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

Last updated at: 2026-06-01

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 7.7 7.4
Rank #40 #57
Reliability 10.0 10.0
Consistency 9.6 8.4
Tests Correct
Attempt pass rate 68.3% 68.3%
Flaky tests 1 4
Total Runs 60 60
Cost per result 2.750 3.350
Total Cost $0.358 $0.402
Input Price $0.300 / 1M $1.750 / 1M
Output Price $2.500 / 1M $14.000 / 1M
Output Tokens 1,924 24,757
Reasoning Tokens 137,255 0
Response Time (avg) 15.57s 6.13s
Response Time (max) 95.48s 18.33s
Response Time (total) 311.47s 122.61s

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) 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 6.6 10.0 50.0% 0 54.56s 537 24,413
GPT-5.3 Chat 6.9 6.2 66.7% 1 10.52s 4,772 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 9.8 10.0 100.0% 0 3.51s 1,491 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 3.18s 126 2,499
GPT-5.3 Chat 10.0 10.0 100.0% 0 2.99s 1,758 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
Trivia Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 2.5 Flash 3.0 10.0 0.0% 0 2.76s 11 919
GPT-5.3 Chat 3.0 10.0 0.0% 0 4.38s 569 0

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