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OpenAI: GPT-5.4 Mini vs xAI: Grok 4.20

Summary

GPT-5.4 Mini vs Grok 4.20 benchmark comparison: GPT-5.4 Mini leads on average score with 5.3 vs 4.4. GPT-5.4 Mini has the lower benchmark cost at $0.038 vs $0.057. Grok 4.20 is faster at 1.11s vs 1.13s, with pass rates of 30.2% vs 28.6%.

Recommended model: GPT-5.4 Mini - It has the best score here (5.3), while costing about 1.5x less than Grok 4.20.

Last updated at: 2026-07-02

Metric GPT-5.4 Mini GPT-5.4 Mini none Release: 2026-03-17 Grok 4.20 Grok 4.20 none Release: 2026-03-31
Score 5.3 4.4
Rank #129 #160
Reliability 10.0 N/A
Consistency 8.8 8.5
Tests Correct
Attempt pass rate 30.2% 28.6%
Flaky tests 3 0
Total Runs 63 54
Cost per result 0.743 1.570
Total Cost $0.038 $0.057
Input Price $0.750 / 1M $1.250 / 1M
Output Price $4.500 / 1M $2.500 / 1M
Total Input Tokens 34,244 41,313
Output Tokens 2,541 1,923
Reasoning Tokens 0 0
Response Time (avg) 1.13s 1.11s
Response Time (max) 2.52s 6.04s
Response Time (total) 23.82s 19.96s

Generation showcase

Hamster playing table tennis

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

#129 GPT-5.4 Mini

none
Cost
$0.010
Time
11.7s
Tokens
2,151 tok

#160 xAI: Grok 4.20

none
Cost
$0.004
Time
6.5s
Tokens
1,367 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-5.4 Mini 3.1 8.1 8.3% 1 929ms 606 654 0
Grok 4.20 4.8 10.0 25.0% 0 501ms 1,986 267 0
Coding Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.4 Mini 5.5 10.0 33.3% 0 913ms 7,305 401 0
Grok 4.20 1.1 3.1 0.0% 0 1.22s 1,074 312 0
Combined Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.4 Mini 3.0 10.0 0.0% 0 2.52s 11,019 298 0
Grok 4.20 3.0 10.0 0.0% 0 6.04s 17,673 282 0
Data parsing and extraction Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.4 Mini 10.0 10.0 100.0% 0 1.30s 7,140 222 0
Grok 4.20 10.0 10.0 100.0% 0 522ms 7,749 207 0
Domain specific Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.4 Mini 3.5 4.4 33.3% 2 937ms 723 88 0
Grok 4.20 3.0 10.0 0.0% 0 687ms 1,746 325 0
General Intelligence Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.4 Mini 4.8 10.0 0.0% 0 1.82s 477 174 0
Grok 4.20 4.8 10.0 0.0% 0 659ms 819 83 0
Instructions following Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.4 Mini 6.3 10.0 50.0% 0 728ms 660 101 0
Grok 4.20 6.3 10.0 50.0% 0 445ms 1,350 60 0
Puzzle Solving Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.4 Mini 5.4 10.0 33.3% 0 836ms 642 305 0
Grok 4.20 5.3 10.0 33.3% 0 473ms 1,671 198 0
Tool Calling Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.4 Mini 3.0 10.0 0.0% 0 2.32s 5,477 255 0
Grok 4.20 10.0 10.0 100.0% 0 4.63s 7,245 189 0
Trivia Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.4 Mini 3.0 10.0 0.0% 0 1.33s 195 43 0
Grok 4.20 0.0 0.0 0.0% 0 0ms 0 0 0

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