tokevenGPTvsGemini
GPT 5.6 Terra vs Gemini 3.8 Flash
Side-by-side comparison of pricing, task quality, and projected cost at higher scale.
Pricing
Side-by-side pricing
GPT 5.6 Terra
Mid-tierGemini 3.8 Flash
Fast / BudgetInput $/MTok
$2.00
$0.75
Output $/MTok
$12.00
$3.75
Cache discount
90% off
90% off
Context
922K
1,048.576K
Quality
Task confidence comparison
Confidence score from zero to one hundred by task type, where higher is better.
Code Generation
86
vs
0
Code Review
84
vs
0
Summarization
92
vs
0
Q&A
92
vs
0
Extraction
90
vs
0
Reasoning
82
vs
0
Classification
89
vs
0
Creative Writing
80
vs
0
GPT 5.6 Terra
Gemini 3.8 Flash
Guidance
When to use GPT 5.6 Terra vs Gemini 3.8 Flash
Choose GPT 5.6 Terra when...
- Similar performance; consider provider preference or ecosystem fit.
Choose Gemini 3.8 Flash when...
- -Cost matters: 63% cheaper on input tokens
- -You need a larger context window (1,048.576K vs 922K)
At scale
Cost at scale
Estimated cost assuming a seventy percent input and thirty percent output token split.
GPT 5.6 Terra
Gemini 3.8 Flash
100K tokens
$0.50
$0.16Cheaper
1M tokens
$8.20
$1.65Cheaper
10M tokens
$82.00
$16.50Cheaper
FAQ
When should I use GPT 5.6 Terra instead of Gemini 3.8 Flash?
GPT 5.6 Terra and Gemini 3.8 Flash perform similarly across all tracked tasks. Pick based on pricing and provider preference.
Is Gemini 3.8 Flash cheaper than GPT 5.6 Terra?
Yes. Gemini 3.8 Flash input costs $0.75/MTok vs $2.00/MTok for GPT 5.6 Terra, saving 63% on input.
What are the context window sizes for GPT 5.6 Terra and Gemini 3.8 Flash?
GPT 5.6 Terra has a 922K token context window. Gemini 3.8 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 GPT 5.6 Terra and Gemini 3.8 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.