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GPT-5.6 Luna (high) vs GPT-5.6 Terra (low)

GPT-5.6 Luna (high) leads on average score with 8.0 vs 7.9. GPT-5.6 Luna (high) has the lower benchmark cost at $0.118 vs $0.435. GPT-5.6 Terra (low) is faster at 7.58s vs 18.39s, with pass rates of 71.0% vs 75.4%.

Last updated at: 2026-10-07

Compared models

Rank
#96
Total Output Tokens
139,395
Response Time (avg)
18.39s
Total Cost
$0.118
Rank
#101
Total Output Tokens
24,213
Response Time (avg)
7.58s
Total Cost
$0.435
Recommended model GPT-5.6 Luna (high)

It has the best score here (8.0), while costing about 3.7x less than GPT-5.6 Terra (low).

Detailed comparison

Metric GPT-5.6 Luna GPT-5.6 Luna high Release: 2026-07-09 GPT-5.6 Terra GPT-5.6 Terra low Release: 2026-07-09
Score 8.0 7.9
Rank #96 #101
Reliability 10.0 10.0
Consistency 8.6 8.0
Attempts 69/69 69/69
Tests Correct
Attempt pass rate 71.0% 75.4%
Flaky tests 4 6
Total Runs 69 69
Cost per result 5.882 5.277
Total Cost $0.118 $0.435
Input Price $0.200 / 1M $2.000 / 1M
Output Price $1.200 / 1M $12.000 / 1M
Cache Read Price $0.020 / 1M $0.200 / 1M
Cache Write Price $0.250 / 1M $2.500 / 1M
Total Input Tokens 197,896 176,890
Output Tokens 6,211 5,688
Reasoning Tokens 133,184 18,525
Response Time (avg) 18.39s 7.58s
Response Time (max) 111.09s 54.57s
Response Time (total) 422.93s 174.39s
Parameters ~400B total (~17B active) ~1T total (~60B active)
Availability Closed Closed

Cache prices apply to input tokens. Reads reuse cached prompts; writes store them and can cost extra. Output tokens use the output price.

Model generation showcase

Hamster playing table tennis

Prompt: Create a detailed SVG illustration of a hamster playing table tennis.

#96 GPT-5.6 Luna

high
Cost
$0.033
Time
34.2s
Tokens
5,484 tok

#101 GPT-5.6 Terra

low
Cost
$0.034
Time
16.8s
Tokens
2,348 tok

Top Models by Score

Score vs Total Cost

Response Time (avg)

Score vs Response Time (avg)

Total Output Tokens

Score vs Total Output Tokens

Category Breakdown

Coding Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.6 Luna 5.5 4.7 55.6% 2 15.63s 7,302 510 17,746
GPT-5.6 Terra 6.6 4.6 77.8% 2 9.56s 7,302 429 6,821

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