tokevenGPTvsGemini
GPT 5.1 vs Gemini 3.1 Pro
Side-by-side comparison of pricing, task quality, and projected cost at higher scale.
Pricing
Side-by-side pricing
GPT 5.1
Mid-tierGemini 3.1 Pro
Mid-tierInput $/MTok
$1.25
$2.00
Output $/MTok
$10.00
$12.00
Cache discount
90% off
90% off
Context
272K
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
86
Code Review
0
vs
84
Summarization
0
vs
87
Q&A
0
vs
87
Extraction
0
vs
85
Reasoning
0
vs
90
Classification
0
vs
86
Creative Writing
0
vs
84
GPT 5.1
Gemini 3.1 Pro
Guidance
When to use GPT 5.1 vs Gemini 3.1 Pro
Choose GPT 5.1 when...
- -Cost matters: 38% cheaper on input tokens
Choose Gemini 3.1 Pro when...
- -You need a larger context window (1,048.576K vs 272K)
- Similar performance; consider provider preference or ecosystem fit.
At scale
Cost at scale
Estimated cost assuming a seventy percent input and thirty percent output token split.
GPT 5.1
Gemini 3.1 Pro
100K tokens
$0.39Cheaper
$0.50
1M tokens
$3.88Cheaper
$8.20
10M tokens
$38.75Cheaper
$82.00
FAQ
When should I use GPT 5.1 instead of Gemini 3.1 Pro?
GPT 5.1 and Gemini 3.1 Pro perform similarly across all tracked tasks. Pick based on pricing and provider preference.
Is Gemini 3.1 Pro cheaper than GPT 5.1?
Gemini 3.1 Pro input costs $2.00/MTok, which is 60% more than GPT 5.1 at $1.25/MTok.
What are the context window sizes for GPT 5.1 and Gemini 3.1 Pro?
GPT 5.1 has a 272K token context window. Gemini 3.1 Pro 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 5.1 and Gemini 3.1 Pro 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.