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DeepSeek: DeepSeek V4 Flash vs Qwen: Qwen3.5-Flash

Summary

DeepSeek V4 Flash vs Qwen3.5-Flash benchmark comparison: Qwen3.5-Flash leads on average score with 6.1 vs 5.5. Qwen3.5-Flash has the lower benchmark cost at $0.005 vs $0.007. Qwen3.5-Flash is faster at 3.58s vs 26.75s, with pass rates of 30.2% vs 39.7%.

Recommended model: Qwen3.5-Flash - It has the best score here (6.1), while costing about 1.7x less than DeepSeek V4 Flash.

Last updated at: 2026-06-18

Metric DeepSeek V4 Flash DeepSeek V4 Flash none Release: 2026-04-24 Qwen3.5-Flash Qwen3.5-Flash none Release: 2026-02-24
Score 5.5 6.1
Rank #117 #97
Reliability 10.0 10.0
Consistency 8.9 9.7
Tests Correct
Attempt pass rate 30.2% 39.7%
Flaky tests 3 1
Total Runs 63 63
Cost per result 0.203 0.075
Total Cost $0.007 $0.005
Input Price $0.090 / 1M $0.065 / 1M
Output Price $0.180 / 1M $0.260 / 1M
Total Input Tokens 50,127 46,439
Output Tokens 13,710 4,276
Reasoning Tokens 0 0
Response Time (avg) 26.75s 3.58s
Response Time (max) 111.96s 27.18s
Response Time (total) 561.82s 75.28s

Generation showcase

Hamster playing table tennis

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

#117 DeepSeek V4 Flash

none
Cost
$0.004
Time
157.6s
Tokens
11,297 tok

#97 Qwen3.5-Flash

none
Cost
$0.003
Time
47.4s
Tokens
7,799 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
DeepSeek V4 Flash 3.0 10.0 0.0% 0 20.18s 540 174 0
Qwen3.5-Flash 3.5 8.3 8.3% 1 1.32s 696 690 0
Coding Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
DeepSeek V4 Flash 4.2 7.4 11.1% 1 17.13s 7,279 9,717 0
Qwen3.5-Flash 5.5 10.0 33.3% 0 850ms 7,913 519 0
Combined Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
DeepSeek V4 Flash 4.5 2.1 66.7% 1 111.96s 24,398 2,664 0
Qwen3.5-Flash 3.0 10.0 0.0% 0 6.22s 18,879 1,794 0
Data parsing and extraction Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
DeepSeek V4 Flash 10.0 10.0 100.0% 0 23.79s 7,290 195 0
Qwen3.5-Flash 10.0 10.0 100.0% 0 1.57s 7,794 243 0
Domain specific Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
DeepSeek V4 Flash 5.3 10.0 33.3% 0 19.73s 666 18 0
Qwen3.5-Flash 7.7 10.0 66.7% 0 905ms 789 15 0
General Intelligence Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
DeepSeek V4 Flash 4.2 9.9 0.0% 0 23.74s 471 67 0
Qwen3.5-Flash 10.0 10.0 100.0% 0 803ms 522 100 0
Instructions following Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
DeepSeek V4 Flash 6.5 10.0 50.0% 0 17.54s 627 321 0
Qwen3.5-Flash 6.3 10.0 50.0% 0 8.81s 711 63 0
Puzzle Solving Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
DeepSeek V4 Flash 3.1 7.3 11.1% 1 23.72s 594 207 0
Qwen3.5-Flash 3.1 10.0 0.0% 0 10.89s 714 579 0
Tool Calling Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
DeepSeek V4 Flash 10.0 10.0 100.0% 0 77.93s 8,079 327 0
Qwen3.5-Flash 10.0 10.0 100.0% 0 3.67s 8,211 264 0
Trivia Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
DeepSeek V4 Flash 3.0 10.0 0.0% 0 3.07s 183 20 0
Qwen3.5-Flash 3.0 10.0 0.0% 0 588ms 210 9 0

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