tokevenGPTvsGrok
GPT 5 Nano vs Grok 4.5
Side-by-side comparison of pricing, task quality, and projected cost at higher scale.
Pricing
Side-by-side pricing
GPT 5 Nano
Fast / BudgetGrok 4.5
FlagshipInput $/MTok
$0.05
$2.00
Output $/MTok
$0.40
$6.00
Cache discount
90% off
85% off
Context
272K
500K
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 5 Nano
Grok 4.5
Guidance
When to use GPT 5 Nano vs Grok 4.5
Choose GPT 5 Nano when...
- -Cost matters: 98% cheaper on input tokens
Choose Grok 4.5 when...
- -You need a larger context window (500K vs 272K)
- Similar performance; consider provider preference or ecosystem fit.
At scale
Cost at scale
Estimated cost assuming a seventy percent input and thirty percent output token split.
GPT 5 Nano
Grok 4.5
100K tokens
$0.02Cheaper
$0.32
1M tokens
$0.15Cheaper
$6.40
10M tokens
$1.55Cheaper
$64.00
FAQ
When should I use GPT 5 Nano instead of Grok 4.5?
GPT 5 Nano and Grok 4.5 perform similarly across all tracked tasks. Pick based on pricing and provider preference.
Is Grok 4.5 cheaper than GPT 5 Nano?
Grok 4.5 input costs $2.00/MTok, which is 3900% more than GPT 5 Nano at $0.05/MTok.
What are the context window sizes for GPT 5 Nano and Grok 4.5?
GPT 5 Nano has a 272K token context window. Grok 4.5 has a 500K 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 Nano and Grok 4.5 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.