tokevenGPTvsGemini
GPT 5.5 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 5.5
FlagshipGemini 3.1 Pro
Mid-tierInput $/MTok
$5.00
$2.00
Output $/MTok
$30.00
$12.00
Cache discount
90% off
75% off
Context
128K
1,000K
Quality
Task confidence comparison
Confidence score from zero to one hundred by task type, where higher is better.
Code Generation
91
vs
86
Code Review
90
vs
84
Summarization
89
vs
87
Q&A
90
vs
87
Extraction
87
vs
85
Reasoning
95
vs
90
Classification
85
vs
86
Creative Writing
91
vs
84
GPT 5.5
Gemini 3.1 Pro
Guidance
When to use GPT 5.5 vs Gemini 3.1 Pro
Choose GPT 5.5 when...
- -You need strong reasoning (confidence 95 vs 90)
- -You need strong code generation (confidence 91 vs 86)
- -You need strong creative writing (confidence 91 vs 84)
- -You need strong code review (confidence 90 vs 84)
Choose Gemini 3.1 Pro when...
- -You need strong classification (confidence 86 vs 85)
- -Cost matters: 60% cheaper on input tokens
- -You need a larger context window (1,000K vs 128K)
At scale
Cost at scale
Estimated cost assuming a seventy percent input and thirty percent output token split.
GPT 5.5
Gemini 3.1 Pro
100K tokens
$1.25
$0.50Cheaper
1M tokens
$12.50
$5.00Cheaper
10M tokens
$125.00
$50.00Cheaper
FAQ
When should I use GPT 5.5 instead of Gemini 3.1 Pro?
GPT 5.5 outperforms Gemini 3.1 Pro for Reasoning, Code Generation, Code Review. It costs $5.00/$30.00 per million tokens (input/output).
Is Gemini 3.1 Pro cheaper than GPT 5.5?
Yes. Gemini 3.1 Pro input costs $2.00/MTok vs $5.00/MTok for GPT 5.5, saving 60% on input.
What are the context window sizes for GPT 5.5 and Gemini 3.1 Pro?
GPT 5.5 has a 128K token context window. Gemini 3.1 Pro has a 1,000K token context window.
Track your real costs
Comparisons show estimated costs at list price. The dashboard reveals your real spend and savings.