Noometry

Model comparison

GPT-5.5 Instant vs Phi-4

GPT-5.5 Instant is the stronger model overall, scoring 42.7 to 31.2 on the Noometry Index.

Last verified . 21 shared benchmarks.

GPT-5.5 Instant OpenAI

42.7

Rank #110 Confirmed

Phi-4 Microsoft

31.2

Rank #279 Confirmed

Summary

  • They share 21 benchmarks with published results for both. GPT-5.5 Instant scores higher in 8 categories and Phi-4 in 0 categories; 8 gaps are clear of the uncertainty.
  • The widest gap is in writing & preference, where GPT-5.5 Instant leads 61.8 to 40.5.
  • The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 68.1% for GPT-5.5 Instant and 13.8% for Phi-4.
  • Phi-4 has downloadable open weights; the other is API-only.

Side by side

GPT-5.5 InstantPhi-4
ProviderOpenAIMicrosoft
Noometry Index42.731.2
Released2026-05-052024-12-11
WeightsProprietaryOpen
Context window—128K
Max output—4K
Input $ / M tokens—$0.07
Output $ / M tokens—$0.14
Results tracked2737

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Category by category

Coding GPT-5.5 Instant leads

GPT-5.5 Instant: 44.3 (#74), Phi-4: 34.4 (#239)

BenchmarkGPT-5.5 InstantPhi-4
LMArena Coding14331231
SciCode48.6%—
BigCodeBench Instruct—45.5%
LiveBench Coding—30.7%
BigCodeBench Complete—55.4%

Agentic & Tool Use Not comparable

GPT-5.5 Instant: —, Phi-4: 22.8 (#128)

BenchmarkGPT-5.5 InstantPhi-4
Berkeley Function Calling Leaderboard—28.8%
BALROG—11.6%

Reasoning GPT-5.5 Instant leads

GPT-5.5 Instant: 24.9 (#155), Phi-4: 17.7 (#291)

BenchmarkGPT-5.5 InstantPhi-4
Chess Puzzles12%1%
LMArena Hard Prompts14261220
Epoch Capabilities Index142.52130.42
CritPt0%—
LiveBench Reasoning—47.8%
LiveBench Data Analysis—45.2%
LiveBench—41.6%

Math GPT-5.5 Instant leads

GPT-5.5 Instant: 26.5 (#259), Phi-4: 20.8 (#285)

BenchmarkGPT-5.5 InstantPhi-4
OTIS Mock AIME 2024-202568.1%13.8%
LMArena Math14201246
FrontierMath (Tiers 1-3)26.3%—
FrontierMath Tier 42.4%—
LiveBench Math—42%
MATH Level 5—64.9%

Knowledge GPT-5.5 Instant leads

GPT-5.5 Instant: 48.9 (#74), Phi-4: 32.6 (#209)

BenchmarkGPT-5.5 InstantPhi-4
GPQA Diamond82.5%56.1%
LMArena Expert14091203
Confabulations—29.4%
Vectara Hallucination Rate—3.7%
MMLU—84.8%

Multimodal Not comparable

GPT-5.5 Instant: 40.0 (#52), Phi-4: —

BenchmarkGPT-5.5 InstantPhi-4
LMArena Vision1250—
LMArena Document1403—

Multilingual GPT-5.5 Instant leads

GPT-5.5 Instant: 52.8 (#80), Phi-4: 37.2 (#237)

BenchmarkGPT-5.5 InstantPhi-4
LMArena Non-English14171197
LMArena Chinese14561212
LMArena French14281224
LMArena German14111222
LMArena Japanese14081158
LMArena Korean13921151
LMArena Russian14311209
LMArena Spanish14291234

Instruction Following GPT-5.5 Instant leads

GPT-5.5 Instant: 74.2 (#100), Phi-4: 60.4 (#251)

BenchmarkGPT-5.5 InstantPhi-4
LMArena Instruction Following14061201
LiveBench Instruction Following—58.4%

Long Context GPT-5.5 Instant leads

GPT-5.5 Instant: 43.4 (#96), Phi-4: 36.9 (#226)

BenchmarkGPT-5.5 InstantPhi-4
LMArena Longer Query14221217

Writing & Preference GPT-5.5 Instant leads

GPT-5.5 Instant: 61.8 (#85), Phi-4: 40.5 (#244)

BenchmarkGPT-5.5 InstantPhi-4
LMArena Text14191217
LMArena Creative Writing14191182
LMArena Multi-Turn14331206
Short-Story Creative Writing—62.6%
LiveBench Language—25.6%

Frequently asked questions

Is GPT-5.5 Instant better than Phi-4?

GPT-5.5 Instant is the stronger model overall, scoring 42.7 to 31.2 on the Noometry Index.

Is GPT-5.5 Instant or Phi-4 better for coding?

GPT-5.5 Instant scores higher on coding benchmarks: 44.3 versus 34.4 in the Noometry coding category.

How many benchmarks do GPT-5.5 Instant and Phi-4 share?

21 benchmarks have published results for both models. GPT-5.5 Instant has 27 scored results on Noometry and Phi-4 has 37.

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