tokevenGPTvsGemini
o1 Pro vs Gemini 2.5 Flash
Side-by-side comparison of pricing, task quality, and projected cost at higher scale.
Pricing
Side-by-side pricing
o1 Pro
FlagshipGemini 2.5 Flash
Fast / BudgetInput $/MTok
$150.00
$0.30
Output $/MTok
$600.00
$2.50
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
o1 Pro
Gemini 2.5 Flash
Guidance
When to use o1 Pro vs Gemini 2.5 Flash
Choose o1 Pro when...
- Similar performance; consider provider preference or ecosystem fit.
Choose Gemini 2.5 Flash when...
- -Cost matters: 100% 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.
o1 Pro
Gemini 2.5 Flash
100K tokens
$28.50
$0.10Cheaper
1M tokens
$285.00
$0.96Cheaper
10M tokens
$2850.00
$9.60Cheaper
FAQ
When should I use o1 Pro instead of Gemini 2.5 Flash?
o1 Pro and Gemini 2.5 Flash perform similarly across all tracked tasks. Pick based on pricing and provider preference.
Is Gemini 2.5 Flash cheaper than o1 Pro?
Yes. Gemini 2.5 Flash input costs $0.30/MTok vs $150.00/MTok for o1 Pro, saving 100% on input.
What are the context window sizes for o1 Pro and Gemini 2.5 Flash?
o1 Pro has a 200K token context window. Gemini 2.5 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 o1 Pro and Gemini 2.5 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.