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Google: Gemini 3.5 Flash vs OpenAI: GPT-5.6 Terra

Summary

Gemini 3.5 Flash (high) vs GPT-5.6 Terra (low) benchmark comparison: Gemini 3.5 Flash (high) leads on average score with 9.8 vs 7.7. GPT-5.6 Terra (low) has the lower benchmark cost at $0.343 vs $1.115. GPT-5.6 Terra (low) is faster at 4.88s vs 8.84s, with pass rates of 96.8% vs 74.6%.

Recommended model: Gemini 3.5 Flash (high) - It has the strongest score in this comparison (9.8) and the best overall balance of cost and response time across all 2 models.

Last updated at: 2026-07-09

Metric Gemini 3.5 Flash Gemini 3.5 Flash high Release: 2026-05-19 GPT-5.6 Terra GPT-5.6 Terra low Release: 2026-07-09
Score 9.8 7.7
Rank #1 #47
Reliability 10.0 10.0
Consistency 9.6 8.1
Tests Correct
Attempt pass rate 96.8% 74.6%
Flaky tests 1 5
Total Runs 63 63
Cost per result 5.575 2.637
Total Cost $1.115 $0.343
Input Price $1.500 / 1M $2.500 / 1M
Output Price $9.000 / 1M $15.000 / 1M
Total Input Tokens 37,594 34,226
Output Tokens 1,975 1,943
Reasoning Tokens 115,638 15,201
Response Time (avg) 8.84s 4.88s
Response Time (max) 34.82s 19.85s
Response Time (total) 185.57s 102.53s

Generation showcase

Hamster playing table tennis

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

#1 Gemini 3.5 Flash

high
Cost
$0.208
Time
118.2s
Tokens
23,158 tok

#47 GPT-5.6 Terra

low
Cost
$0.034
Time
16.8s
Tokens
2,348 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 3.5 Flash 10.0 10.0 100.0% 0 2.57s 492 174 4,997
GPT-5.6 Terra 8.3 10.0 75.0% 0 2.36s 606 171 602
Coding Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 3.5 Flash 10.0 10.0 100.0% 0 22.96s 8,118 456 47,129
GPT-5.6 Terra 6.6 4.6 77.8% 2 9.56s 7,302 429 6,821
Combined Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 3.5 Flash 10.0 10.0 100.0% 0 22.37s 12,873 351 16,323
GPT-5.6 Terra 10.0 10.0 100.0% 0 5.07s 11,019 312 349
Data parsing and extraction Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 3.5 Flash 10.0 10.0 100.0% 0 6.43s 7,548 279 8,466
GPT-5.6 Terra 10.0 10.0 100.0% 0 919ms 7,140 222 0
Domain specific Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 3.5 Flash 7.6 7.2 77.8% 1 14.09s 633 12 24,721
GPT-5.6 Terra 5.3 7.2 44.4% 1 8.34s 723 72 4,086
General Intelligence Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 3.5 Flash 10.0 10.0 100.0% 0 3.63s 486 115 1,650
GPT-5.6 Terra 4.8 3.2 33.3% 1 3.52s 477 105 249
Instructions following Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 3.5 Flash 10.0 10.0 100.0% 0 3.35s 615 70 3,799
GPT-5.6 Terra 10.0 10.0 100.0% 0 1.48s 660 87 134
Puzzle Solving Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 3.5 Flash 10.0 10.0 100.0% 0 3.23s 558 241 4,940
GPT-5.6 Terra 10.0 10.0 100.0% 0 4.46s 642 259 1,506
Tool Calling Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 3.5 Flash 9.8 10.0 100.0% 0 4.96s 6,115 265 1,608
GPT-5.6 Terra 4.7 1.6 66.7% 1 6.69s 5,462 257 226
Trivia Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 3.5 Flash 10.0 10.0 100.0% 0 3.94s 156 12 2,005
GPT-5.6 Terra 3.0 10.0 0.0% 0 5.95s 195 29 1,228

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