Flash Lite
Kagi LLM Benchmark80.2%67.2%
NYT Connections (extended)52.5%8.2%
Chess Puzzles12%25%
EnigmaEval11.9%3%
LMArena Hard Prompts14761407
DTBench89.9%76.8%
LMCA44.5%35%
Epoch Capabilities Index150.09144.47
ForecastBench60.754.4
ARC-AGI-237.6%—
SimpleBench62%—
ARC-AGI-180%—
CritPt—1.1%
Thematic Generalization—63.3%
EBR-Bench14.3%—
Mystery Game Puzzles22%—

Math Gemini 3.1 Flash Lite leads

Claude Opus 4.5: 38.6 (#132), Gemini 3.1 Flash Lite: 40.7 (#90)

BenchmarkClaude Opus 4.5Gemini 3.1 Flash Lite
FrontierMath (Tiers 1-3)34.4%27.7%
OTIS Mock AIME 2024-202586.1%80%
LMArena Math14631428
FrontierMath Tier 44.9%—
ProofBench36%—
FrontierMath (Feb 2025 set)20.7%—
FrontierMath Tier 4 (v1)4.2%—

Knowledge Claude Opus 4.5 leads

Claude Opus 4.5: 56.5 (#44), Gemini 3.1 Flash Lite: 41.9 (#104)

BenchmarkClaude Opus 4.5Gemini 3.1 Flash Lite
GPQA Diamond86%81.8%
Humanity's Last Exam25.2%8.6%
Vectara Hallucination Rate10.9%8.2%
LMArena Expert14871398
SimpleQA Verified45.7%—

Multimodal Gemini 3.1 Flash Lite leads

Claude Opus 4.5: 31.4 (#107), Gemini 3.1 Flash Lite: 39.4 (#60)

BenchmarkClaude Opus 4.5Gemini 3.1 Flash Lite
LMArena Vision—1240
GeoBench75%—
VPCT40%—
Furniture Assembly28.3%—
LMArena Document1462—

Multilingual Claude Opus 4.5 leads

Claude Opus 4.5: 54.3 (#47), Gemini 3.1 Flash Lite: 52.3 (#86)

BenchmarkClaude Opus 4.5Gemini 3.1 Flash Lite
LMArena Non-English14381411
LMArena Chinese14701461
LMArena French14711424
LMArena German14491429
LMArena Japanese14161413
LMArena Korean14241392
LMArena Russian14471420
LMArena Spanish14581421

Instruction Following Claude Opus 4.5 leads

Claude Opus 4.5: 77.5 (#19), Gemini 3.1 Flash Lite: 72.7 (#131)

BenchmarkClaude Opus 4.5Gemini 3.1 Flash Lite
LMArena Instruction Following14781377

Long Context Claude Opus 4.5 leads

Claude Opus 4.5: 46.5 (#22), Gemini 3.1 Flash Lite: 42.5 (#122)

BenchmarkClaude Opus 4.5Gemini 3.1 Flash Lite
LMArena Longer Query14801394
CL-bench21.1%—

Writing & Preference Claude Opus 4.5 leads

Claude Opus 4.5: 68.1 (#28), Gemini 3.1 Flash Lite: 60.9 (#94)

BenchmarkClaude Opus 4.5Gemini 3.1 Flash Lite
LMArena Text14511416
LMArena Creative Writing14451401
LMArena Multi-Turn14661417
EQ-Bench Creative Writing1687—

Frequently asked questions

Is Claude Opus 4.5 better than Gemini 3.1 Flash Lite?

Claude Opus 4.5 is the stronger model overall, scoring 50.5 to 40.8 on the Noometry Index. Gemini 3.1 Flash Lite costs 18× less per token, which makes it the better buy when Claude Opus 4.5's lead doesn't matter for your workload.

Which is cheaper, Claude Opus 4.5 or Gemini 3.1 Flash Lite?

Gemini 3.1 Flash Lite is cheaper. It lists at $0.25 per million input tokens and $1.50 per million output tokens; Claude Opus 4.5 lists at $5 and $25.

Is Claude Opus 4.5 or Gemini 3.1 Flash Lite better for coding?

Claude Opus 4.5 scores higher on coding benchmarks: 54.8 versus 37.8 in the Noometry coding category.

Which has the bigger context window?

Gemini 3.1 Flash Lite does, with 1.05M tokens against 200K.

How many benchmarks do Claude Opus 4.5 and Gemini 3.1 Flash Lite share?

34 benchmarks have published results for both models. Claude Opus 4.5 has 69 scored results on Noometry and Gemini 3.1 Flash Lite has 38.

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