Compare · ModelsLive · 2 picked · head to head
Grok 4 vs Grok 4 Fast
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
Grok 4 wins on 5/6 benchmarks
Grok 4 wins 5 of 6 shared benchmarks. Leads in reasoning · coding · knowledge.
Category leads
reasoning·Grok 4coding·Grok 4knowledge·Grok 4
Hype vs Reality
Attention vs performance
Grok 4
#73 by perf·no signal
Grok 4 Fast
#95 by perf·no signal
Best value
Grok 4 Fast
23.6x better value than Grok 4
Grok 4
6.1 pts/$
$9.00/M
Grok 4 Fast
144.0 pts/$
$0.35/M
Vendor risk
Who is behind the model
xAI
$250.0B·Tier 1
xAI
$250.0B·Tier 1
Head to head
6 benchmarks · 2 models
Grok 4Grok 4 Fast
ARC-AGI
Grok 4 leads by +18.2
ARC-AGI · the original Abstraction and Reasoning Corpus, testing whether AI can solve novel visual pattern recognition tasks without memorization.
Grok 4
66.7
Grok 4 Fast
48.5
ARC-AGI-2
Grok 4 leads by +10.7
ARC-AGI-2 · the second iteration of the Abstraction and Reasoning Corpus, testing novel pattern recognition and abstract reasoning without prior training data.
Grok 4
16.0
Grok 4 Fast
5.3
Cybench
Grok 4 leads by +13.0
Cybench · evaluates AI on real Capture-The-Flag cybersecurity challenges, testing vulnerability analysis, exploitation, and security reasoning.
Grok 4
43.0
Grok 4 Fast
30.0
Fiction.LiveBench
Fiction.LiveBench · a continuously updated benchmark using recently published fiction to test reading comprehension and reasoning, preventing data contamination.
Grok 4
94.4
Grok 4 Fast
94.4
Lech Mazur Writing
Grok 4 Fast leads by +0.5
Lech Mazur Writing · evaluates creative writing ability, assessing prose quality, narrative coherence, and stylistic sophistication.
Grok 4
80.7
Grok 4 Fast
81.1
WeirdML
Grok 4 leads by +2.9
WeirdML · tests models on unusual and adversarial machine learning tasks that require creative problem-solving beyond standard patterns.
Grok 4
45.7
Grok 4 Fast
42.9
Full benchmark table
| Benchmark | Grok 4 | Grok 4 Fast |
|---|---|---|
ARC-AGI ARC-AGI · the original Abstraction and Reasoning Corpus, testing whether AI can solve novel visual pattern recognition tasks without memorization. | 66.7 | 48.5 |
ARC-AGI-2 ARC-AGI-2 · the second iteration of the Abstraction and Reasoning Corpus, testing novel pattern recognition and abstract reasoning without prior training data. | 16.0 | 5.3 |
Cybench Cybench · evaluates AI on real Capture-The-Flag cybersecurity challenges, testing vulnerability analysis, exploitation, and security reasoning. | 43.0 | 30.0 |
Fiction.LiveBench Fiction.LiveBench · a continuously updated benchmark using recently published fiction to test reading comprehension and reasoning, preventing data contamination. | 94.4 | 94.4 |
Lech Mazur Writing Lech Mazur Writing · evaluates creative writing ability, assessing prose quality, narrative coherence, and stylistic sophistication. | 80.7 | 81.1 |
WeirdML WeirdML · tests models on unusual and adversarial machine learning tasks that require creative problem-solving beyond standard patterns. | 45.7 | 42.9 |
Pricing · per 1M tokens · projected $/mo at 10M tokens
| Model | Input | Output | Context | Projected $/mo |
|---|---|---|---|---|
| $3.00 | $15.00 | 256K tokens (~128 books) | $60.00 | |
| $0.20 | $0.50 | 2.0M tokens (~1,000 books) | $2.75 |