GPT-6 and GPT-5.6 SVG reasoning-effort comparison

Prices per 1M input/output tokens: Astra $10/$50, Sol $4/$20, Terra $2/$12, Luna $0.20/$1.20.

Effort	gpt-6-astra	gpt-5.6-sol	gpt-5.6-terra	gpt-5.6-luna
max	16 input tokens, 12,638 output = 63.21 cents	26 input tokens, 16,180 output = 32.37 cents	26 input tokens, 21,390 output = 25.67 cents	16 input tokens, 13,040 output = 1.57 cents
xhigh	16 input tokens, 6,766 output = 33.85 cents	26 input tokens, 8,033 output = 16.08 cents	26 input tokens, 9,776 output = 11.74 cents	16 input tokens, 7,072 output = 0.85 cents
high	16 input tokens, 3,671 output = 18.37 cents	26 input tokens, 3,454 output = 6.92 cents	26 input tokens, 2,486 output = 2.99 cents	16 input tokens, 4,098 output = 0.49 cents
medium	16 input tokens, 2,560 output = 12.82 cents	26 input tokens, 3,511 output = 7.03 cents	26 input tokens, 2,302 output = 2.77 cents	16 input tokens, 2,089 output = 0.25 cents
low	16 input tokens, 1,906 output = 9.55 cents	26 input tokens, 2,772 output = 5.55 cents	26 input tokens, 2,312 output = 2.78 cents	16 input tokens, 1,258 output = 0.15 cents
none	Not available	26 input tokens, 1,961 output = 3.93 cents	26 input tokens, 1,731 output = 2.08 cents	16 input tokens, 1,176 output = 0.14 cents