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

Summary

Gemini 3.1 Flash Lite Preview vs GPT-5.3-Codex benchmark comparison: GPT-5.3-Codex leads on average score with 8.9 vs 6.5. Gemini 3.1 Flash Lite Preview has the lower benchmark cost at $0.026 vs $0.740. Gemini 3.1 Flash Lite Preview is faster at 2.77s vs 16.22s, with pass rates of 61.9% vs 82.5%.

Recommended model: Gemini 3.1 Flash Lite Preview - It offers the best overall trade-off: a competitive score (6.5), lower cost than GPT-5.3-Codex, and balanced response time.

Last updated at: 2026-06-18

Metric Gemini 3.1 Flash Lite Preview Gemini 3.1 Flash Lite Preview low Release: 2026-03-03 GPT-5.3-Codex GPT-5.3-Codex medium Release: 2026-02-05
Score 6.5 8.9
Rank #82 #10
Reliability 10.0 10.0
Consistency 10.0 8.5
Tests Correct
Attempt pass rate 61.9% 82.5%
Flaky tests 0 4
Total Runs 63 63
Cost per result 0.196 4.932
Total Cost $0.026 $0.740
Input Price $0.250 / 1M $1.750 / 1M
Output Price $1.500 / 1M $14.000 / 1M
Total Input Tokens 32,715 34,299
Output Tokens 2,286 2,357
Reasoning Tokens 9,166 46,189
Response Time (avg) 2.77s 16.22s
Response Time (max) 11.91s 100.93s
Response Time (total) 58.12s 340.67s

Generation showcase

Hamster playing table tennis

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

#82 Gemini 3.1 Flash Lite Preview

low
Cost
$0.002
Time
3.7s
Tokens
1,203 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 Preview 8.3 10.0 75.0% 0 2.12s 506 462 1,638
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 Preview 5.5 10.0 33.3% 0 1.39s 8,138 660 1,060
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 Preview 3.0 10.0 0.0% 0 11.91s 8,381 225 762
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 Preview 10.0 10.0 100.0% 0 3.00s 7,455 291 696
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 Preview 5.3 10.0 33.3% 0 2.36s 641 18 1,212
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 Preview 4.0 10.0 0.0% 0 1.54s 490 69 384
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 Preview 10.0 10.0 100.0% 0 1.49s 621 72 753
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 Preview 10.0 10.0 100.0% 0 1.69s 566 243 1,248
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 Preview 10.0 10.0 100.0% 0 9.54s 5,757 237 993
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 Preview 3.0 10.0 0.0% 0 1.35s 160 9 420
GPT-5.3-Codex 2.8 1.6 33.3% 1 14.43s 195 30 1,701

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