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Google: Gemini 2.5 Flash vs OpenAI: GPT-5.3 Chat

Last updated at: 2026-04-16

Metric Gemini 2.5 Flash Gemini 2.5 Flash medium Release: 2025-06-17 GPT-5.3 Chat GPT-5.3 Chat none Release: 2026-03-03
Score 8.2 7.7
Rank #15 #35
Consistency 9.5 8.6
Tests Correct
Attempt pass rate 75.9% 68.5%
Flaky tests 1 3
Total Runs 54 54
Cost per result 2.454 3.082
Total Cost $0.319 $0.340
Input Price $0.300 / 1M $1.750 / 1M
Output Price $2.500 / 1M $14.000 / 1M
Output Tokens 1,898 20,784
Reasoning Tokens 122,273 0
Response Time (avg) 12.12s 5.88s
Response Time (max) 95.48s 18.33s
Response Time (total) 218.12s 105.90s

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Category Breakdown

Anti-AI Tricks Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 2.5 Flash 8.4 10.0 75.0% 0 6.30s 255 10,233
GPT-5.3 Chat 6.7 8.1 58.3% 1 3.86s 3,167 0
Coding Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 2.5 Flash 10.0 10.0 100.0% 0 16.23s 522 10,350
GPT-5.3 Chat 10.0 10.0 100.0% 0 9.32s 1,436 0
Combined Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 2.5 Flash 10.0 10.0 100.0% 0 28.44s 303 11,922
GPT-5.3 Chat 10.0 10.0 100.0% 0 11.96s 2,614 0
Data parsing and extraction Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 2.5 Flash 10.0 10.0 100.0% 0 4.06s 279 2,325
GPT-5.3 Chat 10.0 10.0 100.0% 0 2.21s 942 0
Domain specific Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 2.5 Flash 5.9 7.2 55.6% 1 37.34s 18 80,702
GPT-5.3 Chat 3.5 4.4 33.3% 2 13.01s 8,264 0
General Intelligence Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 2.5 Flash 4.8 10.0 0.0% 0 4.86s 92 1,899
GPT-5.3 Chat 4.6 10.0 0.0% 0 1.99s 319 0
Instructions following Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 2.5 Flash 9.8 10.0 100.0% 0 2.62s 69 1,203
GPT-5.3 Chat 8.3 10.0 50.0% 0 3.29s 1,455 0
Puzzle Solving Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 2.5 Flash 7.7 10.0 66.7% 0 3.94s 126 2,499
GPT-5.3 Chat 10.0 10.0 100.0% 0 2.93s 1,726 0
Tool Calling Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 2.5 Flash 10.0 10.0 100.0% 0 6.20s 234 1,140
GPT-5.3 Chat 10.0 10.0 100.0% 0 8.36s 861 0

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