Noometry

Model comparison

GPT-5.2 Pro vs Grok 4.5

Grok 4.5 is the stronger model overall, scoring 55.0 to 52.3 on the Noometry Index.

Last verified . 7 shared benchmarks.

GPT-5.2 Pro OpenAI

52.3

Rank #39 Reported

Grok 4.5 xAI

55.0

Rank #25 Confirmed

Summary

  • They share 7 benchmarks with published results for both. GPT-5.2 Pro scores higher in 1 category and Grok 4.5 in 1 category; 2 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Grok 4.5 leads 56.1 to 51.5.
  • The biggest single-benchmark swing is FrontierMath Tier 4: 46% for GPT-5.2 Pro and 24.4% for Grok 4.5.
  • Grok 4.5 is cheaper at $2 / $6 per million input/output tokens, against $21 / $168 for GPT-5.2 Pro.
  • Grok 4.5 accepts more context: 500K tokens versus 400K.

Side by side

GPT-5.2 ProGrok 4.5
ProviderOpenAIxAI
Noometry Index52.355.0
Released2025-12-112026-07-08
WeightsProprietaryProprietary
Context window400K500K
Max output128K500K
Input $ / M tokens$21$2
Output $ / M tokens$168$6
Results tracked852

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Category by category

Coding Not comparable

GPT-5.2 Pro: —, Grok 4.5: 52.2 (#35)

BenchmarkGPT-5.2 ProGrok 4.5
DeepSWE—53.8%
FrontierCode—42.4%
LMArena WebDev—1553
SciCode—54.1%
WeirdML—46.4%
LMArena Coding—1474
ALE-Bench—1,309

Agentic & Tool Use Not comparable

GPT-5.2 Pro: —, Grok 4.5: 44.4 (#17)

BenchmarkGPT-5.2 ProGrok 4.5
APEX-Agents—56.2%
τ²-bench Banking—47.9%
PostTrainBench—23.4%
GBAEval—65.4%
GDP.pdf—14%
LMArena Search—1213
Vending-Bench 2—3,887

Reasoning Grok 4.5 leads

GPT-5.2 Pro: 51.5 (#33), Grok 4.5: 56.1 (#25)

BenchmarkGPT-5.2 ProGrok 4.5
ARC-AGI-254.2%52.6%
SimpleBench57.4%70%
NYT Connections (extended)79.3%79.9%
ARC-AGI-190.5%87.2%
Epoch Capabilities Index155.4153.92
Kagi LLM Benchmark—83.5%
CritPt—15.4%
Chess Puzzles—36%
LMArena Hard Prompts—1462
DTBench—96.5%
LMCA—45.2%
Surface Evolver Bench—74.4%

Math GPT-5.2 Pro leads

GPT-5.2 Pro: 65.3 (#29), Grok 4.5: 60.9 (#35)

BenchmarkGPT-5.2 ProGrok 4.5
FrontierMath (Tiers 1-3)74%57.2%
FrontierMath Tier 446%24.4%
OTIS Mock AIME 2024-2025—97.8%
ProofBench—31%
LMArena Math—1459
FrontierMath Tier 4 (v1)31.3%—

Knowledge Not comparable

GPT-5.2 Pro: —, Grok 4.5: 62.3 (#24)

BenchmarkGPT-5.2 ProGrok 4.5
GPQA Diamond—93.4%
SimpleQA Verified—48.3%
LMArena Expert—1466

Multimodal Not comparable

GPT-5.2 Pro: —, Grok 4.5: 37.6 (#72)

BenchmarkGPT-5.2 ProGrok 4.5
LMArena Vision—1288
Blueprint-Bench 2—27.3%
Furniture Assembly—22.5%
LMArena Document—1452

Multilingual Not comparable

GPT-5.2 Pro: —, Grok 4.5: 54.4 (#42)

BenchmarkGPT-5.2 ProGrok 4.5
LMArena Non-English—1440
LMArena Chinese—1496
LMArena French—1456
LMArena German—1446
LMArena Japanese—1428
LMArena Korean—1404
LMArena Russian—1448
LMArena Spanish—1450

Instruction Following Not comparable

GPT-5.2 Pro: —, Grok 4.5: 76.0 (#48)

BenchmarkGPT-5.2 ProGrok 4.5
LMArena Instruction Following—1446

Long Context Not comparable

GPT-5.2 Pro: —, Grok 4.5: 44.8 (#56)

BenchmarkGPT-5.2 ProGrok 4.5
LMArena Longer Query—1463

Writing & Preference Not comparable

GPT-5.2 Pro: —, Grok 4.5: 65.8 (#42)

BenchmarkGPT-5.2 ProGrok 4.5
LMArena Text—1448
LMArena Creative Writing—1442
EQ-Bench Creative Writing—1579
LMArena Multi-Turn—1456

Frequently asked questions

Is GPT-5.2 Pro better than Grok 4.5?

Grok 4.5 is the stronger model overall, scoring 55.0 to 52.3 on the Noometry Index.

Which is cheaper, GPT-5.2 Pro or Grok 4.5?

Grok 4.5 is cheaper. It lists at $2 per million input tokens and $6 per million output tokens; GPT-5.2 Pro lists at $21 and $168.

Which has the bigger context window?

Grok 4.5 does, with 500K tokens against 400K.

How many benchmarks do GPT-5.2 Pro and Grok 4.5 share?

7 benchmarks have published results for both models. GPT-5.2 Pro has 8 scored results on Noometry and Grok 4.5 has 52.

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