DeepSeek V4 Pro
VS
Gemini 3.5 Flash
DeepSeek V4 Pro vs Gemini 3.5 Flash: 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.
Gemini 3.5 Flash wins 14 of 22 task areas we tested; DeepSeek V4 Pro takes 8. DeepSeek V4 Pro costs 8.0× less per token ($1.305 vs $10.5 per 1M).
DeepSeek V4 Pro costs 8.0× less per token ($1.305 vs $10.5 per 1M).
Task by task
| Task area | DeepSeek V4 Pro | Gemini 3.5 Flash | Winner |
|---|---|---|---|
| AI Strategy |
#68
/ 126
Strong
|
#23
/ 126
Strong
|
Gemini 3.5 Flash |
| Customer Support |
#52
/ 113
Strong
|
#12
/ 113
Strong
|
Gemini 3.5 Flash |
| Summarization & Meeting Notes |
#55
/ 110
Excellent
|
#17
/ 110
Excellent
|
Gemini 3.5 Flash |
| Training & Education |
#41
/ 110
Excellent
|
#7
/ 110
Excellent
|
Gemini 3.5 Flash |
| Legal & HR |
#40
/ 110
Excellent
|
#73
/ 110
Strong
|
DeepSeek V4 Pro |
| Data & Analytics |
#60
/ 110
Excellent
|
#34
/ 110
Excellent
|
Gemini 3.5 Flash |
| Landing Pages |
#16
/ 72
Strong
|
#40
/ 72
Strong
|
DeepSeek V4 Pro |
| Creative & Comedy | #50 / 110 | #27 / 110 | Gemini 3.5 Flash |
| Investor & Pitch |
#33
/ 66
Strong
|
#56
/ 66
Usable
|
DeepSeek V4 Pro |
| Product & Project Management |
#12
/ 110
Excellent
|
#33
/ 110
Strong
|
DeepSeek V4 Pro |
| Research & Competitive Analysis |
#44
/ 110
Strong
|
#65
/ 110
Usable
|
DeepSeek V4 Pro |
| Executive Assistant |
#38
/ 112
Strong
|
#19
/ 112
Strong
|
Gemini 3.5 Flash |
| Knowledge & Docs |
#25
/ 110
Strong
|
#44
/ 110
Strong
|
DeepSeek V4 Pro |
| Content & Brand |
#29
/ 124
Strong
|
#46
/ 124
Strong
|
DeepSeek V4 Pro |
| Coding |
#43
/ 115
Strong
|
#28
/ 115
Strong
|
Gemini 3.5 Flash |
| Presentations & Decks |
#31
/ 110
Excellent
|
#17
/ 110
Excellent
|
Gemini 3.5 Flash |
| RAG, Safety & Grounding |
#27
/ 113
Excellent
|
#15
/ 113
Excellent
|
Gemini 3.5 Flash |
| Structured Output |
#23
/ 113
Excellent
|
#35
/ 113
Excellent
|
DeepSeek V4 Pro |
| Sales |
#44
/ 110
Usable
|
#33
/ 110
Strong
|
Gemini 3.5 Flash |
| Chef / Home Cooking |
#32
/ 126
Usable
|
#24
/ 126
Usable
|
Gemini 3.5 Flash |
| Frontend & Landing Pages |
#6
/ 109
Usable
|
#4
/ 109
Usable
|
Gemini 3.5 Flash |
| Translation & Localization |
#32
/ 110
Excellent
|
#30
/ 110
Excellent
|
Gemini 3.5 Flash |
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 Gemini 3.5 Flash?
Across 22 task areas we benchmarked, Gemini 3.5 Flash ranks higher in 14 and DeepSeek V4 Pro in 8.
Which is cheaper, DeepSeek V4 Pro or Gemini 3.5 Flash?
DeepSeek V4 Pro costs 8.0× less per token ($1.305 vs $10.5 per 1M).
What is DeepSeek V4 Pro better at?
DeepSeek V4 Pro out-ranks Gemini 3.5 Flash at Legal & HR, Landing Pages, Investor & Pitch.
What is Gemini 3.5 Flash better at?
Gemini 3.5 Flash out-ranks DeepSeek V4 Pro at AI Strategy, Customer Support, Summarization & Meeting Notes.
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.
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- 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