Noometry

Model comparison

Claude Sonnet 4.5 vs Gemini 2.5 Flash-Lite

Claude Sonnet 4.5 is the stronger model overall, scoring 44.0 to 36.4 on the Noometry Index. Gemini 2.5 Flash-Lite costs 34× less per token, which makes it the better buy when Claude Sonnet 4.5's lead doesn't matter for your workload.

Last verified . 31 shared benchmarks.

Claude Sonnet 4.5 Anthropic

44.0

Rank #76 Confirmed

Gemini 2.5 Flash-Lite Google

36.4

Rank #208 Confirmed

Summary

  • They share 31 benchmarks with published results for both. Claude Sonnet 4.5 scores higher in 9 categories and Gemini 2.5 Flash-Lite in 1 category; 10 gaps are clear of the uncertainty.
  • The widest gap is in knowledge, where Claude Sonnet 4.5 leads 48.4 to 32.1.
  • The biggest single-benchmark swing is GPQA (HELM): 68.6% for Claude Sonnet 4.5 and 30.9% for Gemini 2.5 Flash-Lite.
  • Gemini 2.5 Flash-Lite is cheaper at $0.10 / $0.40 per million input/output tokens, against $3 / $15 for Claude Sonnet 4.5.
  • Gemini 2.5 Flash-Lite accepts more context: 1.05M tokens versus 1M.

Side by side

Claude Sonnet 4.5Gemini 2.5 Flash-Lite
ProviderAnthropicGoogle
Noometry Index44.036.4
Released2025-09-292025-06-17
WeightsProprietaryProprietary
Context window1M1.05M
Max output64K66K
Input $ / M tokens$3$0.10
Output $ / M tokens$15$0.40
Results tracked7333

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Category by category

Coding Claude Sonnet 4.5 leads

Claude Sonnet 4.5: 47.8 (#54), Gemini 2.5 Flash-Lite: 38.0 (#167)

BenchmarkClaude Sonnet 4.5Gemini 2.5 Flash-Lite
WeirdML47.7%35.2%
LMArena Coding14891373
ALE-Bench796.15325.9
SWE-bench Verified71.3%—
SWE-bench Verified (bash only)71.4%—
LMArena WebDev1393—
SWE-bench Multilingual67%—
SciCode44.7%—
GSO14.7%—
AlgoTune1.52—

Agentic & Tool Use Claude Sonnet 4.5 leads

Claude Sonnet 4.5: 38.1 (#30), Gemini 2.5 Flash-Lite: 27.8 (#89)

BenchmarkClaude Sonnet 4.5Gemini 2.5 Flash-Lite
Berkeley Function Calling Leaderboard73.2%36.9%
Terminal-Bench46.5%—
GDPval42.5%—
Remote Labor Index2.1%—
τ²-bench Airline72%—
τ²-bench Banking25.3%—
τ²-bench Retail72.4%—
τ²-bench Telecom84.9%—
Cybench60%—
DeepResearch Bench52.6%—
OSWorld62.9%—
LMArena Search1159—
METR Time Horizons67.4%—
Vending-Bench 23,839—

Reasoning Claude Sonnet 4.5 leads

Claude Sonnet 4.5: 26.9 (#113), Gemini 2.5 Flash-Lite: 21.5 (#196)

BenchmarkClaude Sonnet 4.5Gemini 2.5 Flash-Lite
Kagi LLM Benchmark57.9%40.5%
LMArena Hard Prompts14621377
DTBench83.2%62.8%
LMCA38.8%18.1%
Epoch Capabilities Index146.84133.93
ARC-AGI-213.6%—
SimpleBench54.3%—
NYT Connections (extended)37.3%—
ARC-AGI-163.7%—
CritPt1.1%—
Chess Puzzles12%—
EnigmaEval6%—
EBR-Bench2.4%—
Mystery Game Puzzles17%—
ForecastBench61.9—

Math Gemini 2.5 Flash-Lite leads

Claude Sonnet 4.5: 31.9 (#190), Gemini 2.5 Flash-Lite: 35.5 (#144)

