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GPT-5.6 Terra (high) vs GPT-6 Luna (medium)

GPT-5.6 Terra (high) leads on average score with 8.3 vs 8.3. GPT-6 Luna (medium) has the lower benchmark cost at $0.047 vs $0.698. GPT-5.6 Terra (high) is faster at 13.62s vs 18.07s, with pass rates of 69.6% vs 73.9%.

Last updated at: 2026-10-07

Compared models

Rank
#79
Total Output Tokens
60,065
Response Time (avg)
13.62s
Total Cost
$0.698
Rank
#83
Total Output Tokens
53,161
Response Time (avg)
18.07s
Total Cost
$0.047
Recommended model GPT-6 Luna (medium)

Its score stays close to the best score here (8.3 vs 8.3), while costing about 14.9x less than GPT-5.6 Terra (high).

Detailed comparison

Metric GPT-5.6 Terra GPT-5.6 Terra high Release: 2026-07-09 GPT-6 Luna GPT-6 Luna medium Release: 2026-09-23
Score 8.3 8.3
Rank #79 #83
Reliability 10.0 10.0
Consistency 9.4 8.9
Attempts 69/69 69/69
Tests Correct
Attempt pass rate 69.6% 73.9%
Flaky tests 2 3
Total Runs 69 69
Cost per result 8.674 0.313
Total Cost $0.698 $0.047
Input Price $2.000 / 1M $0.100 / 1M
Output Price $12.000 / 1M $0.500 / 1M
Cache Read Price $0.200 / 1M $0.010 / 1M
Cache Write Price $2.500 / 1M $0.125 / 1M
Total Input Tokens 197,239 203,193
Output Tokens 6,083 5,751
Reasoning Tokens 53,982 47,410
Response Time (avg) 13.62s 18.07s
Response Time (max) 91.49s 66.44s
Response Time (total) 313.21s 415.53s
Parameters ~1T total (~60B active) ~400B total (~17B 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.

#79 GPT-5.6 Terra

high
Cost
$0.055
Time
30.2s
Tokens
3,748 tok

#83 GPT-6 Luna

medium
Cost
$0.002
Time
23.6s
Tokens
2,966 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 Terra 7.6 7.2 77.8% 1 9.14s 7,302 370 6,087
GPT-6 Luna 6.6 4.6 77.8% 2 23.63s 7,302 438 10,222

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