tokevenGPTvsGPT
GPT 5.1 vs o1
Side-by-side comparison of pricing, task quality, and projected cost at higher scale.
Pricing
Side-by-side pricing
GPT 5.1
Mid-tiero1
FlagshipInput $/MTok
$1.25
$15.00
Output $/MTok
$10.00
$60.00
Cache discount
90% off
50% off
Context
272K
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 5.1
o1
Guidance
When to use GPT 5.1 vs o1
Choose GPT 5.1 when...
- -Cost matters: 92% cheaper on input tokens
- -You need a larger context window (272K vs 200K)
Choose o1 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 5.1
o1
100K tokens
$0.39Cheaper
$2.85
1M tokens
$3.88Cheaper
$28.50
10M tokens
$38.75Cheaper
$285.00
FAQ
When should I use GPT 5.1 instead of o1?
GPT 5.1 and o1 perform similarly across all tracked tasks. Pick based on pricing and provider preference.
Is o1 cheaper than GPT 5.1?
o1 input costs $15.00/MTok, which is 1100% more than GPT 5.1 at $1.25/MTok.
What are the context window sizes for GPT 5.1 and o1?
GPT 5.1 has a 272K 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 5.1 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.