tokevenGPTvsGPT
GPT 5.6 Terra vs GPT 5.5 Pro
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 5.5 Pro
FlagshipInput $/MTok
$2.00
$30.00
Output $/MTok
$12.00
$180.00
Cache discount
90% off
0% off
Context
922K
1,050K
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 5.5 Pro
Guidance
When to use GPT 5.6 Terra vs GPT 5.5 Pro
Choose GPT 5.6 Terra when...
- -Cost matters: 93% cheaper on input tokens
Choose GPT 5.5 Pro when...
- -You need a larger context window (1,050K vs 922K)
- 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 5.5 Pro
100K tokens
$0.50Cheaper
$7.50
1M tokens
$8.20Cheaper
$123.00
10M tokens
$82.00Cheaper
$1230.00
FAQ
When should I use GPT 5.6 Terra instead of GPT 5.5 Pro?
GPT 5.6 Terra and GPT 5.5 Pro perform similarly across all tracked tasks. Pick based on pricing and provider preference.
Is GPT 5.5 Pro cheaper than GPT 5.6 Terra?
GPT 5.5 Pro input costs $30.00/MTok, which is 1400% more than GPT 5.6 Terra at $2.00/MTok.
What are the context window sizes for GPT 5.6 Terra and GPT 5.5 Pro?
GPT 5.6 Terra has a 922K token context window. GPT 5.5 Pro has a 1,050K 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 5.5 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.