BenchmarkClaude Sonnet 4.5Gemini 2.5 Flash-Lite
Omni-MATH55.3%48%
LMArena Math14481373
FrontierMath (Tiers 1-3)23.9%—
FrontierMath Tier 42.4%—
OTIS Mock AIME 2024-202577.8%—
ProofBench19%—
MATH Level 597.7%—
FrontierMath (Feb 2025 set)15.2%—
FrontierMath Tier 4 (v1)4.2%—

Knowledge Claude Sonnet 4.5 leads

Claude Sonnet 4.5: 48.4 (#70), Gemini 2.5 Flash-Lite: 32.1 (#206)

BenchmarkClaude Sonnet 4.5Gemini 2.5 Flash-Lite
MMLU-Pro86.9%53.7%
Vectara Hallucination Rate12%3.3%
GPQA (HELM)68.6%30.9%
LMArena Expert14831373
GPQA Diamond82.3%—
Humanity's Last Exam13.7%—
SimpleQA Verified30.7%—

Multimodal Claude Sonnet 4.5 leads

Claude Sonnet 4.5: 34.1 (#84), Gemini 2.5 Flash-Lite: 28.6 (#109)

BenchmarkClaude Sonnet 4.5Gemini 2.5 Flash-Lite
VPCT39.8%30%
LMArena Vision—1198
LMArena Document1450—

Multilingual Claude Sonnet 4.5 leads

Claude Sonnet 4.5: 53.6 (#65), Gemini 2.5 Flash-Lite: 49.5 (#129)

BenchmarkClaude Sonnet 4.5Gemini 2.5 Flash-Lite
LMArena Non-English14251369
LMArena Chinese14591404
LMArena French14591388
LMArena German14271390
LMArena Japanese13901359
LMArena Korean14031358
LMArena Russian14361373
LMArena Spanish14571396

Instruction Following Claude Sonnet 4.5 leads

Claude Sonnet 4.5: 75.2 (#74), Gemini 2.5 Flash-Lite: 70.2 (#163)

BenchmarkClaude Sonnet 4.5Gemini 2.5 Flash-Lite
IFEval85%81%
LMArena Instruction Following14591366

Long Context Claude Sonnet 4.5 leads

Claude Sonnet 4.5: 45.2 (#45), Gemini 2.5 Flash-Lite: 33.3 (#257)

BenchmarkClaude Sonnet 4.5Gemini 2.5 Flash-Lite
LMArena Longer Query14761373
Fiction.LiveBench—47.2%

Writing & Preference Claude Sonnet 4.5 leads

Claude Sonnet 4.5: 66.7 (#33), Gemini 2.5 Flash-Lite: 57.0 (#130)

BenchmarkClaude Sonnet 4.5Gemini 2.5 Flash-Lite
LMArena Text14391379
LMArena Creative Writing14421366
WildBench85.4%81.8%
LMArena Multi-Turn14651367
EQ-Bench Creative Writing1678—

Frequently asked questions

Is Claude Sonnet 4.5 better than Gemini 2.5 Flash-Lite?

Claude Sonnet 4.5 is the stronger model overall, scoring 44.0 to 36.4 on the Noometry Index. Gemini 2.5 Flash-Lite costs 34× less per token, which makes it the better buy when Claude Sonnet 4.5's lead doesn't matter for your workload.

Which is cheaper, Claude Sonnet 4.5 or Gemini 2.5 Flash-Lite?

Gemini 2.5 Flash-Lite is cheaper. It lists at $0.10 per million input tokens and $0.40 per million output tokens; Claude Sonnet 4.5 lists at $3 and $15.

Is Claude Sonnet 4.5 or Gemini 2.5 Flash-Lite better for coding?

Claude Sonnet 4.5 scores higher on coding benchmarks: 47.8 versus 38.0 in the Noometry coding category.

Which has the bigger context window?

Gemini 2.5 Flash-Lite does, with 1.05M tokens against 1M.

How many benchmarks do Claude Sonnet 4.5 and Gemini 2.5 Flash-Lite share?

31 benchmarks have published results for both models. Claude Sonnet 4.5 has 73 scored results on Noometry and Gemini 2.5 Flash-Lite has 33.

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