tokevenGPTvsGPT
GPT 5 Nano vs o3
Side-by-side comparison of pricing, task quality, and projected cost at higher scale.
Pricing
Side-by-side pricing
GPT 5 Nano
Fast / Budgeto3
Mid-tierInput $/MTok
$0.05
$2.00
Output $/MTok
$0.40
$8.00
Cache discount
90% off
75% 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 Nano
o3
Guidance
When to use GPT 5 Nano vs o3
Choose GPT 5 Nano when...
- -Cost matters: 98% cheaper on input tokens
- -You need a larger context window (272K vs 200K)
Choose o3 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 Nano
o3
100K tokens
$0.02Cheaper
$0.38
1M tokens
$0.15Cheaper
$3.80
10M tokens
$1.55Cheaper
$38.00
FAQ
When should I use GPT 5 Nano instead of o3?
GPT 5 Nano and o3 perform similarly across all tracked tasks. Pick based on pricing and provider preference.
Is o3 cheaper than GPT 5 Nano?
o3 input costs $2.00/MTok, which is 3900% more than GPT 5 Nano at $0.05/MTok.
What are the context window sizes for GPT 5 Nano and o3?
GPT 5 Nano has a 272K token context window. o3 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 Nano and o3 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.