Noometry

Model comparison

GPT-5.5 Instant vs o1

GPT-5.5 Instant is the stronger model overall, scoring 42.7 to 40.9 on the Noometry Index.

Last verified . 23 shared benchmarks.

GPT-5.5 Instant OpenAI

42.7

Rank #110 Confirmed

o1 OpenAI

40.9

Rank #143 Confirmed

Summary

  • They share 23 benchmarks with published results for both. GPT-5.5 Instant scores higher in 4 categories and o1 in 5 categories; 8 gaps are clear of the uncertainty.
  • The widest gap is in math, where o1 leads 36.1 to 26.5.
  • The biggest single-benchmark swing is FrontierMath (Tiers 1-3): 26.3% for GPT-5.5 Instant and 14.7% for o1.

Side by side

GPT-5.5 Instanto1
ProviderOpenAIOpenAI
Noometry Index42.740.9
Released2026-05-052024-09-12
WeightsProprietaryProprietary
Context window—200K
Max output—100K
Input $ / M tokens—$15
Output $ / M tokens—$60
Results tracked2752

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Category by category

Coding o1 leads

GPT-5.5 Instant: 44.3 (#74), o1: 46.1 (#70)

BenchmarkGPT-5.5 Instanto1
LMArena Coding14331367
Aider Polyglot—61.7%
SciCode48.6%—
WeirdML—47.6%
LiveBench Coding—69.7%
CadEval—56%
HumanEval+—89%
MBPP+—80.2%

Agentic & Tool Use Not comparable

GPT-5.5 Instant: —, o1: 24.6 (#117)

BenchmarkGPT-5.5 Instanto1
Cybench—10%
METR Time Horizons—51.1%

Reasoning o1 leads

GPT-5.5 Instant: 24.9 (#155), o1: 27.9 (#111)

BenchmarkGPT-5.5 Instanto1
Chess Puzzles12%15%
LMArena Hard Prompts14261371
Epoch Capabilities Index142.52141.91
SimpleBench—41.7%
ARC-AGI-1—30.7%
CritPt0%—
EnigmaEval—5.7%
LiveBench Reasoning—91.6%
DTBench—74.7%
LiveBench Data Analysis—65.5%
LMCA—22.3%
LiveBench—75.7%

Math o1 leads

GPT-5.5 Instant: 26.5 (#259), o1: 36.1 (#175)

BenchmarkGPT-5.5 Instanto1
FrontierMath (Tiers 1-3)26.3%14.7%
OTIS Mock AIME 2024-202568.1%73.3%
LMArena Math14201388
FrontierMath Tier 42.4%—
LiveBench Math—80.3%
MATH Level 5—94.7%
FrontierMath (Feb 2025 set)—9.3%

Knowledge GPT-5.5 Instant leads

GPT-5.5 Instant: 48.9 (#74), o1: 41.5 (#110)

BenchmarkGPT-5.5 Instanto1
GPQA Diamond82.5%76.8%
LMArena Expert14091361
Humanity's Last Exam—8%
SimpleQA Verified—41.1%
Confabulations—11.7%

Multimodal GPT-5.5 Instant leads

GPT-5.5 Instant: 40.0 (#52), o1: 34.2 (#93)

BenchmarkGPT-5.5 Instanto1
LMArena Vision12501168
GeoBench—80%
VPCT—37%
LMArena Document1403—
SpatialViz-Bench—41.4%

Multilingual GPT-5.5 Instant leads

GPT-5.5 Instant: 52.8 (#80), o1: 48.6 (#142)

BenchmarkGPT-5.5 Instanto1
LMArena Non-English14171358
LMArena Chinese14561394
LMArena French14281344
LMArena German14111337
LMArena Japanese14081346
LMArena Korean13921396
LMArena Russian14311356
LMArena Spanish14291345

Instruction Following Too close to call

GPT-5.5 Instant: 74.2 (#100), o1: 74.8 (#86)

BenchmarkGPT-5.5 Instanto1
LMArena Instruction Following14061367
LiveBench Instruction Following—81.5%

Long Context o1 leads

GPT-5.5 Instant: 43.4 (#96), o1: 50.3 (#9)

BenchmarkGPT-5.5 Instanto1
LMArena Longer Query14221378
Fiction.LiveBench—83.3%

Writing & Preference GPT-5.5 Instant leads

GPT-5.5 Instant: 61.8 (#85), o1: 55.6 (#144)

BenchmarkGPT-5.5 Instanto1
LMArena Text14191366
LMArena Creative Writing14191348
LMArena Multi-Turn14331369
Short-Story Creative Writing—70.2%
LiveBench Language—65.4%

Frequently asked questions

Is GPT-5.5 Instant better than o1?

GPT-5.5 Instant is the stronger model overall, scoring 42.7 to 40.9 on the Noometry Index.

Is GPT-5.5 Instant or o1 better for coding?

o1 scores higher on coding benchmarks: 46.1 versus 44.3 in the Noometry coding category.

How many benchmarks do GPT-5.5 Instant and o1 share?

23 benchmarks have published results for both models. GPT-5.5 Instant has 27 scored results on Noometry and o1 has 52.

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