tokevenGPTvsGPT
GPT 5 Pro vs GPT 5.1
Side-by-side comparison of pricing, task quality, and projected cost at higher scale.
Pricing
Side-by-side pricing
GPT 5 Pro
FlagshipGPT 5.1
Mid-tierInput $/MTok
$15.00
$1.25
Output $/MTok
$120.00
$10.00
Cache discount
0% off
90% off
Context
400K
272K
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
GPT 5.1
Guidance
When to use GPT 5 Pro vs GPT 5.1
Choose GPT 5 Pro when...
- -You need a larger context window (400K vs 272K)
- Similar performance; consider provider preference or ecosystem fit.
Choose GPT 5.1 when...
- -Cost matters: 92% cheaper on input tokens
At scale
Cost at scale
Estimated cost assuming a seventy percent input and thirty percent output token split.
GPT 5 Pro
GPT 5.1
100K tokens
$4.65
$0.39Cheaper
1M tokens
$46.50
$3.88Cheaper
10M tokens
$465.00
$38.75Cheaper
FAQ
When should I use GPT 5 Pro instead of GPT 5.1?
GPT 5 Pro and GPT 5.1 perform similarly across all tracked tasks. Pick based on pricing and provider preference.
Is GPT 5.1 cheaper than GPT 5 Pro?
Yes. GPT 5.1 input costs $1.25/MTok vs $15.00/MTok for GPT 5 Pro, saving 92% on input.
What are the context window sizes for GPT 5 Pro and GPT 5.1?
GPT 5 Pro has a 400K token context window. GPT 5.1 has a 272K 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 GPT 5.1 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.