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OpenAI: GPT-5.3-Codex vs OpenAI: GPT-5.5

Last updated at: 2026-04-24

Metric GPT-5.3-Codex GPT-5.3-Codex medium Release: 2026-02-05 GPT-5.5 GPT-5.5 medium Release: 2026-04-24
Score 8.6 9.0
Rank #8 #5
Reliability N/A N/A
Consistency 8.7 9.2
Tests Correct
Attempt pass rate 83.3% 87.0%
Flaky tests 3 2
Total Runs 54 54
Cost per result 4.405 19.226
Total Cost $0.573 $2.884
Input Price $1.750 / 1M $5.000 / 1M
Output Price $14.000 / 1M $30.000 / 1M
Output Tokens 2,279 1,920
Reasoning Tokens 35,179 89,632
Response Time (avg) 15.38s 32.75s
Response Time (max) 100.93s 332.10s
Response Time (total) 276.91s 589.59s

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) Output Tokens Reasoning Tokens
GPT-5.3-Codex 8.7 7.9 91.7% 1 4.16s 240 1,722
GPT-5.5 10.0 10.0 100.0% 0 4.66s 250 1,335
Coding Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
GPT-5.3-Codex 10.0 10.0 100.0% 0 8.95s 491 1,530
GPT-5.5 10.0 10.0 100.0% 0 9.09s 318 1,391
Combined Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
GPT-5.3-Codex 10.0 10.0 100.0% 0 19.56s 364 2,731
GPT-5.5 10.0 10.0 100.0% 0 19.29s 312 2,841
Data parsing and extraction Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
GPT-5.3-Codex 10.0 10.0 100.0% 0 3.07s 234 728
GPT-5.5 10.0 10.0 100.0% 0 4.18s 234 593
Domain specific Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
GPT-5.3-Codex 5.9 7.2 55.6% 1 64.31s 64 25,308
GPT-5.5 5.3 7.2 44.4% 1 164.14s 67 79,625
General Intelligence Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
GPT-5.3-Codex 4.6 10.0 0.0% 0 4.87s 187 331
GPT-5.5 10.0 10.0 100.0% 0 4.16s 138 223
Instructions following Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
GPT-5.3-Codex 10.0 10.0 100.0% 0 3.04s 93 693
GPT-5.5 10.0 10.0 100.0% 0 3.36s 93 538
Puzzle Solving Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
GPT-5.3-Codex 9.0 7.9 88.9% 1 5.12s 352 1,644
GPT-5.5 8.6 7.9 77.8% 1 6.78s 250 2,254
Tool Calling Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
GPT-5.3-Codex 10.0 10.0 100.0% 0 6.37s 254 492
GPT-5.5 10.0 10.0 100.0% 0 10.57s 258 832

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