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

Summary

GPT-5.5 (low) vs GPT-5.6 Terra (low) benchmark comparison: GPT-5.5 (low) leads on average score with 9.3 vs 7.7. GPT-5.6 Terra (low) has the lower benchmark cost at $0.343 vs $0.907. GPT-5.6 Terra (low) is faster at 4.88s vs 9.76s, with pass rates of 85.7% vs 74.6%.

Recommended model: GPT-5.5 (low) - It has the strongest score in this comparison (9.3) and the best overall balance of cost and response time across all 2 models.

Last updated at: 2026-07-09

Metric GPT-5.5 GPT-5.5 low Release: 2026-04-24 GPT-5.6 Terra GPT-5.6 Terra low Release: 2026-07-09
Score 9.3 7.7
Rank #7 #47
Reliability 10.0 10.0
Consistency 10.0 8.1
Tests Correct
Attempt pass rate 85.7% 74.6%
Flaky tests 0 5
Total Runs 63 63
Cost per result 5.035 2.637
Total Cost $0.907 $0.343
Input Price $5.000 / 1M $2.500 / 1M
Output Price $30.000 / 1M $15.000 / 1M
Total Input Tokens 34,209 34,226
Output Tokens 2,046 1,943
Reasoning Tokens 22,460 15,201
Response Time (avg) 9.76s 4.88s
Response Time (max) 56.19s 19.85s
Response Time (total) 204.92s 102.53s

Generation showcase

Hamster playing table tennis

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

#7 GPT-5.5

low
Cost
$0.068
Time
37.0s
Tokens
2,339 tok

#47 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

Anti-AI Tricks 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 4.41s 606 238 1,020
GPT-5.6 Terra 8.3 10.0 75.0% 0 2.36s 606 171 602
Coding 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 15.04s 7,302 423 6,402
GPT-5.6 Terra 6.6 4.6 77.8% 2 9.56s 7,302 429 6,821
Combined 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 9.56s 11,019 303 717
GPT-5.6 Terra 10.0 10.0 100.0% 0 5.07s 11,019 312 349
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 3.28s 7,140 228 157
GPT-5.6 Terra 10.0 10.0 100.0% 0 919ms 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 5.3 10.0 33.3% 0 28.05s 723 69 11,609
GPT-5.6 Terra 5.3 7.2 44.4% 1 8.34s 723 72 4,086
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 5.17s 477 133 245
GPT-5.6 Terra 4.8 3.2 33.3% 1 3.52s 477 105 249
Instructions following Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.5 9.9 10.0 100.0% 0 3.74s 660 93 415
GPT-5.6 Terra 10.0 10.0 100.0% 0 1.48s 660 87 134
Puzzle Solving 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 4.74s 642 279 954
GPT-5.6 Terra 10.0 10.0 100.0% 0 4.46s 642 259 1,506
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 4.96s 5,445 250 101
GPT-5.6 Terra 4.7 1.6 66.7% 1 6.69s 5,462 257 226
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 10.06s 195 30 840
GPT-5.6 Terra 3.0 10.0 0.0% 0 5.95s 195 29 1,228

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