Noometry

Model comparison

GPT-5.5 Instant vs Grok-2 (Dec 2024)

GPT-5.5 Instant is the stronger model overall, scoring 42.7 to 33.7 on the Noometry Index.

Last verified . 20 shared benchmarks.

GPT-5.5 Instant OpenAI

42.7

Rank #110 Confirmed

Grok-2 (Dec 2024) xAI

33.7

Rank #239 Confirmed

Summary

  • They share 20 benchmarks with published results for both. GPT-5.5 Instant scores higher in 8 categories and Grok-2 (Dec 2024) in 0 categories; 8 gaps are clear of the uncertainty.
  • The widest gap is in knowledge, where GPT-5.5 Instant leads 48.9 to 29.8.
  • The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 68.1% for GPT-5.5 Instant and 11.5% for Grok-2 (Dec 2024).

Side by side

GPT-5.5 InstantGrok-2 (Dec 2024)
ProviderOpenAIxAI
Noometry Index42.733.7
Released2026-05-052024-08-13
WeightsProprietaryProprietary
Context window——
Max output——
Input $ / M tokens——
Output $ / M tokens——
Results tracked2734

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Category by category

Coding GPT-5.5 Instant leads

GPT-5.5 Instant: 44.3 (#74), Grok-2 (Dec 2024): 33.3 (#258)

BenchmarkGPT-5.5 InstantGrok-2 (Dec 2024)
LMArena Coding14331287
SciCode48.6%—
WeirdML—22.2%
LiveBench Coding—46.4%

Reasoning GPT-5.5 Instant leads

GPT-5.5 Instant: 24.9 (#155), Grok-2 (Dec 2024): 16.9 (#299)

BenchmarkGPT-5.5 InstantGrok-2 (Dec 2024)
LMArena Hard Prompts14261272
Epoch Capabilities Index142.52130.48
SimpleBench—22.7%
CritPt0%—
Chess Puzzles12%—
LiveBench Reasoning—54.8%
DTBench—65.2%
LiveBench Data Analysis—54.5%
LiveBench—54.3%

Math GPT-5.5 Instant leads

GPT-5.5 Instant: 26.5 (#259), Grok-2 (Dec 2024): 20.8 (#284)

BenchmarkGPT-5.5 InstantGrok-2 (Dec 2024)
OTIS Mock AIME 2024-202568.1%11.5%
LMArena Math14201283
FrontierMath (Tiers 1-3)26.3%—
FrontierMath Tier 42.4%—
LiveBench Math—54.9%
MATH Level 5—63.5%
FrontierMath (Feb 2025 set)—0.7%

Knowledge GPT-5.5 Instant leads

GPT-5.5 Instant: 48.9 (#74), Grok-2 (Dec 2024): 29.8 (#233)

BenchmarkGPT-5.5 InstantGrok-2 (Dec 2024)
GPQA Diamond82.5%53.8%
LMArena Expert14091254
Confabulations—20.1%

Multimodal Not comparable

GPT-5.5 Instant: 40.0 (#52), Grok-2 (Dec 2024): —

BenchmarkGPT-5.5 InstantGrok-2 (Dec 2024)
LMArena Vision1250—
LMArena Document1403—

Multilingual GPT-5.5 Instant leads

GPT-5.5 Instant: 52.8 (#80), Grok-2 (Dec 2024): 43.1 (#188)

BenchmarkGPT-5.5 InstantGrok-2 (Dec 2024)
LMArena Non-English14171282
LMArena Chinese14561289
LMArena French14281318
LMArena German14111287
LMArena Japanese14081244
LMArena Korean13921237
LMArena Russian14311286
LMArena Spanish14291281

Instruction Following GPT-5.5 Instant leads

GPT-5.5 Instant: 74.2 (#100), Grok-2 (Dec 2024): 66.9 (#202)

BenchmarkGPT-5.5 InstantGrok-2 (Dec 2024)
LMArena Instruction Following14061270
LiveBench Instruction Following—69.6%

Long Context GPT-5.5 Instant leads

GPT-5.5 Instant: 43.4 (#96), Grok-2 (Dec 2024): 38.8 (#190)

BenchmarkGPT-5.5 InstantGrok-2 (Dec 2024)
LMArena Longer Query14221276

Writing & Preference GPT-5.5 Instant leads

GPT-5.5 Instant: 61.8 (#85), Grok-2 (Dec 2024): 48.6 (#198)

BenchmarkGPT-5.5 InstantGrok-2 (Dec 2024)
LMArena Text14191305
LMArena Creative Writing14191284
LMArena Multi-Turn14331290
Short-Story Creative Writing—63.6%
LiveBench Language—45.6%

Frequently asked questions

Is GPT-5.5 Instant better than Grok-2 (Dec 2024)?

GPT-5.5 Instant is the stronger model overall, scoring 42.7 to 33.7 on the Noometry Index.

Is GPT-5.5 Instant or Grok-2 (Dec 2024) better for coding?

GPT-5.5 Instant scores higher on coding benchmarks: 44.3 versus 33.3 in the Noometry coding category.

How many benchmarks do GPT-5.5 Instant and Grok-2 (Dec 2024) share?

20 benchmarks have published results for both models. GPT-5.5 Instant has 27 scored results on Noometry and Grok-2 (Dec 2024) has 34.

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