tokevenGPTvsGPT
GPT 5.6 Terra vs o3
Side-by-side comparison of pricing, task quality, and projected cost at higher scale.
Pricing
Side-by-side pricing
GPT 5.6 Terra
Mid-tiero3
Mid-tierInput $/MTok
$2.00
$2.00
Output $/MTok
$12.00
$8.00
Cache discount
90% off
75% off
Context
922K
200K
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
o3
Guidance
When to use GPT 5.6 Terra vs o3
Choose GPT 5.6 Terra when...
- -You need a larger context window (922K vs 200K)
- Similar performance; consider provider preference or ecosystem fit.
Choose o3 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
o3
100K tokens
$0.50
$0.38Cheaper
1M tokens
$8.20
$3.80Cheaper
10M tokens
$82.00
$38.00Cheaper
FAQ
When should I use GPT 5.6 Terra instead of o3?
GPT 5.6 Terra and o3 perform similarly across all tracked tasks. Pick based on pricing and provider preference.
Is o3 cheaper than GPT 5.6 Terra?
Both models have the same input pricing at $2.00/MTok. Compare output pricing: $12.00 vs $8.00/MTok.
What are the context window sizes for GPT 5.6 Terra and o3?
GPT 5.6 Terra has a 922K token context window. o3 has a 200K 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 o3 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.