Claude Sonnet 4.5
VS
Gemini 3.1 Flash Lite
Claude Sonnet 4.5 vs Gemini 3.1 Flash Lite: 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.
Claude Sonnet 4.5 wins 14 of 22 task areas we tested; Gemini 3.1 Flash Lite takes 8. Gemini 3.1 Flash Lite costs 10.3× less per token ($1.75 vs $18 per 1M).
Gemini 3.1 Flash Lite costs 10.3× less per token ($1.75 vs $18 per 1M).
Task by task
| Task area | Claude Sonnet 4.5 | Gemini 3.1 Flash Lite | Winner |
|---|---|---|---|
| Executive Assistant |
#31
/ 112
Strong
|
#101
/ 112
Usable
|
Claude Sonnet 4.5 |
| Sales |
#10
/ 110
Strong
|
#67
/ 110
Usable
|
Claude Sonnet 4.5 |
| Structured Output |
#80
/ 113
Strong
|
#36
/ 113
Excellent
|
Gemini 3.1 Flash Lite |
| Product & Project Management |
#71
/ 110
Strong
|
#29
/ 110
Excellent
|
Gemini 3.1 Flash Lite |
| Presentations & Decks |
#43
/ 110
Excellent
|
#80
/ 110
Strong
|
Claude Sonnet 4.5 |
| Content & Brand |
#74
/ 124
Usable
|
#43
/ 124
Strong
|
Gemini 3.1 Flash Lite |
| Creative & Comedy | #66 / 110 | #85 / 110 | Claude Sonnet 4.5 |
| Frontend & Landing Pages |
#29
/ 109
Needs editing
|
#10
/ 109
Usable
|
Gemini 3.1 Flash Lite |
| RAG, Safety & Grounding |
#39
/ 113
Excellent
|
#58
/ 113
Excellent
|
Claude Sonnet 4.5 |
| Training & Education |
#51
/ 110
Excellent
|
#33
/ 110
Excellent
|
Gemini 3.1 Flash Lite |
| Legal & HR |
#69
/ 110
Strong
|
#86
/ 110
Strong
|
Claude Sonnet 4.5 |
| Research & Competitive Analysis |
#39
/ 110
Strong
|
#56
/ 110
Usable
|
Claude Sonnet 4.5 |
| Translation & Localization |
#25
/ 110
Excellent
|
#39
/ 110
Excellent
|
Claude Sonnet 4.5 |
| AI Strategy |
#67
/ 126
Strong
|
#54
/ 126
Strong
|
Gemini 3.1 Flash Lite |
| Landing Pages |
#30
/ 72
Strong
|
#43
/ 72
Strong
|
Claude Sonnet 4.5 |
| Customer Support |
#43
/ 113
Strong
|
#54
/ 113
Strong
|
Claude Sonnet 4.5 |
| Data & Analytics |
#33
/ 110
Excellent
|
#44
/ 110
Excellent
|
Claude Sonnet 4.5 |
| Summarization & Meeting Notes |
#2
/ 110
Excellent
|
#13
/ 110
Excellent
|
Claude Sonnet 4.5 |
| Chef / Home Cooking |
#80
/ 126
Usable
|
#70
/ 126
Usable
|
Gemini 3.1 Flash Lite |
| Knowledge & Docs |
#28
/ 110
Strong
|
#33
/ 110
Strong
|
Claude Sonnet 4.5 |
| Coding |
#62
/ 115
Strong
|
#58
/ 115
Strong
|
Gemini 3.1 Flash Lite |
| Investor & Pitch |
#42
/ 66
Usable
|
#44
/ 66
Usable
|
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 Gemini 3.1 Flash Lite?
Across 22 task areas we benchmarked, Claude Sonnet 4.5 ranks higher in 14 and Gemini 3.1 Flash Lite in 8.
Which is cheaper, Claude Sonnet 4.5 or Gemini 3.1 Flash Lite?
Gemini 3.1 Flash Lite costs 10.3× less per token ($1.75 vs $18 per 1M).
What is Claude Sonnet 4.5 better at?
Claude Sonnet 4.5 out-ranks Gemini 3.1 Flash Lite at Executive Assistant, Sales, Presentations & Decks.
What is Gemini 3.1 Flash Lite better at?
Gemini 3.1 Flash Lite out-ranks Claude Sonnet 4.5 at Structured Output, Product & Project Management, Content & Brand.
More comparisons
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