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OpenAI: GPT-5.3-Codex vs xAI: Grok 4.5

The average score is effectively tied at 8.9 vs 8.9. GPT-5.3-Codex (medium) has the lower benchmark cost at $0.920 vs $1.707. GPT-5.3-Codex (medium) is faster at 16.96s vs 76.50s, with pass rates of 83.3% vs 83.3%.

Recommended modelGPT-5.3-Codex (medium)It has the best score here (8.9), while costing about 1.9x less than Grok 4.5 (high).

Last updated at: 2026-07-17

Metric GPT-5.3-Codex GPT-5.3-Codex medium Release: 2026-02-05 Grok 4.5 Grok 4.5 high Release: 2026-07-08
Score 8.9 8.9
Rank #13 #12
Reliability 10.0 10.0
Consistency 8.6 9.2
Tests Correct
Attempt pass rate 83.3% 83.3%
Flaky tests 4 2
Total Runs 66 66
Cost per result 5.748 10.041
Total Cost $0.920 $1.707
Input Price $1.750 / 1M $2.000 / 1M
Output Price $14.000 / 1M $6.000 / 1M
Total Input Tokens 81,268 151,562
Output Tokens 6,251 5,655
Reasoning Tokens 49,274 247,540
Response Time (avg) 16.96s 76.50s
Response Time (max) 100.93s 676.83s
Response Time (total) 373.19s 1683.07s

Hamster playing table tennis

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

#13 GPT-5.3-Codex

medium
Cost
$0.049
Time
54.9s
Tokens
3,580 tok

#12 xAI: Grok 4.5

high
Cost
$0.015
Time
29.7s
Tokens
2,737 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-5.3-Codex 10.0 10.0 100.0% 0 19.50s 7,302 535 10,890
Grok 4.5 10.0 10.0 100.0% 0 155.16s 9,579 357 100,752

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