GPT-5.6 Terra vs GPT-6 Astra
Which is the better AI model in 2026? Here's how they compare.
Capability profile
Artificial Analysis indices (0–100). Missing dimensions show as 0.
Head to head
GPT-5.6 Terra
GPT-6 Astra
Intelligence
42.1
52.7
Coding
76.7
76.9
Math
—
—
Context window
1,050,000
1,050,000
Output price
$12/1M
$50/1M
Input price
$2/1M
$10/1M
Speed (t/s)
128
61
Knowledge cutoff
2026-02-16
2026-04-30
Open weights
No
No
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