tokevenGPTvsGrok
GPT 5.6 Luna vs Grok 4.3
Side-by-side comparison of pricing, task quality, and projected cost at higher scale.
Pricing
Side-by-side pricing
GPT 5.6 Luna
Fast / BudgetGrok 4.3
Mid-tierInput $/MTok
$0.20
$1.25
Output $/MTok
$1.20
$2.50
Cache discount
90% off
84% off
Context
922K
1M
Quality
Task confidence comparison
Confidence score from zero to one hundred by task type, where higher is better.
Code Generation
62
vs
39
Code Review
68
vs
0
Summarization
57
vs
60
Q&A
85
vs
0
Extraction
74
vs
70
Reasoning
86
vs
71
Classification
91
vs
0
Creative Writing
69
vs
71
GPT 5.6 Luna
Grok 4.3
Guidance
When to use GPT 5.6 Luna vs Grok 4.3
Choose GPT 5.6 Luna when...
- -You need strong reasoning (confidence 86 vs 71)
- -You need strong extraction (confidence 74 vs 70)
- -You need strong code generation (confidence 62 vs 39)
- -Cost matters: 84% cheaper on input tokens
Choose Grok 4.3 when...
- -You need strong creative writing (confidence 71 vs 69)
- -You need strong summarization (confidence 60 vs 57)
- -You need a larger context window (1M vs 922K)
At scale
Cost at scale
Estimated cost assuming a seventy percent input and thirty percent output token split.
GPT 5.6 Luna
Grok 4.3
100K tokens
$0.05Cheaper
$0.16
1M tokens
$0.82Cheaper
$3.25
10M tokens
$8.20Cheaper
$32.50
FAQ
When should I use GPT 5.6 Luna instead of Grok 4.3?
GPT 5.6 Luna outperforms Grok 4.3 for Code Generation, Extraction, Reasoning. It costs $0.20/$1.20 per million tokens (input/output).
Is Grok 4.3 cheaper than GPT 5.6 Luna?
Grok 4.3 input costs $1.25/MTok, which is 525% more than GPT 5.6 Luna at $0.20/MTok.
What are the context window sizes for GPT 5.6 Luna and Grok 4.3?
GPT 5.6 Luna has a 922K token context window. Grok 4.3 has a 1M 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 Luna and Grok 4.3 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.