tokevenGPTvsGrok
GPT 5.6 Sol 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 5.6 Sol
FlagshipGrok 4.20 Reasoning
Mid-tierInput $/MTok
$4.00
$1.25
Output $/MTok
$20.00
$2.50
Cache discount
90% off
84% off
Context
922K
1,000K
Quality
Task confidence comparison
Confidence score from zero to one hundred by task type, where higher is better.
Code Generation
94
vs
0
Code Review
92
vs
0
Summarization
90
vs
0
Q&A
91
vs
0
Extraction
88
vs
0
Reasoning
96
vs
0
Classification
86
vs
0
Creative Writing
92
vs
0
GPT 5.6 Sol
Grok 4.20 Reasoning
Guidance
When to use GPT 5.6 Sol vs Grok 4.20 Reasoning
Choose GPT 5.6 Sol when...
- Similar performance; consider provider preference or ecosystem fit.
Choose Grok 4.20 Reasoning when...
- -Cost matters: 69% cheaper on input tokens
- -You need a larger context window (1,000K vs 922K)
At scale
Cost at scale
Estimated cost assuming a seventy percent input and thirty percent output token split.
GPT 5.6 Sol
Grok 4.20 Reasoning
100K tokens
$0.88
$0.16Cheaper
1M tokens
$14.60
$3.25Cheaper
10M tokens
$146.00
$32.50Cheaper
FAQ
When should I use GPT 5.6 Sol instead of Grok 4.20 Reasoning?
GPT 5.6 Sol 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 5.6 Sol?
Yes. Grok 4.20 Reasoning input costs $1.25/MTok vs $4.00/MTok for GPT 5.6 Sol, saving 69% on input.
What are the context window sizes for GPT 5.6 Sol and Grok 4.20 Reasoning?
GPT 5.6 Sol has a 922K 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 5.6 Sol 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.