Noometry

Model comparison

Claude Sonnet 5.5 vs Gemini 3 Deep Think

Claude Sonnet 5.5 has enough public results to be ranked (#10); Gemini 3 Deep Think does not yet, so treat this comparison as directional.

Last verified . 1 shared benchmarks.

Claude Sonnet 5.5 Anthropic

61.9

Rank #10 Confirmed

Gemini 3 Deep Think Google

58.3

Unranked Sparse

Summary

  • They share 1 benchmark with published results for both. Claude Sonnet 5.5 scores higher in 0 categories and Gemini 3 Deep Think in 1 category; one gap is clear of the uncertainty.
  • The widest gap is in reasoning, where Gemini 3 Deep Think leads 70.2 to 54.0.
  • The biggest single-benchmark swing is CritPt: 31.4% for Claude Sonnet 5.5 and 25.7% for Gemini 3 Deep Think.

Side by side

Claude Sonnet 5.5Gemini 3 Deep Think
ProviderAnthropicGoogle
Noometry Index61.958.3
Released2026-09-282026-02-12
WeightsProprietaryProprietary
Context window1M—
Max output128K—
Input $ / M tokens$2—
Output $ / M tokens$10—
Results tracked323

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Category by category

Coding Not comparable

Claude Sonnet 5.5: 67.3 (#6), Gemini 3 Deep Think: —

BenchmarkClaude Sonnet 5.5Gemini 3 Deep Think
FrontierCode52.1%—
CursorBench55.5%—
LMArena WebDev1774—
FrontierSWE61.9%—
SciCode61%—
LMArena Coding1513—
ALE-Bench1,819—

Agentic & Tool Use Not comparable

Claude Sonnet 5.5: 45.0 (#16), Gemini 3 Deep Think: —

BenchmarkClaude Sonnet 5.5Gemini 3 Deep Think
APEX-Agents75.5%—

Reasoning Gemini 3 Deep Think leads

Claude Sonnet 5.5: 54.0 (#28), Gemini 3 Deep Think: 70.2 (#14)

BenchmarkClaude Sonnet 5.5Gemini 3 Deep Think
CritPt31.4%25.7%
ARC-AGI-2—84.6%
NYT Connections (extended)80.5%—
ARC-AGI-1—96%
LMArena Hard Prompts1495—
Mystery Game Puzzles65%—
Epoch Capabilities Index165.03—

Math Not comparable

Claude Sonnet 5.5: 87.9 (#6), Gemini 3 Deep Think: —

BenchmarkClaude Sonnet 5.5Gemini 3 Deep Think
FrontierMath (Tiers 1-3)88.8%—
FrontierMath Tier 480.5%—
OTIS Mock AIME 2024-2025100%—
ProofBench100%—
LMArena Math1510—
FrontierMath Erdős2.9%—

Knowledge Not comparable

Claude Sonnet 5.5: 66.0 (#12), Gemini 3 Deep Think: —

BenchmarkClaude Sonnet 5.5Gemini 3 Deep Think
GPQA Diamond95.6%—
SimpleQA Verified46.5%—
LMArena Expert1540—

Multimodal Not comparable

Claude Sonnet 5.5: 51.5 (#6), Gemini 3 Deep Think: —

BenchmarkClaude Sonnet 5.5Gemini 3 Deep Think
LMArena Vision1289—
Furniture Assembly75%—

Multilingual Not comparable

Claude Sonnet 5.5: 55.3 (#30), Gemini 3 Deep Think: —

BenchmarkClaude Sonnet 5.5Gemini 3 Deep Think
LMArena Non-English1452—
LMArena Chinese1522—
LMArena Russian1451—

Instruction Following Not comparable

Claude Sonnet 5.5: 78.3 (#11), Gemini 3 Deep Think: —

BenchmarkClaude Sonnet 5.5Gemini 3 Deep Think
LMArena Instruction Following1495—

Long Context Not comparable

Claude Sonnet 5.5: 45.9 (#28), Gemini 3 Deep Think: —

BenchmarkClaude Sonnet 5.5Gemini 3 Deep Think
LMArena Longer Query1498—

Writing & Preference Not comparable

Claude Sonnet 5.5: 66.0 (#40), Gemini 3 Deep Think: —

BenchmarkClaude Sonnet 5.5Gemini 3 Deep Think
LMArena Text1471—
LMArena Creative Writing1465—
LMArena Multi-Turn1474—

Frequently asked questions

Is Claude Sonnet 5.5 better than Gemini 3 Deep Think?

Claude Sonnet 5.5 has enough public results to be ranked (#10); Gemini 3 Deep Think does not yet, so treat this comparison as directional.

How many benchmarks do Claude Sonnet 5.5 and Gemini 3 Deep Think share?

1 benchmark has published results for both models. Claude Sonnet 5.5 has 32 scored results on Noometry and Gemini 3 Deep Think has 3.

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