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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 (high) benchmark comparison: Gemini 3.5 Flash (high) leads on average score with 9.8 vs 8.2. GPT-5.6 Terra (high) has the lower benchmark cost at $0.852 vs $1.115. Gemini 3.5 Flash (high) is faster at 8.84s vs 10.89s, with pass rates of 96.8% vs 68.3%.

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 high Release: 2026-07-09
Score 9.8 8.2
Rank #1 #29
Reliability 10.0 10.0
Consistency 9.6 9.6
Tests Correct
Attempt pass rate 96.8% 68.3%
Flaky tests 1 1
Total Runs 63 63
Cost per result 5.575 6.086
Total Cost $1.115 $0.852
Input Price $1.500 / 1M $2.500 / 1M
Output Price $9.000 / 1M $15.000 / 1M
Total Input Tokens 37,594 34,218
Output Tokens 1,975 1,908
Reasoning Tokens 115,638 49,189
Response Time (avg) 8.84s 10.89s
Response Time (max) 34.82s 91.49s
Response Time (total) 185.57s 228.65s

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

#29 GPT-5.6 Terra

high
Cost
$0.055
Time
30.2s
Tokens
3,748 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 2.54s 606 158 700
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 7.6 7.2 77.8% 1 9.14s 7,302 370 6,087
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 6.94s 11,019 314 627
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 938ms 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 10.0 33.3% 0 43.44s 723 70 32,942
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 5.1 10.0 0.0% 0 3.03s 477 113 216
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 2.14s 660 96 319
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 7.7 10.0 66.7% 0 5.45s 642 277 2,613
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 10.0 10.0 100.0% 0 4.97s 5,454 258 168
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 23.30s 195 30 5,517

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