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

Summary

Gemini 3.1 Flash Lite vs GPT-5.3-Codex benchmark comparison: GPT-5.3-Codex leads on average score with 8.9 vs 6.4. Gemini 3.1 Flash Lite has the lower benchmark cost at $0.028 vs $0.740. Gemini 3.1 Flash Lite is faster at 1.89s vs 16.22s, with pass rates of 61.9% vs 82.5%.

Recommended model: Gemini 3.1 Flash Lite - It offers the best overall trade-off: a competitive score (6.4), lower cost than GPT-5.3-Codex, and balanced response time.

Last updated at: 2026-06-18

Metric Gemini 3.1 Flash Lite Gemini 3.1 Flash Lite low Release: 2026-05-08 GPT-5.3-Codex GPT-5.3-Codex medium Release: 2026-02-05
Score 6.4 8.9
Rank #85 #10
Reliability 10.0 10.0
Consistency 9.3 8.5
Tests Correct
Attempt pass rate 61.9% 82.5%
Flaky tests 2 4
Total Runs 63 63
Cost per result 0.227 4.932
Total Cost $0.028 $0.740
Input Price $0.250 / 1M $1.750 / 1M
Output Price $1.500 / 1M $14.000 / 1M
Total Input Tokens 36,892 34,299
Output Tokens 2,732 2,357
Reasoning Tokens 9,260 46,189
Response Time (avg) 1.89s 16.22s
Response Time (max) 5.66s 100.93s
Response Time (total) 39.62s 340.67s

Generation showcase

Hamster playing table tennis

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

#85 Gemini 3.1 Flash Lite

low
Cost
$0.003
Time
4.0s
Tokens
1,479 tok

#10 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 3.1 Flash Lite 7.3 6.2 75.0% 2 1.84s 500 1,013 1,548
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 3.1 Flash Lite 5.5 10.0 33.3% 0 1.53s 8,132 471 1,072
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 3.1 Flash Lite 3.0 10.0 0.0% 0 4.48s 12,870 348 975
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 3.1 Flash Lite 10.0 10.0 100.0% 0 1.44s 7,453 291 697
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 3.1 Flash Lite 5.3 10.0 33.3% 0 1.52s 639 15 1,214
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 3.1 Flash Lite 4.0 10.0 0.0% 0 1.37s 492 69 438
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 3.1 Flash Lite 10.0 10.0 100.0% 0 1.52s 619 72 760
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 3.1 Flash Lite 10.0 10.0 100.0% 0 1.40s 570 210 1,191
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 3.1 Flash Lite 10.0 10.0 100.0% 0 5.66s 5,457 234 945
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 3.1 Flash Lite 3.0 10.0 0.0% 0 1.46s 160 9 420
GPT-5.3-Codex 2.8 1.6 33.3% 1 14.43s 195 30 1,701

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