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Claude Opus 4.8 (low) vs GPT-5.6 Terra (medium)

GPT-5.6 Terra (medium) leads on average score with 7.8 vs 7.8. GPT-5.6 Terra (medium) has the lower benchmark cost at $0.523 vs $2.089. GPT-5.6 Terra (medium) is faster at 6.85s vs 12.88s, with pass rates of 80.3% vs 69.7%.

Last updated at: 2026-08-20

Rank
#70
Total Output Tokens
52,237
Response Time (avg)
12.88s
Total Cost
$2.089
Rank
#66
Total Output Tokens
30,349
Response Time (avg)
6.85s
Total Cost
$0.523
Recommended model GPT-5.6 Terra (medium)

It has the best score here (7.8), while costing about 4.0x less than Claude Opus 4.8 (low).

Detailed comparison

Metric Claude Opus 4.8 Claude Opus 4.8 low Release: 2026-05-28 GPT-5.6 Terra GPT-5.6 Terra medium Release: 2026-07-09
Score 7.8 7.8
Rank #70 #66
Reliability 10.0 10.0
Consistency 8.9 9.3
Attempts 66/66 66/66
Tests Correct
Attempt pass rate 80.3% 69.7%
Flaky tests 3 2
Total Runs 66 66
Cost per result 13.054 4.603
Total Cost $2.089 $0.523
Input Price $5.000 / 1M $2.000 / 1M
Output Price $25.000 / 1M $12.000 / 1M
Total Input Tokens 156,522 79,184
Output Tokens 43,056 4,878
Reasoning Tokens 9,181 25,471
Response Time (avg) 12.88s 6.85s
Response Time (max) 127.97s 41.68s
Response Time (total) 283.32s 150.65s
Parameters ~5T total (~500B active) ~1T total (~60B active)
Availability Closed Closed

Model generation showcase

Hamster playing table tennis

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

#70 Claude Opus 4.8

low
Cost
$0.031
Time
14.1s
Tokens
1,345 tok

#66 GPT-5.6 Terra

medium
Cost
$0.035
Time
16.3s
Tokens
2,418 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
Claude Opus 4.8 6.6 4.6 77.8% 2 7.58s 10,590 3,637 809
GPT-5.6 Terra 6.1 7.2 55.6% 1 7.19s 7,302 427 4,527

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