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Google: Gemini 3.1 Flash Lite vs OpenAI: GPT-5.3-Codex

Last updated at: 2026-05-22

Metric Gemini 3.1 Flash Lite Gemini 3.1 Flash Lite high Release: 2026-05-08 GPT-5.3-Codex GPT-5.3-Codex medium Release: 2026-02-05
Score 7.5 8.3
Rank #48 #15
Reliability 9.8 10.0
Consistency 8.1 8.4
Tests Correct
Attempt pass rate 74.1% 81.7%
Flaky tests 4 4
Total Runs 54 60
Cost per result 18.579 4.891
Total Cost $2.044 $0.685
Input Price $0.250 / 1M $1.750 / 1M
Output Price $1.500 / 1M $14.000 / 1M
Output Tokens 1,984 2,332
Reasoning Tokens 1,355,583 42,616
Response Time (avg) 61.96s 15.97s
Response Time (max) 149.23s 100.93s
Response Time (total) 1115.31s 319.30s

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Score vs Response Time (avg)

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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 3.1 Flash Lite 9.4 10.0 100.0% 0 37.16s 100 130,598
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 3.1 Flash Lite 10.0 10.0 100.0% 0 137.63s 666 188,733
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 3.1 Flash Lite 10.0 10.0 100.0% 0 149.23s 327 198,243
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 3.1 Flash Lite 10.0 10.0 100.0% 0 4.49s 279 7,351
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 3.1 Flash Lite 3.6 7.2 22.2% 1 139.90s 18 566,210
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 3.1 Flash Lite 5.0 2.1 66.7% 1 45.69s 95 64,644
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 3.1 Flash Lite 7.3 5.8 83.3% 1 23.26s 52 3,549
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 3.1 Flash Lite 5.7 6.8 44.4% 1 50.83s 213 193,654
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 3.1 Flash Lite 10.0 10.0 100.0% 0 6.44s 234 2,601
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 3.1 Flash Lite - - - - - - - -
GPT-5.3-Codex 2.8 1.6 33.3% 1 14.43s 30 1,701

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