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OpenAI: GPT-5.5 vs Z.ai: GLM 5.1

Summary

GPT-5.5 vs GLM 5.1 benchmark comparison: GPT-5.5 leads on average score with 9.3 vs 5.6. GLM 5.1 has the lower benchmark cost at $0.063 vs $0.907. GLM 5.1 is faster at 4.10s vs 9.76s, with pass rates of 85.7% vs 41.3%.

Recommended model: GPT-5.5 - 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: 2026-07-02

Metric GPT-5.5 GPT-5.5 low Release: 2026-04-24 GLM 5.1 GLM 5.1 none Release: 2026-04-07
Score 9.3 5.6
Rank #4 #120
Reliability 10.0 10.0
Consistency 10.0 8.5
Tests Correct
Attempt pass rate 85.7% 41.3%
Flaky tests 0 4
Total Runs 63 63
Cost per result 5.035 0.843
Total Cost $0.907 $0.063
Input Price $5.000 / 1M $0.975 / 1M
Output Price $30.000 / 1M $4.301 / 1M
Total Input Tokens 34,209 47,133
Output Tokens 2,046 3,754
Reasoning Tokens 22,460 0
Response Time (avg) 9.76s 4.10s
Response Time (max) 56.19s 32.57s
Response Time (total) 204.92s 86.18s

Generation showcase

Hamster playing table tennis

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

#4 GPT-5.5

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

#120 GLM 5.1

none
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 4.41s 606 238 1,020
GLM 5.1 4.0 6.3 25.0% 2 2.11s 555 305 0
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
GLM 5.1 3.9 9.7 0.0% 0 4.96s 7,256 525 0
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
GLM 5.1 2.8 2.1 33.3% 1 32.57s 22,831 2,129 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 3.28s 7,140 228 157
GLM 5.1 10.0 10.0 100.0% 0 1.08s 7,107 204 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
GLM 5.1 2.9 7.2 11.1% 1 1.99s 687 24 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 5.17s 477 133 245
GLM 5.1 5.0 10.0 0.0% 0 790ms 477 39 0
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
GLM 5.1 9.8 10.0 100.0% 0 1.98s 636 66 0
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
GLM 5.1 7.7 10.0 66.7% 0 1.45s 609 151 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 4.96s 5,445 250 101
GLM 5.1 10.0 10.0 100.0% 0 10.68s 6,789 300 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 10.06s 195 30 840
GLM 5.1 3.0 10.0 0.0% 0 2.34s 186 11 0

Quick Compare

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