tokevenGPTvsGemini
o3 Pro vs Gemini 3.1 Flash-Lite
Side-by-side comparison of pricing, task quality, and projected cost at higher scale.
Pricing
Side-by-side pricing
o3 Pro
FlagshipGemini 3.1 Flash-Lite
Fast / BudgetInput $/MTok
$20.00
$0.25
Output $/MTok
$80.00
$1.50
Cache discount
0% 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
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
o3 Pro
Gemini 3.1 Flash-Lite
Guidance
When to use o3 Pro vs Gemini 3.1 Flash-Lite
Choose o3 Pro when...
- Similar performance; consider provider preference or ecosystem fit.
Choose Gemini 3.1 Flash-Lite when...
- -Cost matters: 99% 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 Pro
Gemini 3.1 Flash-Lite
100K tokens
$3.80
$0.06Cheaper
1M tokens
$38.00
$0.63Cheaper
10M tokens
$380.00
$6.25Cheaper
FAQ
When should I use o3 Pro instead of Gemini 3.1 Flash-Lite?
o3 Pro and Gemini 3.1 Flash-Lite perform similarly across all tracked tasks. Pick based on pricing and provider preference.
Is Gemini 3.1 Flash-Lite cheaper than o3 Pro?
Yes. Gemini 3.1 Flash-Lite input costs $0.25/MTok vs $20.00/MTok for o3 Pro, saving 99% on input.
What are the context window sizes for o3 Pro and Gemini 3.1 Flash-Lite?
o3 Pro has a 200K token context window. Gemini 3.1 Flash-Lite 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 Pro and Gemini 3.1 Flash-Lite 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.