Noometry

Model comparison

Claude Opus 5.5 vs Phi-4 Mini

Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 30.9 on the Noometry Index. Phi-4 Mini costs 61× less per token, which makes it the better buy when Claude Opus 5.5's lead doesn't matter for your workload.

Last verified . 2 shared benchmarks.

Claude Opus 5.5 Anthropic

68.6

Rank #3 Confirmed

Phi-4 Mini Microsoft

30.9

Rank #283 Reported

Summary

  • They share 2 benchmarks with published results for both. Claude Opus 5.5 scores higher in 3 categories and Phi-4 Mini in 0 categories; 3 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Claude Opus 5.5 leads 80.2 to 22.4.
  • The biggest single-benchmark swing is SciCode: 66.9% for Claude Opus 5.5 and 10.8% for Phi-4 Mini.
  • Phi-4 Mini is cheaper at $0.075 / $0.30 per million input/output tokens, against $4 / $20 for Claude Opus 5.5.
  • Claude Opus 5.5 accepts more context: 1M tokens versus 128K.
  • Phi-4 Mini has downloadable open weights; the other is API-only.

Side by side

Claude Opus 5.5Phi-4 Mini
ProviderAnthropicMicrosoft
Noometry Index68.630.9
Released2026-09-222024-12-11
WeightsProprietaryOpen
Context window1M128K
Max output128K4K
Input $ / M tokens$4$0.075
Output $ / M tokens$20$0.30
Results tracked443

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Category by category

Coding Claude Opus 5.5 leads

Claude Opus 5.5: 71.9 (#3), Phi-4 Mini: 28.1 (#317)

BenchmarkClaude Opus 5.5Phi-4 Mini
SciCode66.9%10.8%
FrontierCode54.6%—
CursorBench57.8%—
LMArena WebDev1813—
FrontierSWE62.3%—
LMArena Coding1547—
MirrorCode77.4%—
ALE-Bench2,147—

Agentic & Tool Use Not comparable

Claude Opus 5.5: 45.3 (#15), Phi-4 Mini: —

BenchmarkClaude Opus 5.5Phi-4 Mini
APEX-Agents73.5%—
GDP.pdf30.6%—
Vending-Bench 29,235—

Reasoning Claude Opus 5.5 leads

Claude Opus 5.5: 80.2 (#3), Phi-4 Mini: 22.4 (#195)

BenchmarkClaude Opus 5.5Phi-4 Mini
CritPt31.7%0%
ARC-AGI-293.3%—
NYT Connections (extended)88.5%—
ARC-AGI-198.5%—
EBR-Bench71.4%—
LMArena Hard Prompts1535—
Mystery Game Puzzles71%—
DTBench98.9%—
LMCA68.2%—
Epoch Capabilities Index167.33—

Math Not comparable

Claude Opus 5.5: 91.8 (#3), Phi-4 Mini: —

BenchmarkClaude Opus 5.5Phi-4 Mini
FrontierMath (Tiers 1-3)91.2%—
FrontierMath Tier 495%—
OTIS Mock AIME 2024-2025100%—
ProofBench100%—
LMArena Math1506—
FrontierMath Erdős2.9%—

Knowledge Claude Opus 5.5 leads

Claude Opus 5.5: 66.4 (#10), Phi-4 Mini: 25.3 (#262)

BenchmarkClaude Opus 5.5Phi-4 Mini
GPQA Diamond90.6%—
SimpleQA Verified72.2%—
Vectara Hallucination Rate—23.5%
LMArena Expert1547—

Multimodal Not comparable

Claude Opus 5.5: 57.8 (#1), Phi-4 Mini: —

BenchmarkClaude Opus 5.5Phi-4 Mini
LMArena Vision1321—
Blueprint-Bench 251.2%—
Furniture Assembly83.3%—

Multilingual Not comparable

Claude Opus 5.5: 59.1 (#2), Phi-4 Mini: —

BenchmarkClaude Opus 5.5Phi-4 Mini
LMArena Non-English1507—
LMArena Chinese1588—
LMArena French1514—
LMArena Russian1520—
LMArena Spanish1507—

Instruction Following Not comparable

Claude Opus 5.5: 80.0 (#3), Phi-4 Mini: —

BenchmarkClaude Opus 5.5Phi-4 Mini
LMArena Instruction Following1537—

Long Context Not comparable

Claude Opus 5.5: 47.1 (#19), Phi-4 Mini: —

BenchmarkClaude Opus 5.5Phi-4 Mini
LMArena Longer Query1532—

Writing & Preference Not comparable

Claude Opus 5.5: 78.2 (#3), Phi-4 Mini: —

BenchmarkClaude Opus 5.5Phi-4 Mini
LMArena Text1515—
LMArena Creative Writing1533—
EQ-Bench Creative Writing2050—
LMArena Multi-Turn1499—

Frequently asked questions

Is Claude Opus 5.5 better than Phi-4 Mini?

Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 30.9 on the Noometry Index. Phi-4 Mini costs 61× less per token, which makes it the better buy when Claude Opus 5.5's lead doesn't matter for your workload.

Which is cheaper, Claude Opus 5.5 or Phi-4 Mini?

Phi-4 Mini is cheaper. It lists at $0.075 per million input tokens and $0.30 per million output tokens; Claude Opus 5.5 lists at $4 and $20.

Is Claude Opus 5.5 or Phi-4 Mini better for coding?

Claude Opus 5.5 scores higher on coding benchmarks: 71.9 versus 28.1 in the Noometry coding category.

Which has the bigger context window?

Claude Opus 5.5 does, with 1M tokens against 128K.

How many benchmarks do Claude Opus 5.5 and Phi-4 Mini share?

2 benchmarks have published results for both models. Claude Opus 5.5 has 44 scored results on Noometry and Phi-4 Mini has 3.

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