tokevenGPTvsGrok
GPT 4o vs Grok 4.20 Reasoning
Side-by-side comparison of pricing, task quality, and projected cost at higher scale.
Pricing
Side-by-side pricing
GPT 4o
Mid-tierGrok 4.20 Reasoning
Mid-tierInput $/MTok
$2.50
$1.25
Output $/MTok
$10.00
$2.50
Cache discount
50% off
84% off
Context
128K
1,000K
Quality
Task confidence comparison
Confidence score from zero to one hundred by task type, where higher is better.
Code Generation
0
vs
0
Code Review
0
vs
0
Summarization
0
vs
0
Q&A
0
vs
0
Extraction
0
vs
0
Reasoning
0
vs
0
Classification
0
vs
0
Creative Writing
0
vs
0
GPT 4o
Grok 4.20 Reasoning
Guidance
When to use GPT 4o vs Grok 4.20 Reasoning
Choose GPT 4o when...
- Similar performance; consider provider preference or ecosystem fit.
Choose Grok 4.20 Reasoning when...
- -Cost matters: 50% cheaper on input tokens
- -You need a larger context window (1,000K vs 128K)
At scale
Cost at scale
Estimated cost assuming a seventy percent input and thirty percent output token split.
GPT 4o
Grok 4.20 Reasoning
100K tokens
$0.47
$0.16Cheaper
1M tokens
$4.75
$3.25Cheaper
10M tokens
$47.50
$32.50Cheaper
FAQ
When should I use GPT 4o instead of Grok 4.20 Reasoning?
GPT 4o and Grok 4.20 Reasoning perform similarly across all tracked tasks. Pick based on pricing and provider preference.
Is Grok 4.20 Reasoning cheaper than GPT 4o?
Yes. Grok 4.20 Reasoning input costs $1.25/MTok vs $2.50/MTok for GPT 4o, saving 50% on input.
What are the context window sizes for GPT 4o and Grok 4.20 Reasoning?
GPT 4o has a 128K token context window. Grok 4.20 Reasoning has a 1,000K token context window.
Go deeper on either model
Per-call cost calculators, provider lineups, and price history for both models on this page.
Other comparisons
How GPT 4o and Grok 4.20 Reasoning stack up against the rest of the field.
Track your real costs
Comparisons show estimated costs at list price. The dashboard reveals your real spend and savings.