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OpenAI: GPT-5.3 Chat vs xAI: Grok 4.20

GPT-5.3 Chat leads on average score with 7.5 vs 7.1. GPT-5.3 Chat has the lower benchmark cost at $0.571 vs $0.777. GPT-5.3 Chat is faster at 6.88s vs 29.47s, with pass rates of 68.2% vs 63.6%.

Recommended modelGPT-5.3 ChatIt has the best score here (7.5), while responding about 4.3x faster than Grok 4.20 (medium).

Last updated at: 2026-07-25

Metric GPT-5.3 Chat GPT-5.3 Chat none Release: 2026-03-03 Grok 4.20 Grok 4.20 medium Release: 2026-03-31
Score 7.5 7.1
Rank #62 #83
Reliability 10.0 10.0
Consistency 8.2 8.5
Tests Correct
Attempt pass rate 68.2% 63.6%
Flaky tests 5 4
Total Runs 66 66
Cost per result 4.387 9.709
Total Cost $0.571 $0.777
Input Price $1.750 / 1M $1.250 / 1M
Output Price $14.000 / 1M $2.500 / 1M
Total Input Tokens 78,990 102,791
Output Tokens 30,854 5,363
Reasoning Tokens 0 253,977
Response Time (avg) 6.88s 29.47s
Response Time (max) 18.33s 199.66s
Response Time (total) 151.31s 648.35s

Hamster playing table tennis

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

#62 GPT-5.3 Chat

none
Cost
$0.008
Time
8.1s
Tokens
634 tok

#83 xAI: Grok 4.20

medium
Cost
$0.041
Time
110.3s
Tokens
16,336 tok

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Score vs Total Cost

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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-5.3 Chat 5.6 4.7 55.6% 2 10.52s 7,302 6,632 0
Grok 4.20 6.3 6.6 55.6% 1 109.93s 8,307 268 103,150

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