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OpenAI: GPT-5.5 vs Z.ai: GLM 5.2

Summary

GPT-5.5 (medium) vs GLM 5.2 (high) benchmark comparison: GPT-5.5 (medium) leads on average score with 9.0 vs 8.0. GLM 5.2 (high) has the lower benchmark cost at $0.554 vs $3.679. GLM 5.2 (high) is faster at 37.09s vs 37.98s, with pass rates of 87.3% vs 77.8%.

Recommended model: GLM 5.2 (high) - It offers the best overall trade-off: a competitive score (8.0), lower cost than GPT-5.5 (medium), and balanced response time.

Last updated at: 2026-07-10

Metric GPT-5.5 GPT-5.5 medium Release: 2026-04-24 GLM 5.2 GLM 5.2 high Release: 2026-06-17
Score 9.0 8.0
Rank #12 #32
Reliability 10.0 9.3
Consistency 8.9 7.6
Tests Correct
Attempt pass rate 87.3% 77.8%
Flaky tests 3 6
Total Runs 63 63
Cost per result 21.638 4.255
Total Cost $3.679 $0.554
Input Price $5.000 / 1M $0.770 / 1M
Output Price $30.000 / 1M $2.420 / 1M
Total Input Tokens 34,212 34,993
Output Tokens 1,985 51,575
Reasoning Tokens 114,925 166,065
Response Time (avg) 37.98s 37.09s
Response Time (max) 332.10s 180.69s
Response Time (total) 797.60s 778.91s

Generation showcase

Hamster playing table tennis

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

#12 GPT-5.5

medium
Cost
$0.112
Time
71.9s
Tokens
3,807 tok

#32 GLM 5.2

high
Invalid SVG
Cost
$0.000
Time
300.0s
Tokens
0 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 4.66s 606 250 1,335
GLM 5.2 10.0 10.0 100.0% 0 5.80s 639 406 2,660
Coding Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.5 8.8 7.8 88.9% 1 59.77s 7,305 362 24,959
GLM 5.2 6.4 4.4 77.8% 2 73.03s 5,124 2,302 22,546
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 19.29s 11,019 312 2,841
GLM 5.2 10.0 10.0 100.0% 0 43.51s 12,696 711 4,267
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 4.18s 7,140 234 593
GLM 5.2 10.0 10.0 100.0% 0 5.81s 7,143 435 1,414
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 7.2 44.4% 1 164.14s 723 67 79,625
GLM 5.2 3.5 4.4 33.3% 2 73.97s 551 46,693 90,566
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 4.16s 477 138 223
GLM 5.2 10.0 10.0 100.0% 0 12.90s 498 63 1,743
Instructions following 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 3.36s 660 93 538
GLM 5.2 10.0 10.0 100.0% 0 4.26s 678 151 1,210
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 6.76s 642 241 2,225
GLM 5.2 6.0 4.6 66.7% 2 33.71s 665 568 22,392
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 10.57s 5,445 258 832
GLM 5.2 10.0 10.0 100.0% 0 9.25s 6,861 246 503
Trivia Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.5 2.8 1.6 33.3% 1 37.86s 195 30 1,754
GLM 5.2 3.0 10.0 0.0% 0 127.82s 138 0 18,764

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