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Google: Gemini 3 Flash Preview vs OpenAI: GPT-5.3-Codex

Last updated at: 2026-05-29

Metric Gemini 3 Flash Preview Gemini 3 Flash Preview medium Release: 2025-12-17 GPT-5.3-Codex GPT-5.3-Codex medium Release: 2026-02-05
Score 9.8 8.3
Rank #1 #17
Reliability 10.0 10.0
Consistency 9.6 8.4
Tests Correct
Attempt pass rate 98.3% 81.7%
Flaky tests 1 4
Total Runs 60 60
Cost per result 2.980 4.887
Total Cost $0.567 $0.685
Input Price $0.500 / 1M $1.750 / 1M
Output Price $3.000 / 1M $14.000 / 1M
Output Tokens 2,000 2,336
Reasoning Tokens 181,033 42,565
Response Time (avg) 16.50s 15.95s
Response Time (max) 117.26s 100.93s
Response Time (total) 330.06s 319.08s

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Score vs Total Cost

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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
Gemini 3 Flash Preview 10.0 10.0 100.0% 0 3.88s 330 3,216
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 Flash Preview 7.9 6.4 83.3% 1 95.96s 456 127,964
GPT-5.3-Codex 10.0 10.0 100.0% 0 18.45s 514 7,266
Combined Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 3 Flash Preview 10.0 10.0 100.0% 0 22.42s 351 10,485
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 Flash Preview 10.0 10.0 100.0% 0 5.43s 279 4,893
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 Flash Preview 10.0 10.0 100.0% 0 15.27s 12 21,684
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 Flash Preview 10.0 10.0 100.0% 0 5.19s 72 1,905
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 Flash Preview 10.0 10.0 100.0% 0 4.04s 72 2,709
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 Flash Preview 10.0 10.0 100.0% 0 4.05s 183 4,365
GPT-5.3-Codex 9.0 7.9 88.9% 1 5.05s 356 1,593
Tool Calling Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 3 Flash Preview 10.0 10.0 100.0% 0 12.60s 234 1,487
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 Flash Preview 10.0 10.0 100.0% 0 5.50s 11 2,325
GPT-5.3-Codex 2.8 1.6 33.3% 1 14.43s 30 1,701

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