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GPT 5 Pro vs o3
Side-by-side comparison of pricing, task quality, and projected cost at higher scale.
Pricing
Side-by-side pricing
GPT 5 Pro
Flagshipo3
Mid-tierInput $/MTok
$15.00
$2.00
Output $/MTok
$120.00
$8.00
Cache discount
0% off
75% off
Context
400K
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 Pro
o3
Guidance
When to use GPT 5 Pro vs o3
Choose GPT 5 Pro when...
- -You need a larger context window (400K vs 200K)
- Similar performance; consider provider preference or ecosystem fit.
Choose o3 when...
- -Cost matters: 87% cheaper on input tokens
At scale
Cost at scale
Estimated cost assuming a seventy percent input and thirty percent output token split.
GPT 5 Pro
o3
100K tokens
$4.65
$0.38Cheaper
1M tokens
$46.50
$3.80Cheaper
10M tokens
$465.00
$38.00Cheaper
FAQ
When should I use GPT 5 Pro instead of o3?
GPT 5 Pro and o3 perform similarly across all tracked tasks. Pick based on pricing and provider preference.
Is o3 cheaper than GPT 5 Pro?
Yes. o3 input costs $2.00/MTok vs $15.00/MTok for GPT 5 Pro, saving 87% on input.
What are the context window sizes for GPT 5 Pro and o3?
GPT 5 Pro has a 400K 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 Pro 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.