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Google: Gemini 3.5 Flash vs OpenAI: GPT-5.3-Codex

Last updated at: 2026-05-19

Metric Gemini 3.5 Flash Gemini 3.5 Flash medium Release: 2026-05-19 GPT-5.3-Codex GPT-5.3-Codex medium Release: 2026-02-05
Score 9.2 8.2
Rank #5 #17
Reliability 10.0 10.0
Consistency 10.0 8.3
Tests Correct
Attempt pass rate 89.5% 80.7%
Flaky tests 0 4
Total Runs 57 57
Cost per result 2.307 4.594
Total Cost $0.393 $0.598
Input Price $1.500 / 1M $1.750 / 1M
Output Price $9.000 / 1M $14.000 / 1M
Output Tokens 1,971 2,309
Reasoning Tokens 36,659 36,880
Response Time (avg) 3.90s 15.33s
Response Time (max) 12.05s 100.93s
Response Time (total) 74.13s 291.34s

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Category Breakdown

Anti-AI Tricks Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 3.5 Flash 10.0 10.0 100.0% 0 2.09s 171 3,385
GPT-5.3-Codex 8.7 7.9 91.7% 1 4.16s 240 1,722
Coding Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 3.5 Flash 10.0 10.0 100.0% 0 8.22s 431 5,190
GPT-5.3-Codex 10.0 10.0 100.0% 0 8.95s 491 1,530
Combined Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 3.5 Flash 10.0 10.0 100.0% 0 12.05s 351 7,807
GPT-5.3-Codex 10.0 10.0 100.0% 0 19.56s 364 2,731
Data parsing and extraction Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 3.5 Flash 10.0 10.0 100.0% 0 4.07s 279 3,784
GPT-5.3-Codex 10.0 10.0 100.0% 0 3.07s 234 728
Domain specific Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 3.5 Flash 7.7 10.0 66.7% 0 5.24s 12 8,047
GPT-5.3-Codex 5.9 7.2 55.6% 1 64.31s 64 25,308
General Intelligence Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 3.5 Flash 10.0 10.0 100.0% 0 2.52s 115 1,144
GPT-5.3-Codex 4.6 10.0 0.0% 0 4.87s 187 331
Instructions following Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 3.5 Flash 9.9 10.0 100.0% 0 2.70s 71 2,855
GPT-5.3-Codex 10.0 10.0 100.0% 0 3.04s 93 693
Puzzle Solving Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 3.5 Flash 7.7 10.0 66.7% 0 2.38s 295 2,747
GPT-5.3-Codex 9.0 7.9 88.9% 1 5.12s 352 1,644
Tool Calling Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 3.5 Flash 10.0 10.0 100.0% 0 3.81s 234 455
GPT-5.3-Codex 10.0 10.0 100.0% 0 6.37s 254 492
Trivia Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 3.5 Flash 10.0 10.0 100.0% 0 2.75s 12 1,245
GPT-5.3-Codex 2.8 1.6 33.3% 1 14.43s 30 1,701

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