Noometry

Model comparison

Claude Opus 5.5 vs Gemini 1.5 Flash 8B

Claude Opus 5.5 is the stronger model overall, scoring 68.5 to 29.7 on the Noometry Index.

Last verified . 14 shared benchmarks.

Claude Opus 5.5 Anthropic

68.5

Rank #3 Confirmed

Gemini 1.5 Flash 8B Google

29.7

Rank #292 Confirmed

Summary

  • They share 14 benchmarks with published results for both. Claude Opus 5.5 scores higher in 9 categories and Gemini 1.5 Flash 8B in 0 categories; 9 gaps are clear of the uncertainty.
  • The widest gap is in math, where Claude Opus 5.5 leads 92.4 to 13.3.
  • The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 100% for Claude Opus 5.5 and 4.6% for Gemini 1.5 Flash 8B.

Side by side

Claude Opus 5.5Gemini 1.5 Flash 8B
ProviderAnthropicGoogle
Noometry Index68.529.7
Released2026-09-222024-10-03
WeightsProprietaryProprietary
Context window1M—
Max output128K—
Input $ / M tokens$4—
Output $ / M tokens$20—
Results tracked3521

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Category by category

Coding Claude Opus 5.5 leads

Claude Opus 5.5: 71.4 (#1), Gemini 1.5 Flash 8B: 34.9 (#221)

BenchmarkClaude Opus 5.5Gemini 1.5 Flash 8B
LMArena Coding15451218
FrontierCode54.4%—
CursorBench57.8%—
LMArena WebDev1820—
FrontierSWE62.3%—
SciCode66.9%—
MirrorCode77.4%—

Agentic & Tool Use Not comparable

Claude Opus 5.5: 45.3 (#13), Gemini 1.5 Flash 8B: —

BenchmarkClaude Opus 5.5Gemini 1.5 Flash 8B
APEX-Agents73.5%—
GDP.pdf30.6%—

Reasoning Claude Opus 5.5 leads

Claude Opus 5.5: 79.5 (#2), Gemini 1.5 Flash 8B: 19.2 (#242)

BenchmarkClaude Opus 5.5Gemini 1.5 Flash 8B
LMArena Hard Prompts15451210
DTBench98.9%50%
ARC-AGI-292.5%—
NYT Connections (extended)88.5%—
ARC-AGI-197.5%—
CritPt31.7%—
EBR-Bench71.4%—
Mystery Game Puzzles71%—
LMCA68.2%—

Math Claude Opus 5.5 leads

Claude Opus 5.5: 92.4 (#2), Gemini 1.5 Flash 8B: 13.3 (#296)

BenchmarkClaude Opus 5.5Gemini 1.5 Flash 8B
OTIS Mock AIME 2024-2025100%4.6%
FrontierMath (Tiers 1-3)91.2%—
FrontierMath Tier 495%—
ProofBench100%—
LMArena Math—1207

Knowledge Claude Opus 5.5 leads

Claude Opus 5.5: 66.6 (#9), Gemini 1.5 Flash 8B: 16.0 (#285)

BenchmarkClaude Opus 5.5Gemini 1.5 Flash 8B
GPQA Diamond90.6%33%
LMArena Expert15641185
SimpleQA Verified72.2%—

Multimodal Claude Opus 5.5 leads

Claude Opus 5.5: 56.5 (#2), Gemini 1.5 Flash 8B: 27.6 (#110)

BenchmarkClaude Opus 5.5Gemini 1.5 Flash 8B
LMArena Vision—1044
Furniture Assembly83.3%—

Multilingual Claude Opus 5.5 leads

Claude Opus 5.5: 59.8 (#1), Gemini 1.5 Flash 8B: 38.6 (#224)

BenchmarkClaude Opus 5.5Gemini 1.5 Flash 8B
LMArena Non-English15131215
LMArena Chinese15721231
LMArena Russian15321236
LMArena French—1233
LMArena German—1206
LMArena Japanese—1150
LMArena Korean—1140
LMArena Spanish—1212

Instruction Following Claude Opus 5.5 leads

Claude Opus 5.5: 80.1 (#2), Gemini 1.5 Flash 8B: 63.1 (#231)

BenchmarkClaude Opus 5.5Gemini 1.5 Flash 8B
LMArena Instruction Following15351199

Long Context Claude Opus 5.5 leads

Claude Opus 5.5: 47.3 (#18), Gemini 1.5 Flash 8B: 36.9 (#220)

BenchmarkClaude Opus 5.5Gemini 1.5 Flash 8B
LMArena Longer Query15401219

Writing & Preference Claude Opus 5.5 leads

Claude Opus 5.5: 78.7 (#3), Gemini 1.5 Flash 8B: 43.0 (#227)

BenchmarkClaude Opus 5.5Gemini 1.5 Flash 8B
LMArena Text15181226
LMArena Creative Writing15381218
LMArena Multi-Turn15201185
EQ-Bench Creative Writing2050—

Frequently asked questions

Is Claude Opus 5.5 better than Gemini 1.5 Flash 8B?

Claude Opus 5.5 is the stronger model overall, scoring 68.5 to 29.7 on the Noometry Index.

Is Claude Opus 5.5 or Gemini 1.5 Flash 8B better for coding?

Claude Opus 5.5 scores higher on coding benchmarks: 71.4 versus 34.9 in the Noometry coding category.

How many benchmarks do Claude Opus 5.5 and Gemini 1.5 Flash 8B share?

14 benchmarks have published results for both models. Claude Opus 5.5 has 35 scored results on Noometry and Gemini 1.5 Flash 8B has 21.

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