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GPT 5.5 Pro vs o4 Mini
Side-by-side comparison of pricing, task quality, and projected cost at higher scale.
Pricing
Side-by-side pricing
GPT 5.5 Pro
Flagshipo4 Mini
Fast / BudgetInput $/MTok
$30.00
$1.10
Output $/MTok
$180.00
$4.40
Cache discount
0% off
75% off
Context
1,050K
200K
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 5.5 Pro
o4 Mini
Guidance
When to use GPT 5.5 Pro vs o4 Mini
Choose GPT 5.5 Pro when...
- -You need a larger context window (1,050K vs 200K)
- Similar performance; consider provider preference or ecosystem fit.
Choose o4 Mini when...
- -Cost matters: 96% cheaper on input tokens
At scale
Cost at scale
Estimated cost assuming a seventy percent input and thirty percent output token split.
GPT 5.5 Pro
o4 Mini
100K tokens
$7.50
$0.21Cheaper
1M tokens
$123.00
$2.09Cheaper
10M tokens
$1230.00
$20.90Cheaper
FAQ
When should I use GPT 5.5 Pro instead of o4 Mini?
GPT 5.5 Pro and o4 Mini perform similarly across all tracked tasks. Pick based on pricing and provider preference.
Is o4 Mini cheaper than GPT 5.5 Pro?
Yes. o4 Mini input costs $1.10/MTok vs $30.00/MTok for GPT 5.5 Pro, saving 96% on input.
What are the context window sizes for GPT 5.5 Pro and o4 Mini?
GPT 5.5 Pro has a 1,050K token context window. o4 Mini has a 200K 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 5.5 Pro and o4 Mini 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.