DeepSeek V4 Pro
VS
Qwen3.5 Plus 2026-02-15
DeepSeek V4 Pro vs Qwen3.5 Plus 2026-02-15: which wins at real work?
22 task areas · same graded test runs · rank comparison only, so 0–100 and Elo collections never mix raw scores.
DeepSeek V4 Pro and Qwen3.5 Plus 2026-02-15 split the 22 task areas we tested 11–11. DeepSeek V4 Pro costs 1.4× less per token ($1.305 vs $1.82 per 1M).
DeepSeek V4 Pro costs 1.4× less per token ($1.305 vs $1.82 per 1M).
Task by task
| Task area | DeepSeek V4 Pro | Qwen3.5 Plus 2026-02-15 | Winner |
|---|---|---|---|
| AI Strategy |
#68
/ 126
Strong
|
#32
/ 126
Strong
|
Qwen3.5 Plus 2026-02-15 |
| Training & Education |
#41
/ 110
Excellent
|
#6
/ 110
Excellent
|
Qwen3.5 Plus 2026-02-15 |
| Customer Support |
#52
/ 113
Strong
|
#18
/ 113
Strong
|
Qwen3.5 Plus 2026-02-15 |
| Data & Analytics |
#60
/ 110
Excellent
|
#26
/ 110
Excellent
|
Qwen3.5 Plus 2026-02-15 |
| Research & Competitive Analysis |
#44
/ 110
Strong
|
#73
/ 110
Usable
|
DeepSeek V4 Pro |
| Coding |
#43
/ 115
Strong
|
#71
/ 115
Strong
|
DeepSeek V4 Pro |
| Product & Project Management |
#12
/ 110
Excellent
|
#40
/ 110
Strong
|
DeepSeek V4 Pro |
| Legal & HR |
#40
/ 110
Excellent
|
#13
/ 110
Excellent
|
Qwen3.5 Plus 2026-02-15 |
| Knowledge & Docs |
#25
/ 110
Strong
|
#51
/ 110
Usable
|
DeepSeek V4 Pro |
| Executive Assistant |
#38
/ 112
Strong
|
#61
/ 112
Strong
|
DeepSeek V4 Pro |
| Translation & Localization |
#32
/ 110
Excellent
|
#10
/ 110
Excellent
|
Qwen3.5 Plus 2026-02-15 |
| Creative & Comedy | #50 / 110 | #71 / 110 | DeepSeek V4 Pro |
| Landing Pages |
#16
/ 72
Strong
|
#36
/ 72
Strong
|
DeepSeek V4 Pro |
| RAG, Safety & Grounding |
#27
/ 113
Excellent
|
#7
/ 113
Excellent
|
Qwen3.5 Plus 2026-02-15 |
| Sales |
#44
/ 110
Usable
|
#27
/ 110
Strong
|
Qwen3.5 Plus 2026-02-15 |
| Content & Brand |
#29
/ 124
Strong
|
#45
/ 124
Strong
|
DeepSeek V4 Pro |
| Presentations & Decks |
#31
/ 110
Excellent
|
#40
/ 110
Excellent
|
DeepSeek V4 Pro |
| Summarization & Meeting Notes |
#55
/ 110
Excellent
|
#46
/ 110
Excellent
|
Qwen3.5 Plus 2026-02-15 |
| Chef / Home Cooking |
#32
/ 126
Usable
|
#40
/ 126
Usable
|
DeepSeek V4 Pro |
| Structured Output |
#23
/ 113
Excellent
|
#18
/ 113
Excellent
|
Qwen3.5 Plus 2026-02-15 |
| Frontend & Landing Pages |
#6
/ 109
Usable
|
#3
/ 109
Usable
|
Qwen3.5 Plus 2026-02-15 |
| Investor & Pitch |
#33
/ 66
Strong
|
#36
/ 66
Usable
|
DeepSeek V4 Pro |
Rank = position among every model config we tested in that task area (lower is better). Sorted by biggest gap first.
Frequently asked
Is DeepSeek V4 Pro better than Qwen3.5 Plus 2026-02-15?
They tie across the 22 task areas we benchmarked, at 11 apiece.
Which is cheaper, DeepSeek V4 Pro or Qwen3.5 Plus 2026-02-15?
DeepSeek V4 Pro costs 1.4× less per token ($1.305 vs $1.82 per 1M).
What is DeepSeek V4 Pro better at?
DeepSeek V4 Pro out-ranks Qwen3.5 Plus 2026-02-15 at Research & Competitive Analysis, Coding, Product & Project Management.
What is Qwen3.5 Plus 2026-02-15 better at?
Qwen3.5 Plus 2026-02-15 out-ranks DeepSeek V4 Pro at AI Strategy, Training & Education, Customer Support.
More comparisons
This page is Spring Prompt, running in public
We just did this for every model. Do it for your prompt.
The rankings above come from running real tasks through real models and scoring every output. Spring Prompt is that same engine — pointed at your prompt, your test cases, and your definition of good.
- Generate test cases from your prompt — no eval set required to start.
- Compare models side by side with quality, cost and latency in one matrix.
- Optimise the winner until the scores say it's ready to ship.
Prompt × model results
12 test cases · 3 evals