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OpenAI: GPT-5.5 vs xAI: Grok 4.20

Summary

GPT-5.5 vs Grok 4.20 benchmark comparison: GPT-5.5 leads on average score with 9.3 vs 4.4. Grok 4.20 has the lower benchmark cost at $0.057 vs $0.907. Grok 4.20 is faster at 1.11s vs 9.76s, with pass rates of 85.7% vs 28.6%.

Recommended model: GPT-5.5 - It has the strongest score in this comparison (9.3) and the best overall balance of cost and response time across all 2 models.

Last updated at: 2026-07-02

Metric GPT-5.5 GPT-5.5 low Release: 2026-04-24 Grok 4.20 Grok 4.20 none Release: 2026-03-31
Score 9.3 4.4
Rank #4 #160
Reliability 10.0 N/A
Consistency 10.0 8.5
Tests Correct
Attempt pass rate 85.7% 28.6%
Flaky tests 0 0
Total Runs 63 54
Cost per result 5.035 1.570
Total Cost $0.907 $0.057
Input Price $5.000 / 1M $1.250 / 1M
Output Price $30.000 / 1M $2.500 / 1M
Total Input Tokens 34,209 41,313
Output Tokens 2,046 1,923
Reasoning Tokens 22,460 0
Response Time (avg) 9.76s 1.11s
Response Time (max) 56.19s 6.04s
Response Time (total) 204.92s 19.96s

Generation showcase

Hamster playing table tennis

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

#4 GPT-5.5

low
Cost
$0.068
Time
37.0s
Tokens
2,339 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-5.5 10.0 10.0 100.0% 0 4.41s 606 238 1,020
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-5.5 10.0 10.0 100.0% 0 15.04s 7,302 423 6,402
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-5.5 10.0 10.0 100.0% 0 9.56s 11,019 303 717
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-5.5 10.0 10.0 100.0% 0 3.28s 7,140 228 157
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-5.5 5.3 10.0 33.3% 0 28.05s 723 69 11,609
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-5.5 10.0 10.0 100.0% 0 5.17s 477 133 245
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-5.5 9.9 10.0 100.0% 0 3.74s 660 93 415
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-5.5 10.0 10.0 100.0% 0 4.74s 642 279 954
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-5.5 10.0 10.0 100.0% 0 4.96s 5,445 250 101
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-5.5 3.0 10.0 0.0% 0 10.06s 195 30 840
Grok 4.20 0.0 0.0 0.0% 0 0ms 0 0 0

Quick Compare

Switch Comparison Pair

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