Noometry

Model comparison

GPT-5.5 Instant vs o4-mini

GPT-5.5 Instant is the stronger model overall, scoring 42.7 to 41.6 on the Noometry Index.

Last verified . 25 shared benchmarks.

GPT-5.5 Instant OpenAI

42.7

Rank #110 Confirmed

o4-mini OpenAI

41.6

Rank #132 Confirmed

Summary

  • They share 25 benchmarks with published results for both. GPT-5.5 Instant scores higher in 5 categories and o4-mini in 4 categories; 7 gaps are clear of the uncertainty.
  • The widest gap is in math, where o4-mini leads 40.8 to 26.5.
  • The biggest single-benchmark swing is Chess Puzzles: 12% for GPT-5.5 Instant and 26% for o4-mini.

Side by side

GPT-5.5 Instanto4-mini
ProviderOpenAIOpenAI
Noometry Index42.741.6
Released2026-05-052025-04-16
WeightsProprietaryProprietary
Context window—200K
Max output—100K
Input $ / M tokens—$1.10
Output $ / M tokens—$4.40
Results tracked2760

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Category by category

Coding GPT-5.5 Instant leads

GPT-5.5 Instant: 44.3 (#74), o4-mini: 40.9 (#127)

BenchmarkGPT-5.5 Instanto4-mini
LMArena Coding14331368
SWE-bench Verified (bash only)—45%
Aider Polyglot—72%
SciCode48.6%—
GSO—3.6%
WeirdML—52.6%
CadEval—62%
ALE-Bench—826.17
AlgoTune—1.72

Agentic & Tool Use Not comparable

GPT-5.5 Instant: —, o4-mini: 32.6 (#61)

BenchmarkGPT-5.5 Instanto4-mini
Berkeley Function Calling Leaderboard—53.2%
GDPval—25.3%
METR Time Horizons—63.9%

Reasoning Too close to call

GPT-5.5 Instant: 24.9 (#155), o4-mini: 24.6 (#162)

BenchmarkGPT-5.5 Instanto4-mini
CritPt0%0.6%
Chess Puzzles12%26%
LMArena Hard Prompts14261351
Epoch Capabilities Index142.52145.64
ARC-AGI-2—6.1%
SimpleBench—38.7%
Kagi LLM Benchmark—67.6%
ARC-AGI-1—58.7%
EnigmaEval—9.2%
Mystery Game Puzzles—5%
DTBench—77.6%
LMCA—26.5%
ForecastBench—61.8

Math o4-mini leads

GPT-5.5 Instant: 26.5 (#259), o4-mini: 40.8 (#89)

BenchmarkGPT-5.5 Instanto4-mini
FrontierMath (Tiers 1-3)26.3%36.1%
FrontierMath Tier 42.4%4.9%
OTIS Mock AIME 2024-202568.1%81.7%
LMArena Math14201389
Omni-MATH—72%
MATH Level 5—97.8%
FrontierMath (Feb 2025 set)—24.8%
FrontierMath Tier 4 (v1)—6.3%

Knowledge GPT-5.5 Instant leads

GPT-5.5 Instant: 48.9 (#74), o4-mini: 43.6 (#91)

BenchmarkGPT-5.5 Instanto4-mini
GPQA Diamond82.5%79.6%
LMArena Expert14091343
Humanity's Last Exam—18.1%
SimpleQA Verified—19.6%
MMLU-Pro—82%
Confabulations—15.8%
Vectara Hallucination Rate—18.6%
GPQA (HELM)—73.5%

Multimodal Too close to call

GPT-5.5 Instant: 40.0 (#52), o4-mini: 40.2 (#49)

BenchmarkGPT-5.5 Instanto4-mini
LMArena Vision12501194
GeoBench—64%
VPCT—57.5%
LMArena Document1403—

Multilingual GPT-5.5 Instant leads

GPT-5.5 Instant: 52.8 (#80), o4-mini: 47.0 (#154)

BenchmarkGPT-5.5 Instanto4-mini
LMArena Non-English14171337
LMArena Chinese14561354
LMArena French14281364
LMArena German14111336
LMArena Japanese14081308
LMArena Korean13921312
LMArena Russian14311334
LMArena Spanish14291347

Instruction Following o4-mini leads

GPT-5.5 Instant: 74.2 (#100), o4-mini: 75.2 (#68)

BenchmarkGPT-5.5 Instanto4-mini
LMArena Instruction Following14061321
IFEval—92.8%

Long Context o4-mini leads

GPT-5.5 Instant: 43.4 (#96), o4-mini: 45.5 (#33)

BenchmarkGPT-5.5 Instanto4-mini
LMArena Longer Query14221315
Fiction.LiveBench—77.8%

Writing & Preference GPT-5.5 Instant leads

GPT-5.5 Instant: 61.8 (#85), o4-mini: 54.0 (#152)

BenchmarkGPT-5.5 Instanto4-mini
LMArena Text14191353
LMArena Creative Writing14191294
LMArena Multi-Turn14331350
Short-Story Creative Writing—75%
WildBench—85.4%

Frequently asked questions

Is GPT-5.5 Instant better than o4-mini?

GPT-5.5 Instant is the stronger model overall, scoring 42.7 to 41.6 on the Noometry Index.

Is GPT-5.5 Instant or o4-mini better for coding?

GPT-5.5 Instant scores higher on coding benchmarks: 44.3 versus 40.9 in the Noometry coding category.

How many benchmarks do GPT-5.5 Instant and o4-mini share?

25 benchmarks have published results for both models. GPT-5.5 Instant has 27 scored results on Noometry and o4-mini has 60.

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