Claude Sonnet 5
VS
GPT-5.5
Claude Sonnet 5 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 18 of 22 task areas we tested; Claude Sonnet 5 takes 4. Claude Sonnet 5 costs 2.9× less per token ($12 vs $35 per 1M).
Claude Sonnet 5 costs 2.9× less per token ($12 vs $35 per 1M).
Task by task
| Task area | Claude Sonnet 5 | GPT-5.5 | Winner |
|---|---|---|---|
| Summarization & Meeting Notes |
#105
/ 107
Excellent
|
#8
/ 107
Excellent
|
GPT-5.5 |
| Creative & Comedy | #76 / 107 | #2 / 107 | GPT-5.5 |
| Content & Brand |
#68
/ 124
Strong
|
#2
/ 124
Strong
|
GPT-5.5 |
| RAG, Safety & Grounding |
#77
/ 110
Excellent
|
#14
/ 110
Excellent
|
GPT-5.5 |
| Structured Output |
#64
/ 110
Strong
|
#3
/ 110
Excellent
|
GPT-5.5 |
| Executive Assistant |
#69
/ 112
Strong
|
#10
/ 112
Strong
|
GPT-5.5 |
| AI Strategy |
#1
/ 126
Strong
|
#59
/ 126
Strong
|
Claude Sonnet 5 |
| Product & Project Management |
#59
/ 107
Strong
|
#8
/ 107
Excellent
|
GPT-5.5 |
| Customer Support |
#52
/ 113
Strong
|
#2
/ 113
Strong
|
GPT-5.5 |
| Legal & HR |
#55
/ 107
Excellent
|
#9
/ 107
Excellent
|
GPT-5.5 |
| Frontend & Landing Pages |
#54
/ 106
Needs editing
|
#10
/ 106
Needs editing
|
GPT-5.5 |
| Translation & Localization |
#40
/ 107
Excellent
|
#3
/ 107
Excellent
|
GPT-5.5 |
| Data & Analytics |
#15
/ 110
Excellent
|
#46
/ 110
Excellent
|
Claude Sonnet 5 |
| Sales |
#15
/ 107
Strong
|
#40
/ 107
Usable
|
Claude Sonnet 5 |
| Chef / Home Cooking |
#27
/ 126
Usable
|
#4
/ 126
Strong
|
GPT-5.5 |
| Investor & Pitch |
#34
/ 63
Usable
|
#12
/ 63
Strong
|
GPT-5.5 |
| Landing Pages |
#23
/ 69
Strong
|
#4
/ 69
Strong
|
GPT-5.5 |
| Presentations & Decks |
#20
/ 107
Excellent
|
#2
/ 107
Excellent
|
GPT-5.5 |
| Knowledge & Docs |
#18
/ 107
Strong
|
#5
/ 107
Excellent
|
GPT-5.5 |
| Training & Education |
#49
/ 107
Excellent
|
#59
/ 107
Excellent
|
Claude Sonnet 5 |
| Research & Competitive Analysis |
#15
/ 107
Excellent
|
#7
/ 107
Excellent
|
GPT-5.5 |
| Coding |
#6
/ 115
Excellent
|
#1
/ 115
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 Claude Sonnet 5 better than GPT-5.5?
Across 22 task areas we benchmarked, GPT-5.5 ranks higher in 18 and Claude Sonnet 5 in 4.
Which is cheaper, Claude Sonnet 5 or GPT-5.5?
Claude Sonnet 5 costs 2.9× less per token ($12 vs $35 per 1M).
What is Claude Sonnet 5 better at?
Claude Sonnet 5 out-ranks GPT-5.5 at AI Strategy, Data & Analytics, Sales.
What is GPT-5.5 better at?
GPT-5.5 out-ranks Claude Sonnet 5 at Summarization & Meeting Notes, Creative & Comedy, Content & Brand.
This page is Spring Prompt, running
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Prompt × model results
12 test cases · 3 evals