Claude Opus 4.5
VS
Gemini 3.1 Flash Lite
Claude Opus 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 Opus 4.5 wins 18 of 22 task areas we tested; Gemini 3.1 Flash Lite takes 4. Gemini 3.1 Flash Lite costs 17.1× less per token ($1.75 vs $30 per 1M).
Gemini 3.1 Flash Lite costs 17.1× less per token ($1.75 vs $30 per 1M).
Task by task
| Task area | Claude Opus 4.5 | