tokevenGPTvsGPT
GPT 5.6 Terra vs GPT 4o
Side-by-side comparison of pricing, task quality, and projected cost at higher scale.
Pricing
Side-by-side pricing
GPT 5.6 Terra
Mid-tierGPT 4o
Mid-tierInput $/MTok
$2.00
$2.50
Output $/MTok
$12.00
$10.00
Cache discount
90% off
50% off
Context
922K
128K
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
GPT 4o
Guidance
When to use GPT 5.6 Terra vs GPT 4o
Choose GPT 5.6 Terra when...
- -Cost matters: 20% cheaper on input tokens
- -You need a larger context window (922K vs 128K)
Choose GPT 4o when...
- 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 5.6 Terra
GPT 4o
100K tokens
$0.50
$0.47Cheaper
1M tokens
$8.20
$4.75Cheaper
10M tokens
$82.00
$47.50Cheaper
FAQ
When should I use GPT 5.6 Terra instead of GPT 4o?
GPT 5.6 Terra and GPT 4o perform similarly across all tracked tasks. Pick based on pricing and provider preference.
Is GPT 4o cheaper than GPT 5.6 Terra?
GPT 4o input costs $2.50/MTok, which is 25% more than GPT 5.6 Terra at $2.00/MTok.
What are the context window sizes for GPT 5.6 Terra and GPT 4o?
GPT 5.6 Terra has a 922K token context window. GPT 4o has a 128K 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 GPT 4o 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.