DeepSeek V3.1 Terminus
VS
GPT-5.5
DeepSeek V3.1 Terminus vs GPT-5.5: 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.
GPT-5.5 wins 21 of 22 task areas we tested; DeepSeek V3.1 Terminus takes 1. DeepSeek V3.1 Terminus costs 28.7× less per token ($1.22 vs $35 per 1M).
DeepSeek V3.1 Terminus costs 28.7× less per token ($1.22 vs $35 per 1M).
Task by task
| Task area | DeepSeek V3.1 Terminus | GPT-5.5 | Winner |
|---|---|---|---|
| Translation & Localization |
#101
/ 110
Strong
|
#3
/ 110
Excellent
|
GPT-5.5 |
| Content & Brand |
#100
/ 124
Usable
|
#4
/ 124
Strong
|
GPT-5.5 |
| Chef / Home Cooking |
#95
/ 126
Usable
|
#4
/ 126
Strong
|
GPT-5.5 |
| Coding |
#92
/ 115
Usable
|
#1
/ 115
Excellent
|
GPT-5.5 |
| Presentations & Decks |
#91
/ 110
Strong
|
#3
/ 110
Excellent
|
GPT-5.5 |
| Creative & Comedy | #89 / 110 | #2 / 110 | GPT-5.5 |
| Legal & HR |
#95
/ 110
Strong
|
#9
/ 110
Excellent
|
GPT-5.5 |
| RAG, Safety & Grounding |
#85
/ 113
Excellent
|
#16
/ 113
Excellent
|
GPT-5.5 |
| Customer Support |
#69
/ 113
Usable
|
#3
/ 113
Strong
|
GPT-5.5 |
| Executive Assistant |
#77
/ 112
Usable
|
#11
/ 112
Strong
|
GPT-5.5 |
| Structured Output |
#63
/ 113
Excellent
|
#3
/ 113
Excellent
|
GPT-5.5 |
| Sales |
#97
/ 110
Needs editing
|
#42
/ 110
Usable
|
GPT-5.5 |
| Investor & Pitch |
#64
/ 66
Needs editing
|
#16
/ 66
Strong
|
GPT-5.5 |
| Knowledge & Docs |
#50
/ 110
Usable
|
#5
/ 110
Excellent
|
GPT-5.5 |
| AI Strategy |
#101
/ 126
Usable
|
#62
/ 126
Strong
|
GPT-5.5 |
| Research & Competitive Analysis |
#46
/ 110
Strong
|
#7
/ 110
Excellent
|
GPT-5.5 |
| Landing Pages |
#44
/ 72
Strong
|
#9
/ 72
Strong
|
GPT-5.5 |
| Training & Education |
#31
/ 110
Excellent
|
#63
/ 110
Excellent
|
DeepSeek V3.1 Terminus |
| Product & Project Management |
#36
/ 110
Strong
|
#8
/ 110
Excellent
|
GPT-5.5 |
| Summarization & Meeting Notes |
#32
/ 110
Excellent
|
#10
/ 110
Excellent
|
GPT-5.5 |
| Frontend & Landing Pages |
#33
/ 109
Needs editing
|
#13
/ 109
Needs editing
|
GPT-5.5 |
| Data & Analytics |
#56
/ 110
Excellent
|
#48
/ 110
Excellent
|
GPT-5.5 |
Rank = position among every model config we tested in that task area (lower is better). Sorted by biggest gap first.
Frequently asked
Is DeepSeek V3.1 Terminus better than GPT-5.5?
Across 22 task areas we benchmarked, GPT-5.5 ranks higher in 21 and DeepSeek V3.1 Terminus in 1.
Which is cheaper, DeepSeek V3.1 Terminus or GPT-5.5?
DeepSeek V3.1 Terminus costs 28.7× less per token ($1.22 vs $35 per 1M).
What is DeepSeek V3.1 Terminus better at?
DeepSeek V3.1 Terminus out-ranks GPT-5.5 at Training & Education.
What is GPT-5.5 better at?
GPT-5.5 out-ranks DeepSeek V3.1 Terminus at Translation & Localization, Content & Brand, Chef / Home Cooking.
More comparisons
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Prompt × model results
12 test cases · 3 evals