tokevenGPTvsGPT
GPT 4o Mini vs GPT 5.1
Side-by-side comparison of pricing, task quality, and projected cost at higher scale.
Pricing
Side-by-side pricing
GPT 4o Mini
Fast / BudgetGPT 5.1
Mid-tierInput $/MTok
$0.15
$1.25
Output $/MTok
$0.60
$10.00
Cache discount
50% off
90% off
Context
128K
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 4o Mini
GPT 5.1
Guidance
When to use GPT 4o Mini vs GPT 5.1
Choose GPT 4o Mini when...
- -Cost matters: 88% cheaper on input tokens
Choose GPT 5.1 when...
- -You need a larger context window (272K vs 128K)
- 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 4o Mini
GPT 5.1
100K tokens
$0.03Cheaper
$0.39
1M tokens
$0.28Cheaper
$3.88
10M tokens
$2.85Cheaper
$38.75
FAQ
When should I use GPT 4o Mini instead of GPT 5.1?
GPT 4o Mini and GPT 5.1 perform similarly across all tracked tasks. Pick based on pricing and provider preference.
Is GPT 5.1 cheaper than GPT 4o Mini?
GPT 5.1 input costs $1.25/MTok, which is 733% more than GPT 4o Mini at $0.15/MTok.
What are the context window sizes for GPT 4o Mini and GPT 5.1?
GPT 4o Mini has a 128K 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 4o Mini 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.