tokevenGPTvsGemini
o3 vs Gemini 3 Flash
Side-by-side comparison of pricing, task quality, and projected cost at higher scale.
Pricing
Side-by-side pricing
o3
Mid-tierGemini 3 Flash
Fast / BudgetInput $/MTok
$2.00
$0.50
Output $/MTok
$8.00
$3.00
Cache discount
75% off
90% off
Context
200K
1,048.576K
Quality
Task confidence comparison
Confidence score from zero to one hundred by task type, where higher is better.
Code Generation
0
vs
65
Code Review
0
vs
62
Summarization
0
vs
83
Q&A
0
vs
82
Extraction
0
vs
86
Reasoning
0
vs
58
Classification
0
vs
88
Creative Writing
0
vs
52
o3
Gemini 3 Flash
Guidance
When to use o3 vs Gemini 3 Flash
Choose o3 when...
- Similar performance; consider provider preference or ecosystem fit.
Choose Gemini 3 Flash when...
- -Cost matters: 75% cheaper on input tokens
- -You need a larger context window (1,048.576K vs 200K)
At scale
Cost at scale
Estimated cost assuming a seventy percent input and thirty percent output token split.
o3
Gemini 3 Flash
100K tokens
$0.38
$0.13Cheaper
1M tokens
$3.80
$1.25Cheaper
10M tokens
$38.00
$12.50Cheaper
FAQ
When should I use o3 instead of Gemini 3 Flash?
o3 and Gemini 3 Flash perform similarly across all tracked tasks. Pick based on pricing and provider preference.
Is Gemini 3 Flash cheaper than o3?
Yes. Gemini 3 Flash input costs $0.50/MTok vs $2.00/MTok for o3, saving 75% on input.
What are the context window sizes for o3 and Gemini 3 Flash?
o3 has a 200K token context window. Gemini 3 Flash has a 1,048.576K 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 o3 and Gemini 3 Flash 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.