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Anthropic: Claude Opus 4.8 vs Google: Gemini 3.5 Flash

Summary

Claude Opus 4.8 vs Gemini 3.5 Flash benchmark comparison: Gemini 3.5 Flash leads on average score with 9.1 vs 7.7. Gemini 3.5 Flash has the lower benchmark cost at $0.582 vs $1.270. Gemini 3.5 Flash is faster at 4.94s vs 10.83s, with pass rates of 79.4% vs 87.3%.

Recommended model: Gemini 3.5 Flash - It has the best score here (9.1), while costing about 2.2x less than Claude Opus 4.8.

Last updated at: 2026-07-02

Metric Claude Opus 4.8 Claude Opus 4.8 low Release: 2026-05-28 Gemini 3.5 Flash Gemini 3.5 Flash medium Release: 2026-05-19
Score 7.7 9.1
Rank #38 #8
Reliability 10.0 10.0
Consistency 8.8 9.6
Tests Correct
Attempt pass rate 79.4% 87.3%
Flaky tests 3 1
Total Runs 63 63
Cost per result 8.466 3.229
Total Cost $1.270 $0.582
Input Price $5.000 / 1M $1.500 / 1M
Output Price $25.000 / 1M $9.000 / 1M
Total Input Tokens 60,946 36,936
Output Tokens 31,771 2,001
Reasoning Tokens 6,831 56,408
Response Time (avg) 10.83s 4.94s
Response Time (max) 127.97s 18.07s
Response Time (total) 227.39s 103.79s

Generation showcase

Hamster playing table tennis

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

#38 Claude Opus 4.8

low
Cost
$0.031
Time
14.1s
Tokens
1,345 tok

#8 Gemini 3.5 Flash

medium
Cost
$0.201
Time
112.9s
Tokens
22,371 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
Claude Opus 4.8 10.0 10.0 100.0% 0 3.30s 834 793 371
Gemini 3.5 Flash 10.0 10.0 100.0% 0 2.09s 492 171 3,385
Coding Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Claude Opus 4.8 6.6 4.6 77.8% 2 7.58s 10,590 3,637 809
Gemini 3.5 Flash 7.9 7.5 77.8% 1 12.63s 8,118 461 24,939
Combined Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Claude Opus 4.8 9.8 10.0 100.0% 0 20.84s 23,500 2,216 1,081
Gemini 3.5 Flash 10.0 10.0 100.0% 0 12.05s 12,873 351 7,807
Data parsing and extraction Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Claude Opus 4.8 6.3 5.8 66.7% 1 2.27s 10,503 310 0
Gemini 3.5 Flash 10.0 10.0 100.0% 0 4.07s 7,548 279 3,784
Domain specific Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Claude Opus 4.8 5.3 10.0 33.3% 0 45.53s 975 23,311 3,908
Gemini 3.5 Flash 7.7 10.0 66.7% 0 5.24s 633 12 8,047
General Intelligence Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Claude Opus 4.8 10.0 10.0 100.0% 0 2.55s 708 231 0
Gemini 3.5 Flash 10.0 10.0 100.0% 0 2.52s 486 115 1,144
Instructions following Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Claude Opus 4.8 9.8 10.0 100.0% 0 2.78s 909 111 221
Gemini 3.5 Flash 9.9 10.0 100.0% 0 2.70s 615 71 2,855
Puzzle Solving Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Claude Opus 4.8 10.0 10.0 100.0% 0 3.01s 894 592 184
Gemini 3.5 Flash 7.7 10.0 66.7% 0 2.38s 558 295 2,747
Tool Calling Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Claude Opus 4.8 10.0 10.0 100.0% 0 6.85s 11,775 370 35
Gemini 3.5 Flash 10.0 10.0 100.0% 0 3.81s 5,457 234 455
Trivia Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Claude Opus 4.8 3.0 10.0 0.0% 0 5.48s 258 200 222
Gemini 3.5 Flash 10.0 10.0 100.0% 0 2.75s 156 12 1,245

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