tokevenGPTvsGPT
GPT 5.5 vs GPT 5.6 Terra
Side-by-side comparison of pricing, task quality, and projected cost at higher scale.
Pricing
Side-by-side pricing
GPT 5.5
FlagshipGPT 5.6 Terra
Mid-tierInput $/MTok
$5.00
$2.50
Output $/MTok
$30.00
$15.00
Cache discount
90% off
90% 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
86
Code Review
90
vs
84
Summarization
89
vs
92
Q&A
90
vs
92
Extraction
87
vs
90
Reasoning
95
vs
82
Classification
85
vs
89
Creative Writing
91
vs
80
GPT 5.5
GPT 5.6 Terra
Guidance
When to use GPT 5.5 vs GPT 5.6 Terra
Choose GPT 5.5 when...
- -You need strong reasoning (confidence 95 vs 82)
- -You need strong code generation (confidence 91 vs 86)
- -You need strong creative writing (confidence 91 vs 80)
- -You need strong code review (confidence 90 vs 84)
Choose GPT 5.6 Terra when...
- -You need strong summarization (confidence 92 vs 89)
- -You need strong q&a (confidence 92 vs 90)
- -You need strong extraction (confidence 90 vs 87)
- -You need strong classification (confidence 89 vs 85)
- -Cost matters: 50% 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
GPT 5.6 Terra
100K tokens
$1.25
$0.63Cheaper
1M tokens
$12.50
$6.25Cheaper
10M tokens
$125.00
$62.50Cheaper
FAQ
When should I use GPT 5.5 instead of GPT 5.6 Terra?
GPT 5.5 outperforms GPT 5.6 Terra for Reasoning, Code Generation, Code Review. It costs $5.00/$30.00 per million tokens (input/output).
Is GPT 5.6 Terra cheaper than GPT 5.5?
Yes. GPT 5.6 Terra input costs $2.50/MTok vs $5.00/MTok for GPT 5.5, saving 50% on input.
What are the context window sizes for GPT 5.5 and GPT 5.6 Terra?
GPT 5.5 has a 128K token context window. GPT 5.6 Terra 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.