tokevenGPTvsGPT
GPT 5.5 vs o1 Pro
Side-by-side comparison of pricing, task quality, and projected cost at higher scale.
Pricing
Side-by-side pricing
GPT 5.5
Flagshipo1 Pro
FlagshipInput $/MTok
$5.00
$150.00
Output $/MTok
$30.00
$600.00
Cache discount
90% off
0% 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
91
vs
0
Code Review
90
vs
0
Summarization
89
vs
0
Q&A
90
vs
0
Extraction
87
vs
0
Reasoning
95
vs
0
Classification
85
vs
0
Creative Writing
91
vs
0
GPT 5.5
o1 Pro
Guidance
When to use GPT 5.5 vs o1 Pro
Choose GPT 5.5 when...
- -Cost matters: 97% cheaper on input tokens
- -You need a larger context window (1,050K vs 200K)
Choose o1 Pro when...
- 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 5.5
o1 Pro
100K tokens
$1.25Cheaper
$28.50
1M tokens
$20.50Cheaper
$285.00
10M tokens
$205.00Cheaper
$2850.00
FAQ
When should I use GPT 5.5 instead of o1 Pro?
GPT 5.5 and o1 Pro perform similarly across all tracked tasks. Pick based on pricing and provider preference.
Is o1 Pro cheaper than GPT 5.5?
o1 Pro input costs $150.00/MTok, which is 2900% more than GPT 5.5 at $5.00/MTok.
What are the context window sizes for GPT 5.5 and o1 Pro?
GPT 5.5 has a 1,050K token context window. o1 Pro 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 and o1 Pro 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.