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

Summary

Gemini 3.5 Flash (medium) vs GPT-5.3-Codex (medium) benchmark comparison: Gemini 3.5 Flash (medium) leads on average score with 9.1 vs 8.9. Gemini 3.5 Flash (medium) has the lower benchmark cost at $0.582 vs $0.740. Gemini 3.5 Flash (medium) is faster at 4.94s vs 16.22s, with pass rates of 87.3% vs 82.5%.

Recommended model: Gemini 3.5 Flash (medium) - It has the best score here (9.1), while responding about 3.3x faster than GPT-5.3-Codex (medium).

Last updated at: 2026-07-09

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 9.1 8.9
Rank #11 #13
Reliability 10.0 10.0
Consistency 9.6 8.5
Tests Correct
Attempt pass rate 87.3% 82.5%
Flaky tests 1 4
Total Runs 63 63
Cost per result 3.229 4.932
Total Cost $0.582 $0.740
Input Price $1.500 / 1M $1.750 / 1M
Output Price $9.000 / 1M $14.000 / 1M
Total Input Tokens 36,936 34,299
Output Tokens 2,001 2,357
Reasoning Tokens 56,408 46,189
Response Time (avg) 4.94s 16.22s
Response Time (max) 18.07s 100.93s
Response Time (total) 103.79s 340.67s

Generation showcase

Hamster playing table tennis

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

#11 Gemini 3.5 Flash

medium
Cost
$0.201
Time
112.9s
Tokens
22,371 tok

#13 GPT-5.3-Codex

medium
Cost
$0.049
Time
54.9s
Tokens
3,580 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
Gemini 3.5 Flash 10.0 10.0 100.0% 0 2.09s 492 171 3,385
GPT-5.3-Codex 8.7 7.9 91.7% 1 4.16s 606 240 1,722
Coding Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 3.5 Flash 7.9 7.5 77.8% 1 12.63s 8,118 461 24,939
GPT-5.3-Codex 10.0 10.0 100.0% 0 19.50s 7,302 535 10,890
Combined Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 3.5 Flash 10.0 10.0 100.0% 0 12.05s 12,873 351 7,807
GPT-5.3-Codex 10.0 10.0 100.0% 0 19.56s 11,019 364 2,731
Data parsing and extraction Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 3.5 Flash 10.0 10.0 100.0% 0 4.07s 7,548 279 3,784
GPT-5.3-Codex 10.0 10.0 100.0% 0 3.07s 7,140 234 728
Domain specific Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 3.5 Flash 7.7 10.0 66.7% 0 5.24s 633 12 8,047
GPT-5.3-Codex 5.9 7.2 55.6% 1 64.31s 813 64 25,308
General Intelligence Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 3.5 Flash 10.0 10.0 100.0% 0 2.52s 486 115 1,144
GPT-5.3-Codex 4.6 10.0 0.0% 0 4.87s 477 187 331
Instructions following Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 3.5 Flash 9.9 10.0 100.0% 0 2.70s 615 71 2,855
GPT-5.3-Codex 10.0 10.0 100.0% 0 3.04s 660 93 693
Puzzle Solving Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 3.5 Flash 7.7 10.0 66.7% 0 2.38s 558 295 2,747
GPT-5.3-Codex 9.0 7.9 88.9% 1 5.05s 642 356 1,593
Tool Calling Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 3.5 Flash 10.0 10.0 100.0% 0 3.81s 5,457 234 455
GPT-5.3-Codex 10.0 10.0 100.0% 0 6.37s 5,445 254 492
Trivia Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 3.5 Flash 10.0 10.0 100.0% 0 2.75s 156 12 1,245
GPT-5.3-Codex 2.8 1.6 33.3% 1 14.43s 195 30 1,701

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