Noometry

Model comparison

GPT-5 Pro vs Grok 4.20 Multi-Agent

GPT-5 Pro and Grok 4.20 Multi-Agent score almost the same on the Noometry Index (46.4 vs 46.2), so choose on price, context window or the category you care about most.

Last verified . 0 shared benchmarks.

GPT-5 Pro OpenAI

46.4

Rank #64 Confirmed

Grok 4.20 Multi-Agent xAI

46.2

Rank #65 Confirmed

Summary

  • The widest gap is in knowledge, where GPT-5 Pro leads 56.7 to 40.4.
  • Grok 4.20 Multi-Agent is cheaper at $1.25 / $2.50 per million input/output tokens, against $15 / $120 for GPT-5 Pro.
  • Grok 4.20 Multi-Agent accepts more context: 1M tokens versus 400K.

Side by side

GPT-5 ProGrok 4.20 Multi-Agent
ProviderOpenAIxAI
Noometry Index46.446.2
Released2025-10-062026-03-09
WeightsProprietaryProprietary
Context window400K1M
Max output272K30K
Input $ / M tokens$15$1.25
Output $ / M tokens$120$2.50
Results tracked1220

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Category by category

Coding Too close to call

GPT-5 Pro: 44.0 (#80), Grok 4.20 Multi-Agent: 43.0 (#92)

BenchmarkGPT-5 ProGrok 4.20 Multi-Agent
WeirdML60.4%—
LMArena Coding—1457
AlgoTune1.31—

Agentic & Tool Use Not comparable

GPT-5 Pro: —, Grok 4.20 Multi-Agent: —

BenchmarkGPT-5 ProGrok 4.20 Multi-Agent
LMArena Search—1204

Reasoning Grok 4.20 Multi-Agent leads

GPT-5 Pro: 38.9 (#62), Grok 4.20 Multi-Agent: 43.9 (#48)

BenchmarkGPT-5 ProGrok 4.20 Multi-Agent
ARC-AGI-218.3%—
SimpleBench61.6%—
Kagi LLM Benchmark76.8%—
NYT Connections (extended)—89.6%
ARC-AGI-170.2%—
EnigmaEval18.8%—
LMArena Hard Prompts—1448
Epoch Capabilities Index150.28—

Math GPT-5 Pro leads

GPT-5 Pro: 48.5 (#63), Grok 4.20 Multi-Agent: 39.4 (#104)

BenchmarkGPT-5 ProGrok 4.20 Multi-Agent
FrontierMath (Tiers 1-3)55.8%—
FrontierMath Tier 419.5%—
LMArena Math—1442
FrontierMath Tier 4 (v1)14.6%—

Knowledge GPT-5 Pro leads

GPT-5 Pro: 56.7 (#42), Grok 4.20 Multi-Agent: 40.4 (#119)

BenchmarkGPT-5 ProGrok 4.20 Multi-Agent
Humanity's Last Exam31.6%—
LMArena Expert—1445

Multimodal Not comparable

GPT-5 Pro: —, Grok 4.20 Multi-Agent: 40.5 (#48)

BenchmarkGPT-5 ProGrok 4.20 Multi-Agent
LMArena Vision—1259

Multilingual Not comparable

GPT-5 Pro: —, Grok 4.20 Multi-Agent: 54.4 (#43)

BenchmarkGPT-5 ProGrok 4.20 Multi-Agent
LMArena Non-English—1440
LMArena Chinese—1475
LMArena French—1466
LMArena German—1456
LMArena Japanese—1405
LMArena Korean—1416
LMArena Russian—1457
LMArena Spanish—1447

Instruction Following Not comparable

GPT-5 Pro: —, Grok 4.20 Multi-Agent: 74.8 (#84)

BenchmarkGPT-5 ProGrok 4.20 Multi-Agent
LMArena Instruction Following—1420

Long Context Not comparable

GPT-5 Pro: —, Grok 4.20 Multi-Agent: 43.7 (#88)

BenchmarkGPT-5 ProGrok 4.20 Multi-Agent
LMArena Longer Query—1431

Writing & Preference Not comparable

GPT-5 Pro: —, Grok 4.20 Multi-Agent: 64.0 (#59)

BenchmarkGPT-5 ProGrok 4.20 Multi-Agent
LMArena Text—1450
LMArena Creative Writing—1436
LMArena Multi-Turn—1452

Frequently asked questions

Is GPT-5 Pro better than Grok 4.20 Multi-Agent?

GPT-5 Pro and Grok 4.20 Multi-Agent score almost the same on the Noometry Index (46.4 vs 46.2), so choose on price, context window or the category you care about most.

Which is cheaper, GPT-5 Pro or Grok 4.20 Multi-Agent?

Grok 4.20 Multi-Agent is cheaper. It lists at $1.25 per million input tokens and $2.50 per million output tokens; GPT-5 Pro lists at $15 and $120.

Is GPT-5 Pro or Grok 4.20 Multi-Agent better for coding?

They score almost the same on coding (44.0 vs 43.0); test both on your own repository before choosing.

Which has the bigger context window?

Grok 4.20 Multi-Agent does, with 1M tokens against 400K.

How many benchmarks do GPT-5 Pro and Grok 4.20 Multi-Agent share?

0 benchmarks have published results for both models. GPT-5 Pro has 12 scored results on Noometry and Grok 4.20 Multi-Agent has 20.

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