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OpenAI: GPT-5 Mini vs xAI: Grok 4.5

Grok 4.5 (medium) leads on average score with 8.3 vs 8.1. GPT-5 Mini (medium) has the lower benchmark cost at $0.237 vs $1.928. GPT-5 Mini (medium) is faster at 27.63s vs 61.71s, with pass rates of 63.6% vs 78.8%.

Recommended modelGPT-5 Mini (medium)Its score stays close to the best score here (8.1 vs 8.3), while costing about 8.2x less than Grok 4.5 (medium).

Last updated at: 2026-07-25

Metric GPT-5 Mini GPT-5 Mini medium Release: 2025-08-07 Grok 4.5 Grok 4.5 medium Release: 2026-07-08
Score 8.1 8.3
Rank #32 #28
Reliability 10.0 10.0
Consistency 8.8 8.9
Tests Correct
Attempt pass rate 63.6% 78.8%
Flaky tests 3 3
Total Runs 66 66
Cost per result 1.971 12.049
Total Cost $0.237 $1.928
Input Price $0.250 / 1M $2.000 / 1M
Output Price $2.000 / 1M $6.000 / 1M
Total Input Tokens 98,374 122,146
Output Tokens 14,434 5,514
Reasoning Tokens 91,498 275,053
Response Time (avg) 27.63s 61.71s
Response Time (max) 111.48s 436.38s
Response Time (total) 607.92s 1357.56s

Hamster playing table tennis

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

#32 GPT-5 Mini

medium
Cost
$0.007
Time
42.9s
Tokens
3,432 tok

#28 xAI: Grok 4.5

medium
Cost
$0.044
Time
59.4s
Tokens
7,512 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 Mini 10.0 10.0 100.0% 0 27.63s 7,302 658 17,152
Grok 4.5 7.6 7.2 77.8% 1 155.69s 9,579 390 104,634

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