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OpenAI: GPT-5.5 vs xAI: Grok 4.5

GPT-5.5 (low) leads on average score with 9.3 vs 8.9. GPT-5.5 (low) has the lower benchmark cost at $1.253 vs $1.707. GPT-5.5 (low) is faster at 10.13s vs 76.50s, with pass rates of 86.4% vs 83.3%.

Recommended modelGPT-5.5 (low)It has the best score here (9.3), while responding about 7.6x faster than Grok 4.5 (high).

Last updated at: 2026-07-17

Metric GPT-5.5 GPT-5.5 low Release: 2026-04-24 Grok 4.5 Grok 4.5 high Release: 2026-07-08
Score 9.3 8.9
Rank #6 #12
Reliability 10.0 10.0
Consistency 10.0 9.2
Tests Correct
Attempt pass rate 86.4% 83.3%
Flaky tests 0 2
Total Runs 66 66
Cost per result 6.594 10.041
Total Cost $1.253 $1.707
Input Price $5.000 / 1M $2.000 / 1M
Output Price $30.000 / 1M $6.000 / 1M
Total Input Tokens 80,058 151,562
Output Tokens 5,378 5,655
Reasoning Tokens 23,040 247,540
Response Time (avg) 10.13s 76.50s
Response Time (max) 56.19s 676.83s
Response Time (total) 222.82s 1683.07s

Hamster playing table tennis

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

#6 GPT-5.5

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

#12 xAI: Grok 4.5

high
Cost
$0.015
Time
29.7s
Tokens
2,737 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
GPT-5.5 10.0 10.0 100.0% 0 15.04s 7,302 423 6,402
Grok 4.5 10.0 10.0 100.0% 0 155.16s 9,579 357 100,752

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