tokevenGPTvsGemini
GPT 5.5 vs Gemini 3.5 Flash
Side-by-side comparison of pricing, task quality, and projected cost at higher scale.
Pricing
Side-by-side pricing
GPT 5.5
FlagshipGemini 3.5 Flash
Fast / BudgetInput $/MTok
$5.00
$1.50
Output $/MTok
$30.00
$9.00
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
68
Code Review
90
vs
65
Summarization
89
vs
85
Q&A
90
vs
84
Extraction
87
vs
90
Reasoning
95
vs
60
Classification
85
vs
92
Creative Writing
91
vs
55
GPT 5.5
Gemini 3.5 Flash
Guidance
When to use GPT 5.5 vs Gemini 3.5 Flash
Choose GPT 5.5 when...
- -You need strong reasoning (confidence 95 vs 60)
- -You need strong code generation (confidence 91 vs 68)
- -You need strong creative writing (confidence 91 vs 55)
- -You need strong code review (confidence 90 vs 65)
Choose Gemini 3.5 Flash when...
- -You need strong classification (confidence 92 vs 85)
- -You need strong extraction (confidence 90 vs 87)
- -Cost matters: 70% 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 3.5 Flash
100K tokens
$1.25
$0.38Cheaper
1M tokens
$12.50
$3.75Cheaper
10M tokens
$125.00
$37.50Cheaper
FAQ
When should I use GPT 5.5 instead of Gemini 3.5 Flash?
GPT 5.5 outperforms Gemini 3.5 Flash for Reasoning, Code Generation, Code Review. It costs $5.00/$30.00 per million tokens (input/output).
Is Gemini 3.5 Flash cheaper than GPT 5.5?
Yes. Gemini 3.5 Flash input costs $1.50/MTok vs $5.00/MTok for GPT 5.5, saving 70% on input.
What are the context window sizes for GPT 5.5 and Gemini 3.5 Flash?
GPT 5.5 has a 128K token context window. Gemini 3.5 Flash 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.