tokevenGPTvsGPT
GPT 5.5 Pro vs o1
Side-by-side comparison of pricing, task quality, and projected cost at higher scale.
Pricing
Side-by-side pricing
GPT 5.5 Pro
Flagshipo1
FlagshipInput $/MTok
$30.00
$15.00
Output $/MTok
$180.00
$60.00
Cache discount
0% off
50% 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
o1
Guidance
When to use GPT 5.5 Pro vs o1
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 o1 when...
- -Cost matters: 50% 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
o1
100K tokens
$7.50
$2.85Cheaper
1M tokens
$123.00
$28.50Cheaper
10M tokens
$1230.00
$285.00Cheaper
FAQ
When should I use GPT 5.5 Pro instead of o1?
GPT 5.5 Pro and o1 perform similarly across all tracked tasks. Pick based on pricing and provider preference.
Is o1 cheaper than GPT 5.5 Pro?
Yes. o1 input costs $15.00/MTok vs $30.00/MTok for GPT 5.5 Pro, saving 50% on input.
What are the context window sizes for GPT 5.5 Pro and o1?
GPT 5.5 Pro has a 1,050K token context window. o1 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 o1 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.