Noometry

Model comparison

GPT-5.5 Instant vs Grok 4.6

Grok 4.6 is the stronger model overall, scoring 56.9 to 42.7 on the Noometry Index.

Last verified . 27 shared benchmarks.

GPT-5.5 Instant OpenAI

42.7

Rank #110 Confirmed

Grok 4.6 xAI

56.9

Rank #21 Confirmed

Summary

  • They share 27 benchmarks with published results for both. GPT-5.5 Instant scores higher in 0 categories and Grok 4.6 in 9 categories; 7 gaps are clear of the uncertainty.
  • The widest gap is in math, where Grok 4.6 leads 67.0 to 26.5.
  • The biggest single-benchmark swing is FrontierMath (Tiers 1-3): 26.3% for GPT-5.5 Instant and 66% for Grok 4.6.

Side by side

GPT-5.5 InstantGrok 4.6
ProviderOpenAIxAI
Noometry Index42.756.9
Released2026-05-052026-08-12
WeightsProprietaryProprietary
Context window—500K
Max output—500K
Input $ / M tokens—$2
Output $ / M tokens—$6
Results tracked2749

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Category by category

Coding Grok 4.6 leads

GPT-5.5 Instant: 44.3 (#74), Grok 4.6: 58.5 (#16)

BenchmarkGPT-5.5 InstantGrok 4.6
SciCode48.6%56.5%
LMArena Coding14331465
DeepSWE—67.5%
FrontierCode—48%
CursorBench—41.4%
LMArena WebDev—1617
FrontierSWE—25.3%
WeirdML—67.3%
ALE-Bench—1,508

Agentic & Tool Use Not comparable

GPT-5.5 Instant: —, Grok 4.6: 39.4 (#27)

BenchmarkGPT-5.5 InstantGrok 4.6
APEX-Agents—65.3%
GDP.pdf—17.2%
Vending-Bench 2—9,047

Reasoning Grok 4.6 leads

GPT-5.5 Instant: 24.9 (#155), Grok 4.6: 61.4 (#20)

BenchmarkGPT-5.5 InstantGrok 4.6
CritPt0%19.7%
Chess Puzzles12%40%
LMArena Hard Prompts14261447
Epoch Capabilities Index142.52156.44
ARC-AGI-2—67.1%
SimpleBench—75.9%
NYT Connections (extended)—80%
ARC-AGI-1—87.5%
EBR-Bench—30.5%
Mystery Game Puzzles—34%
DTBench—97.3%
LMCA—48.5%

Math Grok 4.6 leads

GPT-5.5 Instant: 26.5 (#259), Grok 4.6: 67.0 (#24)

BenchmarkGPT-5.5 InstantGrok 4.6
FrontierMath (Tiers 1-3)26.3%66%
FrontierMath Tier 42.4%31.7%
OTIS Mock AIME 2024-202568.1%99.2%
LMArena Math14201423
ProofBench—51%

Knowledge Grok 4.6 leads

GPT-5.5 Instant: 48.9 (#74), Grok 4.6: 63.3 (#20)

BenchmarkGPT-5.5 InstantGrok 4.6
GPQA Diamond82.5%94%
LMArena Expert14091467
SimpleQA Verified—49.3%

Multimodal Grok 4.6 leads

GPT-5.5 Instant: 40.0 (#52), Grok 4.6: 43.6 (#23)

BenchmarkGPT-5.5 InstantGrok 4.6
LMArena Vision12501263
LMArena Document14031452
Blueprint-Bench 2—33.2%
Furniture Assembly—40%

Multilingual Too close to call

GPT-5.5 Instant: 52.8 (#80), Grok 4.6: 53.0 (#74)

BenchmarkGPT-5.5 InstantGrok 4.6
LMArena Non-English14171420
LMArena Chinese14561480
LMArena French14281461
LMArena German14111431
LMArena Japanese14081376
LMArena Korean13921397
LMArena Russian14311422
LMArena Spanish14291404

Instruction Following Grok 4.6 leads

GPT-5.5 Instant: 74.2 (#100), Grok 4.6: 75.4 (#63)

BenchmarkGPT-5.5 InstantGrok 4.6
LMArena Instruction Following14061431

Long Context Grok 4.6 leads

GPT-5.5 Instant: 43.4 (#96), Grok 4.6: 44.5 (#66)

BenchmarkGPT-5.5 InstantGrok 4.6
LMArena Longer Query14221454

Writing & Preference Too close to call

GPT-5.5 Instant: 61.8 (#85), Grok 4.6: 62.3 (#80)

BenchmarkGPT-5.5 InstantGrok 4.6
LMArena Text14191428
LMArena Creative Writing14191428
LMArena Multi-Turn14331425

Frequently asked questions

Is GPT-5.5 Instant better than Grok 4.6?

Grok 4.6 is the stronger model overall, scoring 56.9 to 42.7 on the Noometry Index.

Is GPT-5.5 Instant or Grok 4.6 better for coding?

Grok 4.6 scores higher on coding benchmarks: 58.5 versus 44.3 in the Noometry coding category.

How many benchmarks do GPT-5.5 Instant and Grok 4.6 share?

27 benchmarks have published results for both models. GPT-5.5 Instant has 27 scored results on Noometry and Grok 4.6 has 49.

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