Noometry

Model comparison

Claude Sonnet 5.5 vs Gemini 2.5 Pro

Claude Sonnet 5.5 is the stronger model overall, scoring 61.9 to 45.0 on the Noometry Index.

Last verified . 22 shared benchmarks.

Claude Sonnet 5.5 Anthropic

61.9

Rank #10 Confirmed

Gemini 2.5 Pro Google

45.0

Rank #75 Confirmed

Summary

  • They share 22 benchmarks with published results for both. Claude Sonnet 5.5 scores higher in 9 categories and Gemini 2.5 Pro in 1 category; 9 gaps are clear of the uncertainty.
  • The widest gap is in math, where Claude Sonnet 5.5 leads 87.9 to 32.5.
  • The biggest single-benchmark swing is FrontierMath Tier 4: 80.5% for Claude Sonnet 5.5 and 0% for Gemini 2.5 Pro.
  • Gemini 2.5 Pro is cheaper at $1.25 / $10 per million input/output tokens, against $2 / $10 for Claude Sonnet 5.5.
  • Gemini 2.5 Pro accepts more context: 1.05M tokens versus 1M.

Side by side

Claude Sonnet 5.5Gemini 2.5 Pro
ProviderAnthropicGoogle
Noometry Index61.945.0
Released2026-09-282025-03-25
WeightsProprietaryProprietary
Context window1M1.05M
Max output128K66K
Input $ / M tokens$2$1.25
Output $ / M tokens$10$10
Results tracked3278

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Category by category

Coding Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 67.3 (#6), Gemini 2.5 Pro: 42.4 (#101)

BenchmarkClaude Sonnet 5.5Gemini 2.5 Pro
LMArena WebDev17741227
SciCode61%42.8%
LMArena Coding15131452
ALE-Bench1,819785.52
SWE-bench Verified—57.6%
FrontierCode52.1%—
SWE-bench Verified (bash only)—53.6%
Aider Polyglot—83.1%
CursorBench55.5%—
FrontierSWE61.9%—
GSO—3.9%
WeirdML—54%
LiveBench Coding—85.9%
CadEval—64%
AlgoTune—1.51

Agentic & Tool Use Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 45.0 (#16), Gemini 2.5 Pro: 29.2 (#88)

BenchmarkClaude Sonnet 5.5Gemini 2.5 Pro
Terminal-Bench—32.6%
APEX-Agents75.5%—
GDPval—23.3%
Remote Labor Index—0.8%
TheAgentCompany—30.3%
τ²-bench Banking—13.7%
DeepResearch Bench—42.8%
BALROG—43.3%
LMArena Search—1142
METR Time Horizons—55.4%
Vending-Bench 2—573.64

Reasoning Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 54.0 (#28), Gemini 2.5 Pro: 28.8 (#99)

BenchmarkClaude Sonnet 5.5Gemini 2.5 Pro
CritPt31.4%2%
LMArena Hard Prompts14951455
Epoch Capabilities Index165.03145.32
ARC-AGI-2—4.9%
SimpleBench—62.4%
Kagi LLM Benchmark—70.3%
NYT Connections (extended)80.5%—
ARC-AGI-1—41%
Chess Puzzles—20%
EnigmaEval—5.6%
LiveBench Reasoning—89.8%
Mystery Game Puzzles65%—
DTBench—82.4%
LiveBench Data Analysis—79.9%
LMCA—34.8%
ForecastBench—61.3
LiveBench—82.3%

Math Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 87.9 (#6), Gemini 2.5 Pro: 32.5 (#213)

BenchmarkClaude Sonnet 5.5Gemini 2.5 Pro
FrontierMath (Tiers 1-3)88.8%24.6%
FrontierMath Tier 480.5%0%
OTIS Mock AIME 2024-2025100%84.7%
LMArena Math15101450
ProofBench100%—
Omni-MATH—41.6%
LiveBench Math—90.2%
MATH Level 5—95.9%
FrontierMath (Feb 2025 set)—14.1%
FrontierMath Erdős2.9%—
FrontierMath Tier 4 (v1)—4.2%

Knowledge Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 66.0 (#12), Gemini 2.5 Pro: 56.0 (#46)

BenchmarkClaude Sonnet 5.5Gemini 2.5 Pro
GPQA Diamond95.6%85.3%
LMArena Expert15401452
Humanity's Last Exam—21.6%
SimpleQA Verified46.5%—
MMLU-Pro—86.3%
Confabulations—10.6%
Vectara Hallucination Rate—7%
GPQA (HELM)—74.9%

Multimodal Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 51.5 (#6), Gemini 2.5 Pro: 45.2 (#18)

BenchmarkClaude Sonnet 5.5Gemini 2.5 Pro
LMArena Vision12891263
GeoBench—86%
VPCT—48%
Furniture Assembly75%—
LMArena Document—1421
SpatialViz-Bench—44.7%

Multilingual Too close to call

Claude Sonnet 5.5: 55.3 (#30), Gemini 2.5 Pro: 55.3 (#31)

BenchmarkClaude Sonnet 5.5Gemini 2.5 Pro
LMArena Non-English14521451
LMArena Chinese15221507
LMArena Russian14511461
LMArena French—1472
LMArena German—1487
LMArena Japanese—1461
LMArena Korean—1434
LMArena Spanish—1473

Instruction Following Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 78.3 (#11), Gemini 2.5 Pro: 75.0 (#75)

BenchmarkClaude Sonnet 5.5Gemini 2.5 Pro
LMArena Instruction Following14951437
LiveBench Instruction Following—80.6%
IFEval—84%

Long Context Gemini 2.5 Pro leads

Claude Sonnet 5.5: 45.9 (#28), Gemini 2.5 Pro: 59.8 (#5)

BenchmarkClaude Sonnet 5.5Gemini 2.5 Pro
LMArena Longer Query14981449
Fiction.LiveBench—91.7%

Writing & Preference Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 66.0 (#40), Gemini 2.5 Pro: 63.7 (#62)

BenchmarkClaude Sonnet 5.5Gemini 2.5 Pro
LMArena Text14711458
LMArena Creative Writing14651454
LMArena Multi-Turn14741453
Short-Story Creative Writing—83.8%
EQ-Bench Creative Writing—1421
WildBench—85.7%
LiveBench Language—67.8%

Frequently asked questions

Is Claude Sonnet 5.5 better than Gemini 2.5 Pro?

Claude Sonnet 5.5 is the stronger model overall, scoring 61.9 to 45.0 on the Noometry Index.

Which is cheaper, Claude Sonnet 5.5 or Gemini 2.5 Pro?

Gemini 2.5 Pro is cheaper. It lists at $1.25 per million input tokens and $10 per million output tokens; Claude Sonnet 5.5 lists at $2 and $10.

Is Claude Sonnet 5.5 or Gemini 2.5 Pro better for coding?

Claude Sonnet 5.5 scores higher on coding benchmarks: 67.3 versus 42.4 in the Noometry coding category.

Which has the bigger context window?

Gemini 2.5 Pro does, with 1.05M tokens against 1M.

How many benchmarks do Claude Sonnet 5.5 and Gemini 2.5 Pro share?

22 benchmarks have published results for both models. Claude Sonnet 5.5 has 32 scored results on Noometry and Gemini 2.5 Pro has 78.

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