Noometry

Model comparison

Claude Opus 5.5 vs Phi 3 Medium 4k Instruct

Claude Opus 5.5 is the stronger model overall, scoring 68.5 to 32.4 on the Noometry Index.

Last verified . 11 shared benchmarks.

Claude Opus 5.5 Anthropic

68.5

Rank #3 Confirmed

Phi 3 Medium 4k Instruct Microsoft

32.4

Rank #246 Confirmed

Summary

  • They share 11 benchmarks with published results for both. Claude Opus 5.5 scores higher in 8 categories and Phi 3 Medium 4k Instruct in 0 categories; 8 gaps are clear of the uncertainty.
  • The widest gap is in math, where Claude Opus 5.5 leads 92.4 to 30.9.
  • Phi 3 Medium 4k Instruct has downloadable open weights; the other is API-only.

Side by side

Claude Opus 5.5Phi 3 Medium 4k Instruct
ProviderAnthropicMicrosoft
Noometry Index68.532.4
Released2026-09-22—
WeightsProprietaryOpen
Context window1M—
Max output128K—
Input $ / M tokens$4—
Output $ / M tokens$20—
Results tracked3517

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Category by category

Coding Claude Opus 5.5 leads

Claude Opus 5.5: 71.4 (#1), Phi 3 Medium 4k Instruct: 32.3 (#263)

BenchmarkClaude Opus 5.5Phi 3 Medium 4k Instruct
LMArena Coding15451130
FrontierCode54.4%—
CursorBench57.8%—
LMArena WebDev1820—
FrontierSWE62.3%—
SciCode66.9%—
MirrorCode77.4%—

Agentic & Tool Use Not comparable

Claude Opus 5.5: 45.3 (#13), Phi 3 Medium 4k Instruct: —

BenchmarkClaude Opus 5.5Phi 3 Medium 4k Instruct
APEX-Agents73.5%—
GDP.pdf30.6%—

Reasoning Claude Opus 5.5 leads

Claude Opus 5.5: 79.5 (#2), Phi 3 Medium 4k Instruct: 20.8 (#214)

BenchmarkClaude Opus 5.5Phi 3 Medium 4k Instruct
LMArena Hard Prompts15451127
ARC-AGI-292.5%—
NYT Connections (extended)88.5%—
ARC-AGI-197.5%—
CritPt31.7%—
EBR-Bench71.4%—
Mystery Game Puzzles71%—
DTBench98.9%—
LMCA68.2%—

Math Claude Opus 5.5 leads

Claude Opus 5.5: 92.4 (#2), Phi 3 Medium 4k Instruct: 30.9 (#202)

BenchmarkClaude Opus 5.5Phi 3 Medium 4k Instruct
FrontierMath (Tiers 1-3)91.2%—
FrontierMath Tier 495%—
OTIS Mock AIME 2024-2025100%—
ProofBench100%—
LMArena Math—1173

Knowledge Claude Opus 5.5 leads

Claude Opus 5.5: 66.6 (#9), Phi 3 Medium 4k Instruct: 29.6 (#226)

BenchmarkClaude Opus 5.5Phi 3 Medium 4k Instruct
LMArena Expert15641108
GPQA Diamond90.6%—
SimpleQA Verified72.2%—

Multimodal Not comparable

Claude Opus 5.5: 56.5 (#2), Phi 3 Medium 4k Instruct: —

BenchmarkClaude Opus 5.5Phi 3 Medium 4k Instruct
Furniture Assembly83.3%—

Multilingual Claude Opus 5.5 leads

Claude Opus 5.5: 59.8 (#1), Phi 3 Medium 4k Instruct: 30.8 (#258)

BenchmarkClaude Opus 5.5Phi 3 Medium 4k Instruct
LMArena Non-English15131094
LMArena Chinese15721108
LMArena Russian15321145
LMArena French—1109
LMArena German—1101
LMArena Japanese—1042
LMArena Korean—954
LMArena Spanish—1095

Instruction Following Claude Opus 5.5 leads

Claude Opus 5.5: 80.1 (#2), Phi 3 Medium 4k Instruct: 57.8 (#263)

BenchmarkClaude Opus 5.5Phi 3 Medium 4k Instruct
LMArena Instruction Following15351114

Long Context Claude Opus 5.5 leads

Claude Opus 5.5: 47.3 (#18), Phi 3 Medium 4k Instruct: 33.9 (#250)

BenchmarkClaude Opus 5.5Phi 3 Medium 4k Instruct
LMArena Longer Query15401120

Writing & Preference Claude Opus 5.5 leads

Claude Opus 5.5: 78.7 (#3), Phi 3 Medium 4k Instruct: 34.3 (#267)

BenchmarkClaude Opus 5.5Phi 3 Medium 4k Instruct
LMArena Text15181138
LMArena Creative Writing15381106
LMArena Multi-Turn15201088
EQ-Bench Creative Writing2050—

Frequently asked questions

Is Claude Opus 5.5 better than Phi 3 Medium 4k Instruct?

Claude Opus 5.5 is the stronger model overall, scoring 68.5 to 32.4 on the Noometry Index.

Is Claude Opus 5.5 or Phi 3 Medium 4k Instruct better for coding?

Claude Opus 5.5 scores higher on coding benchmarks: 71.4 versus 32.3 in the Noometry coding category.

How many benchmarks do Claude Opus 5.5 and Phi 3 Medium 4k Instruct share?

11 benchmarks have published results for both models. Claude Opus 5.5 has 35 scored results on Noometry and Phi 3 Medium 4k Instruct has 17.

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