Claude Sonnet 4.5
VS
DeepSeek V4 Pro
Claude Sonnet 4.5 vs DeepSeek V4 Pro: 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 wins 14 of 22 task areas we tested; Claude Sonnet 4.5 takes 8. DeepSeek V4 Pro costs 13.8× less per token ($1.305 vs $18 per 1M).
DeepSeek V4 Pro costs 13.8× less per token ($1.305 vs $18 per 1M).
Task by task
| Task area | Claude Sonnet 4.5 | DeepSeek V4 Pro | Winner |
|---|---|---|---|
| Product & Project Management |
#71
/ 110
Strong
|
#12
/ 110
Excellent
|
DeepSeek V4 Pro |
| Structured Output |
#80
/ 113
Strong
|
#23
/ 113
Excellent
|
DeepSeek V4 Pro |
| Summarization & Meeting Notes |
#2
/ 110
Excellent
|
#55
/ 110
Excellent
|
Claude Sonnet 4.5 |
| Chef / Home Cooking |
#80
/ 126
Usable
|
#32
/ 126
Usable
|
DeepSeek V4 Pro |
| Content & Brand |
#74
/ 124
Usable
|
#29
/ 124
Strong
|
DeepSeek V4 Pro |
| Sales |
#10
/ 110
Strong
|
#44
/ 110
Usable
|
Claude Sonnet 4.5 |
| Legal & HR |
#69
/ 110
Strong
|
#40
/ 110
Excellent
|
DeepSeek V4 Pro |
| Data & Analytics |
#33
/ 110
Excellent
|
#60
/ 110
Excellent
|
Claude Sonnet 4.5 |
| Frontend & Landing Pages |
#29
/ 109
Needs editing
|
#6
/ 109
Usable
|
DeepSeek V4 Pro |
| Coding |
#62
/ 115
Strong
|
#43
/ 115
Strong
|
DeepSeek V4 Pro |
| Creative & Comedy | #66 / 110 | #50 / 110 | DeepSeek V4 Pro |
| Landing Pages |
#30
/ 72
Strong
|
#16
/ 72
Strong
|
DeepSeek V4 Pro |
| Presentations & Decks |
#43
/ 110
Excellent
|
#31
/ 110
Excellent
|
DeepSeek V4 Pro |
| RAG, Safety & Grounding |
#39
/ 113
Excellent
|
#27
/ 113
Excellent
|
DeepSeek V4 Pro |
| Training & Education |
#51
/ 110
Excellent
|
#41
/ 110
Excellent
|
DeepSeek V4 Pro |
| Customer Support |
#43
/ 113
Strong
|
#52
/ 113
Strong
|
Claude Sonnet 4.5 |
| Investor & Pitch |
#42
/ 66
Usable
|
#33
/ 66
Strong
|
DeepSeek V4 Pro |
| Executive Assistant |
#31
/ 112
Strong
|
#38
/ 112
Strong
|
Claude Sonnet 4.5 |
| Translation & Localization |
#25
/ 110
Excellent
|
#32
/ 110
Excellent
|
Claude Sonnet 4.5 |
| Research & Competitive Analysis |
#39
/ 110
Strong
|
#44
/ 110
Strong
|
Claude Sonnet 4.5 |
| Knowledge & Docs |
#28
/ 110
Strong
|
#25
/ 110
Strong
|
DeepSeek V4 Pro |
| AI Strategy |
#67
/ 126
Strong
|
#68
/ 126
Strong
|
Claude Sonnet 4.5 |
Rank = position among every model config we tested in that task area (lower is better). Sorted by biggest gap first.
Frequently asked
Is Claude Sonnet 4.5 better than DeepSeek V4 Pro?
Across 22 task areas we benchmarked, DeepSeek V4 Pro ranks higher in 14 and Claude Sonnet 4.5 in 8.
Which is cheaper, Claude Sonnet 4.5 or DeepSeek V4 Pro?
DeepSeek V4 Pro costs 13.8× less per token ($1.305 vs $18 per 1M).
What is Claude Sonnet 4.5 better at?
Claude Sonnet 4.5 out-ranks DeepSeek V4 Pro at Summarization & Meeting Notes, Sales, Data & Analytics.
What is DeepSeek V4 Pro better at?
DeepSeek V4 Pro out-ranks Claude Sonnet 4.5 at Product & Project Management, Structured Output, Chef / Home Cooking.
More comparisons
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Prompt × model results
12 test cases · 3 evals