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OpenAI: GPT-5.5 vs OpenAI: GPT-5.6 Terra

Summary

GPT-5.5 vs GPT-5.6 Terra benchmark comparison: GPT-5.5 leads on average score with 6.3 vs 6.0. GPT-5.6 Terra has the lower benchmark cost at $0.130 vs $0.231. GPT-5.6 Terra is faster at 1.25s vs 1.89s, with pass rates of 54.0% vs 42.9%.

Recommended model: GPT-5.6 Terra - Its score stays close to the best score here (6.0 vs 6.3), while costing about 1.8x less than GPT-5.5.

Last updated at: 2026-07-09

Metric GPT-5.5 GPT-5.5 none Release: 2026-04-24 GPT-5.6 Terra GPT-5.6 Terra none Release: 2026-07-09
Score 6.3 6.0
Rank #104 #116
Reliability 10.0 10.0
Consistency 8.8 9.3
Tests Correct
Attempt pass rate 54.0% 42.9%
Flaky tests 3 2
Total Runs 63 63
Cost per result 2.302 1.623
Total Cost $0.231 $0.130
Input Price $5.000 / 1M $2.500 / 1M
Output Price $30.000 / 1M $15.000 / 1M
Total Input Tokens 34,212 39,552
Output Tokens 1,971 2,060
Reasoning Tokens 0 0
Response Time (avg) 1.89s 1.25s
Response Time (max) 5.56s 3.97s
Response Time (total) 39.64s 26.21s

Generation showcase

Hamster playing table tennis

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

#104 GPT-5.5

none
Cost
$0.090
Time
54.3s
Tokens
3,063 tok

#116 GPT-5.6 Terra

none
Cost
$0.030
Time
14.7s
Tokens
2,082 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

Anti-AI Tricks Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.5 6.9 7.9 66.7% 1 1.31s 606 213 0
GPT-5.6 Terra 4.8 10.0 25.0% 0 942ms 606 191 0
Coding Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.5 5.5 10.0 33.3% 0 1.35s 7,305 462 0
GPT-5.6 Terra 5.5 10.0 33.3% 0 1.00s 7,302 336 0
Combined Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.5 3.0 10.0 0.0% 0 5.56s 11,019 300 0
GPT-5.6 Terra 3.0 10.0 0.0% 0 3.97s 14,961 437 0
Data parsing and extraction Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.5 10.0 10.0 100.0% 0 1.18s 7,140 222 0
GPT-5.6 Terra 10.0 10.0 100.0% 0 1.13s 7,140 222 0
Domain specific Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.5 2.9 7.2 11.1% 1 1.31s 723 52 0
GPT-5.6 Terra 5.3 7.2 44.4% 1 757ms 723 68 0
General Intelligence Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.5 10.0 10.0 100.0% 0 3.41s 477 124 0
GPT-5.6 Terra 5.0 10.0 0.0% 0 1.03s 477 102 0
Instructions following Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.5 6.2 5.8 66.7% 1 1.15s 660 81 0
GPT-5.6 Terra 8.5 6.8 83.3% 1 1.15s 660 101 0
Puzzle Solving Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.5 7.7 10.0 66.7% 0 1.29s 642 252 0
GPT-5.6 Terra 5.3 10.0 33.3% 0 1.23s 642 235 0
Tool Calling Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.5 10.0 10.0 100.0% 0 3.90s 5,445 247 0
GPT-5.6 Terra 9.6 10.0 100.0% 0 3.10s 6,846 344 0
Trivia Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.5 3.0 10.0 0.0% 0 5.01s 195 18 0
GPT-5.6 Terra 3.0 10.0 0.0% 0 787ms 195 24 0

Quick Compare

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