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OpenAI: GPT-5.3 Chat vs xAI: Grok 4.20

Last updated at: 2026-06-04

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 7.2 7.1
Rank #63 #65
Reliability 10.0 10.0
Consistency 8.1 8.8
Tests Correct
Attempt pass rate 66.7% 63.5%
Flaky tests 5 3
Total Runs 63 63
Cost per result 3.605 8.309
Total Cost $0.433 $0.609
Input Price $1.750 / 1M $1.250 / 1M
Output Price $14.000 / 1M $2.500 / 1M
Total Input Tokens 34,209 44,433
Output Tokens 26,617 1,819
Reasoning Tokens 0 219,524
Response Time (avg) 6.34s 27.68s
Response Time (max) 18.33s 199.66s
Response Time (total) 133.13s 581.26s

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Score vs Total Cost

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Score vs Response Time (avg)

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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-5.3 Chat 6.7 8.1 58.3% 1 3.86s 606 3,167 0
Grok 4.20 8.2 7.9 83.3% 1 3.95s 2,010 287 8,312
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
Combined Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.3 Chat 10.0 10.0 100.0% 0 11.96s 11,019 2,614 0
Grok 4.20 10.0 10.0 100.0% 0 17.40s 12,909 232 9,556
Data parsing and extraction Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.3 Chat 10.0 10.0 100.0% 0 2.21s 7,140 942 0
Grok 4.20 10.0 10.0 100.0% 0 4.17s 7,761 180 5,333
Domain specific Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.3 Chat 3.5 4.4 33.3% 2 13.01s 723 8,264 0
Grok 4.20 5.3 10.0 33.3% 0 27.03s 1,764 375 49,339
General Intelligence Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.3 Chat 4.6 10.0 0.0% 0 1.99s 477 319 0
Grok 4.20 3.9 2.6 33.3% 1 24.48s 825 65 6,440
Instructions following Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.3 Chat 9.8 10.0 100.0% 0 3.51s 660 1,491 0
Grok 4.20 9.8 10.0 100.0% 0 4.26s 1,362 57 6,419
Puzzle Solving Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.3 Chat 10.0 10.0 100.0% 0 2.99s 642 1,758 0
Grok 4.20 7.7 10.0 66.7% 0 6.22s 1,689 149 7,913
Tool Calling Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.3 Chat 10.0 10.0 100.0% 0 8.36s 5,445 861 0
Grok 4.20 3.0 10.0 0.0% 0 13.68s 7,275 197 6,620
Trivia Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.3 Chat 3.0 10.0 0.0% 0 4.38s 195 569 0
Grok 4.20 3.0 10.0 0.0% 0 63.48s 531 9 16,442

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