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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 (medium) benchmark comparison: Gemini 3.5 Flash (high) leads on average score with 9.8 vs 7.8. GPT-5.6 Terra (medium) has the lower benchmark cost at $0.496 vs $1.115. GPT-5.6 Terra (medium) is faster at 6.69s vs 8.84s, 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 medium Release: 2026-07-09
Score 9.8 7.8
Rank #1 #37
Reliability 10.0 10.0
Consistency 9.6 9.2
Tests Correct
Attempt pass rate 96.8% 68.3%
Flaky tests 1 2
Total Runs 63 63
Cost per result 5.575 3.815
Total Cost $1.115 $0.496
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 1,982
Reasoning Tokens 115,638 25,370
Response Time (avg) 8.84s 6.69s
Response Time (max) 34.82s 41.68s
Response Time (total) 185.57s 140.49s

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

#37 GPT-5.6 Terra

medium
Cost
$0.035
Time
16.3s
Tokens
2,418 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 2.22s 606 172 657
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 6.1 7.2 55.6% 1 7.19s 7,302 427 4,527
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 6.26s 11,019 316 540
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 872ms 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 23.45s 723 70 15,327
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 5.5 10.0 0.0% 0 2.37s 477 133 144
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 1.43s 660 89 261
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 8.4 7.4 88.9% 1 3.78s 642 272 1,462
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 5.09s 5,454 254 246
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 10.05s 195 27 2,206

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