Noometry

Model comparison

GPT-5.5 Instant vs Grok-3 mini

GPT-5.5 Instant is the stronger model overall, scoring 42.5 to 41.0 on the Noometry Index.

Last verified . 20 shared benchmarks.

GPT-5.5 Instant OpenAI

42.5

Rank #99 Confirmed

Grok-3 mini xAI

41.0

Rank #130 Confirmed

Summary

  • They share 20 benchmarks with published results for both. GPT-5.5 Instant scores higher in 6 categories and Grok-3 mini in 2 categories; 8 gaps are clear of the uncertainty.
  • The widest gap is in math, where Grok-3 mini leads 40.3 to 26.1.
  • The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 68.1% for GPT-5.5 Instant and 77.8% for Grok-3 mini.

Side by side

GPT-5.5 InstantGrok-3 mini
ProviderOpenAIxAI
Noometry Index42.541.0
Released2026-05-052025-04-09
WeightsProprietaryProprietary
Context window——
Max output——
Input $ / M tokens——
Output $ / M tokens——
Results tracked2735

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Category by category

Coding GPT-5.5 Instant leads

GPT-5.5 Instant: 43.7 (#73), Grok-3 mini: 40.4 (#126)

BenchmarkGPT-5.5 InstantGrok-3 mini
LMArena Coding14331380
Aider Polyglot—49.3%
SciCode48.6%—
WeirdML—42.6%

Reasoning GPT-5.5 Instant leads

GPT-5.5 Instant: 24.2 (#149), Grok-3 mini: 13.8 (#323)

BenchmarkGPT-5.5 InstantGrok-3 mini
LMArena Hard Prompts14261374
Epoch Capabilities Index142.48140.35
ARC-AGI-2—0.4%
Kagi LLM Benchmark—61.3%
ARC-AGI-1—16.5%
CritPt0%—
Chess Puzzles12%—

Math Grok-3 mini leads

GPT-5.5 Instant: 26.1 (#241), Grok-3 mini: 40.3 (#78)

BenchmarkGPT-5.5 InstantGrok-3 mini
OTIS Mock AIME 2024-202568.1%77.8%
LMArena Math14201386
FrontierMath (Tiers 1-3)26.3%—
FrontierMath Tier 42.4%—
Omni-MATH—31.8%
MATH Level 5—90.9%
FrontierMath (Feb 2025 set)—5.9%

Knowledge GPT-5.5 Instant leads

GPT-5.5 Instant: 48.9 (#68), Grok-3 mini: 46.3 (#75)

BenchmarkGPT-5.5 InstantGrok-3 mini
GPQA Diamond82.5%76.3%
LMArena Expert14091395
MMLU-Pro—79.9%
Confabulations—10.8%
GPQA (HELM)—67.5%

Multimodal Not comparable

GPT-5.5 Instant: 39.3 (#48), Grok-3 mini: —

BenchmarkGPT-5.5 InstantGrok-3 mini
LMArena Vision1250—
LMArena Document1403—

Multilingual GPT-5.5 Instant leads

GPT-5.5 Instant: 53.0 (#76), Grok-3 mini: 48.3 (#141)

BenchmarkGPT-5.5 InstantGrok-3 mini
LMArena Non-English14171352
LMArena Chinese14571387
LMArena French14281357
LMArena German14101350
LMArena Japanese14081343
LMArena Korean13931336
LMArena Russian14301352
LMArena Spanish14301379

Instruction Following Grok-3 mini leads

GPT-5.5 Instant: 74.4 (#94), Grok-3 mini: 78.7 (#8)

BenchmarkGPT-5.5 InstantGrok-3 mini
LMArena Instruction Following14071356
IFEval—95.1%

Long Context GPT-5.5 Instant leads

GPT-5.5 Instant: 43.4 (#92), Grok-3 mini: 41.0 (#142)

BenchmarkGPT-5.5 InstantGrok-3 mini
LMArena Longer Query14221372
Fiction.LiveBench—66.7%

Writing & Preference GPT-5.5 Instant leads

GPT-5.5 Instant: 62.0 (#81), Grok-3 mini: 52.7 (#163)

BenchmarkGPT-5.5 InstantGrok-3 mini
LMArena Text14191370
LMArena Creative Writing14201342
LMArena Multi-Turn14341355
Short-Story Creative Writing—73.5%
WildBench—65.1%

Frequently asked questions

Is GPT-5.5 Instant better than Grok-3 mini?

GPT-5.5 Instant is the stronger model overall, scoring 42.5 to 41.0 on the Noometry Index.

Is GPT-5.5 Instant or Grok-3 mini better for coding?

GPT-5.5 Instant scores higher on coding benchmarks: 43.7 versus 40.4 in the Noometry coding category.

How many benchmarks do GPT-5.5 Instant and Grok-3 mini share?

20 benchmarks have published results for both models. GPT-5.5 Instant has 27 scored results on Noometry and Grok-3 mini has 35.

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