tokevenGPTvsGrok
GPT 5 Pro 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 Pro
FlagshipGrok 4.5
FlagshipInput $/MTok
$15.00
$2.00
Output $/MTok
$120.00
$6.00
Cache discount
0% off
85% off
Context
400K
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 Pro
Grok 4.5
Guidance
When to use GPT 5 Pro vs Grok 4.5
Choose GPT 5 Pro when...
- Similar performance; consider provider preference or ecosystem fit.
Choose Grok 4.5 when...
- -Cost matters: 87% cheaper on input tokens
- -You need a larger context window (500K vs 400K)
At scale
Cost at scale
Estimated cost assuming a seventy percent input and thirty percent output token split.
GPT 5 Pro
Grok 4.5
100K tokens
$4.65
$0.32Cheaper
1M tokens
$46.50
$6.40Cheaper
10M tokens
$465.00
$64.00Cheaper
FAQ
When should I use GPT 5 Pro instead of Grok 4.5?
GPT 5 Pro 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 Pro?
Yes. Grok 4.5 input costs $2.00/MTok vs $15.00/MTok for GPT 5 Pro, saving 87% on input.
What are the context window sizes for GPT 5 Pro and Grok 4.5?
GPT 5 Pro has a 400K 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 Pro 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.