Gemini 3.1 Pro Preview
VS
GPT-5.5
Gemini 3.1 Pro Preview 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 13 of 22 task areas we tested; Gemini 3.1 Pro Preview takes 9. Gemini 3.1 Pro Preview costs 2.5× less per token ($14 vs $35 per 1M).
Gemini 3.1 Pro Preview costs 2.5× less per token ($14 vs $35 per 1M).
Task by task
| Task area | Gemini 3.1 Pro Preview | GPT-5.5 | Winner |
|---|---|---|---|
| Training & Education |
#4
/ 107
Excellent
|
#59
/ 107
Excellent
|
Gemini 3.1 Pro Preview |
| Coding |
#55
/ 115
Strong
|
#1
/ 115
Excellent
|
GPT-5.5 |
| Research & Competitive Analysis |
#40
/ 107
Strong
|
#7
/ 107
Excellent
|
GPT-5.5 |
| AI Strategy |
#30
/ 126
Strong
|
#59
/ 126
Strong
|
Gemini 3.1 Pro Preview |
| Frontend & Landing Pages |
#31
/ 106
Needs editing
|
#10
/ 106
Needs editing
|
GPT-5.5 |
| Presentations & Decks |
#22
/ 107
Excellent
|
#2
/ 107
Excellent
|
GPT-5.5 |
| Product & Project Management |
#25
/ 107
Excellent
|
#8
/ 107
Excellent
|
GPT-5.5 |
| Knowledge & Docs |
#19
/ 107
Strong
|
#5
/ 107
Excellent
|
GPT-5.5 |
| Structured Output |
#14
/ 110
Excellent
|
#3
/ 110
Excellent
|
GPT-5.5 |
| Translation & Localization |
#14
/ 107
Excellent
|
#3
/ 107
Excellent
|
GPT-5.5 |
| Data & Analytics |
#37
/ 110
Excellent
|
#46
/ 110
Excellent
|
Gemini 3.1 Pro Preview |
| Sales |
#31
/ 107
Strong
|
#40
/ 107
Usable
|
Gemini 3.1 Pro Preview |
| Legal & HR |
#17
/ 107
Excellent
|
#9
/ 107
Excellent
|
GPT-5.5 |
| RAG, Safety & Grounding |
#8
/ 110
Excellent
|
#14
/ 110
Excellent
|
Gemini 3.1 Pro Preview |
| Summarization & Meeting Notes |
#3
/ 107
Excellent
|
#8
/ 107
Excellent
|
Gemini 3.1 Pro Preview |
| Content & Brand |
#5
/ 124
Strong
|
#2
/ 124
Strong
|
GPT-5.5 |
| Executive Assistant |
#13
/ 112
Strong
|
#10
/ 112
Strong
|
GPT-5.5 |
| Chef / Home Cooking |
#6
/ 126
Strong
|
#4
/ 126
Strong
|
GPT-5.5 |
| Creative & Comedy | #4 / 107 | #2 / 107 | GPT-5.5 |
| Investor & Pitch |
#10
/ 63
Strong
|
#12
/ 63
Strong
|
Gemini 3.1 Pro Preview |
| Landing Pages |
#2
/ 69
Strong
|
#4
/ 69
Strong
|
Gemini 3.1 Pro Preview |
| Customer Support |
#1
/ 113
Strong
|
#2
/ 113
Strong
|
Gemini 3.1 Pro Preview |
Rank = position among every model config we tested in that task area (lower is better). Sorted by biggest gap first.
Frequently asked
Is Gemini 3.1 Pro Preview better than GPT-5.5?
Across 22 task areas we benchmarked, GPT-5.5 ranks higher in 13 and Gemini 3.1 Pro Preview in 9.
Which is cheaper, Gemini 3.1 Pro Preview or GPT-5.5?
Gemini 3.1 Pro Preview costs 2.5× less per token ($14 vs $35 per 1M).
What is Gemini 3.1 Pro Preview better at?
Gemini 3.1 Pro Preview out-ranks GPT-5.5 at Training & Education, AI Strategy, Data & Analytics.
What is GPT-5.5 better at?
GPT-5.5 out-ranks Gemini 3.1 Pro Preview at Coding, Research & Competitive Analysis, Frontend & Landing Pages.
This page is Spring Prompt, running
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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