tokevenGPTvsGemini
GPT 5 Pro vs Gemini 3.5 Flash-Lite
Side-by-side comparison of pricing, task quality, and projected cost at higher scale.
Pricing
Side-by-side pricing
GPT 5 Pro
FlagshipGemini 3.5 Flash-Lite
Fast / BudgetInput $/MTok
$15.00
$0.30
Output $/MTok
$120.00
$2.50
Cache discount
0% off
90% off
Context
400K
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
55
Code Review
0
vs
52
Summarization
0
vs
79
Q&A
0
vs
78
Extraction
0
vs
83
Reasoning
0
vs
50
Classification
0
vs
85
Creative Writing
0
vs
45
GPT 5 Pro
Gemini 3.5 Flash-Lite
Guidance
When to use GPT 5 Pro vs Gemini 3.5 Flash-Lite
Choose GPT 5 Pro when...
- Similar performance; consider provider preference or ecosystem fit.
Choose Gemini 3.5 Flash-Lite when...
- -Cost matters: 98% cheaper on input tokens
- -You need a larger context window (1,048.576K vs 400K)
At scale
Cost at scale
Estimated cost assuming a seventy percent input and thirty percent output token split.
GPT 5 Pro
Gemini 3.5 Flash-Lite
100K tokens
$4.65
$0.10Cheaper
1M tokens
$46.50
$0.96Cheaper
10M tokens
$465.00
$9.60Cheaper
FAQ
When should I use GPT 5 Pro instead of Gemini 3.5 Flash-Lite?
GPT 5 Pro and Gemini 3.5 Flash-Lite perform similarly across all tracked tasks. Pick based on pricing and provider preference.
Is Gemini 3.5 Flash-Lite cheaper than GPT 5 Pro?
Yes. Gemini 3.5 Flash-Lite input costs $0.30/MTok vs $15.00/MTok for GPT 5 Pro, saving 98% on input.
What are the context window sizes for GPT 5 Pro and Gemini 3.5 Flash-Lite?
GPT 5 Pro has a 400K token context window. Gemini 3.5 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 GPT 5 Pro and Gemini 3.5 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.