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Qwen: Qwen3.5-Flash vs Qwen: Qwen3.5 Plus 2026-02-15

Summary

Qwen3.5-Flash vs Qwen3.5 Plus 2026-02-15 benchmark comparison: Qwen3.5-Flash leads on average score with 6.1 vs 5.8. Qwen3.5-Flash has the lower benchmark cost at $0.005 vs $0.016. Qwen3.5 Plus 2026-02-15 is faster at 2.31s vs 3.58s, with pass rates of 39.7% vs 46.0%.

Recommended model: Qwen3.5-Flash - It has the best score here (6.1), while costing about 3.8x less than Qwen3.5 Plus 2026-02-15.

Last updated at: 2026-06-18

Metric Qwen3.5-Flash Qwen3.5-Flash none Release: 2026-02-24 Qwen3.5 Plus 2026-02-15 Qwen3.5 Plus 2026-02-15 none Release: 2026-02-15
Score 6.1 5.8
Rank #97 #106
Reliability 10.0 10.0
Consistency 9.7 9.4
Tests Correct
Attempt pass rate 39.7% 46.0%
Flaky tests 1 2
Total Runs 63 63
Cost per result 0.075 0.204
Total Cost $0.005 $0.016
Input Price $0.065 / 1M $0.260 / 1M
Output Price $0.260 / 1M $1.560 / 1M
Total Input Tokens 46,439 45,864
Output Tokens 4,276 2,480
Reasoning Tokens 0 0
Response Time (avg) 3.58s 2.31s
Response Time (max) 27.18s 6.65s
Response Time (total) 75.28s 34.63s

Generation showcase

Hamster playing table tennis

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

#97 Qwen3.5-Flash

none
Cost
$0.003
Time
47.4s
Tokens
7,799 tok

#106 Qwen3.5 Plus 2026-02-15

none
Cost
$0.012
Time
153.2s
Tokens
7,787 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
Qwen3.5-Flash 3.5 8.3 8.3% 1 1.32s 696 690 0
Qwen3.5 Plus 2026-02-15 4.8 10.0 25.0% 0 1.91s 696 517 0
Coding Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Qwen3.5-Flash 5.5 10.0 33.3% 0 850ms 7,913 519 0
Qwen3.5 Plus 2026-02-15 4.3 7.9 11.1% 1 2.05s 7,913 473 0
Combined Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Qwen3.5-Flash 3.0 10.0 0.0% 0 6.22s 18,879 1,794 0
Qwen3.5 Plus 2026-02-15 3.0 10.0 0.0% 0 6.65s 18,304 314 0
Data parsing and extraction Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Qwen3.5-Flash 10.0 10.0 100.0% 0 1.57s 7,794 243 0
Qwen3.5 Plus 2026-02-15 10.0 10.0 100.0% 0 1.89s 7,794 243 0
Domain specific Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Qwen3.5-Flash 7.7 10.0 66.7% 0 905ms 789 15 0
Qwen3.5 Plus 2026-02-15 5.3 10.0 33.3% 0 1.17s 789 17 0
General Intelligence Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Qwen3.5-Flash 10.0 10.0 100.0% 0 803ms 522 100 0
Qwen3.5 Plus 2026-02-15 4.4 3.0 33.3% 1 2.26s 522 117 0
Instructions following Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Qwen3.5-Flash 6.3 10.0 50.0% 0 8.81s 711 63 0
Qwen3.5 Plus 2026-02-15 10.0 10.0 100.0% 0 1.67s 711 72 0
Puzzle Solving Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Qwen3.5-Flash 3.1 10.0 0.0% 0 10.89s 714 579 0
Qwen3.5 Plus 2026-02-15 7.7 10.0 66.7% 0 2.71s 714 494 0
Tool Calling Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Qwen3.5-Flash 10.0 10.0 100.0% 0 3.67s 8,211 264 0
Qwen3.5 Plus 2026-02-15 10.0 10.0 100.0% 0 3.33s 8,211 222 0
Trivia Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Qwen3.5-Flash 3.0 10.0 0.0% 0 588ms 210 9 0
Qwen3.5 Plus 2026-02-15 3.0 10.0 0.0% 0 1.11s 210 11 0

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