Compare · ModelsLive · 2 picked · head to head
Grok 3 Mini vs Grok 4 Fast
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
Grok 4 Fast wins on 5/5 benchmarks
Grok 4 Fast wins 5 of 5 shared benchmarks. Leads in reasoning · knowledge · coding.
Category leads
reasoning·Grok 4 Fastknowledge·Grok 4 Fastcoding·Grok 4 Fast
Hype vs Reality
Attention vs performance
Grok 3 Mini
#108 by perf·no signal
Grok 4 Fast
#93 by perf·no signal
Best value
Grok 4 Fast
1.2x better value than Grok 3 Mini
Grok 3 Mini
116.5 pts/$
$0.40/M
Grok 4 Fast
144.0 pts/$
$0.35/M
Vendor risk
Who is behind the model
xAI
$250.0B·Tier 1
xAI
$250.0B·Tier 1
Head to head
5 benchmarks · 2 models
Grok 3 MiniGrok 4 Fast
ARC-AGI
Grok 4 Fast leads by +32.0
ARC-AGI · the original Abstraction and Reasoning Corpus, testing whether AI can solve novel visual pattern recognition tasks without memorization.
Grok 3 Mini
16.5
Grok 4 Fast
48.5
ARC-AGI-2
Grok 4 Fast leads by +4.9
ARC-AGI-2 · the second iteration of the Abstraction and Reasoning Corpus, testing novel pattern recognition and abstract reasoning without prior training data.
Grok 3 Mini
0.4
Grok 4 Fast
5.3
Fiction.LiveBench
Grok 4 Fast leads by +27.7
Fiction.LiveBench · a continuously updated benchmark using recently published fiction to test reading comprehension and reasoning, preventing data contamination.
Grok 3 Mini
66.7
Grok 4 Fast
94.4
Lech Mazur Writing
Grok 4 Fast leads by +7.6
Lech Mazur Writing · evaluates creative writing ability, assessing prose quality, narrative coherence, and stylistic sophistication.
Grok 3 Mini
73.5
Grok 4 Fast
81.1
WeirdML
Grok 4 Fast leads by +0.3
WeirdML · tests models on unusual and adversarial machine learning tasks that require creative problem-solving beyond standard patterns.
Grok 3 Mini
42.6
Grok 4 Fast
42.9
Full benchmark table
| Benchmark | Grok 3 Mini | 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. | 16.5 | 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. | 0.4 | 5.3 |
Fiction.LiveBench Fiction.LiveBench · a continuously updated benchmark using recently published fiction to test reading comprehension and reasoning, preventing data contamination. | 66.7 | 94.4 |
Lech Mazur Writing Lech Mazur Writing · evaluates creative writing ability, assessing prose quality, narrative coherence, and stylistic sophistication. | 73.5 | 81.1 |
WeirdML WeirdML · tests models on unusual and adversarial machine learning tasks that require creative problem-solving beyond standard patterns. | 42.6 | 42.9 |
Pricing · per 1M tokens · projected $/mo at 10M tokens
| Model | Input | Output | Context | Projected $/mo |
|---|---|---|---|---|
| Grok 3 Mini | $0.30 | $0.50 | 131K tokens (~66 books) | $3.50 |
| Grok 4 Fast | $0.20 | $0.50 | 2.0M tokens (~1,000 books) | $2.75 |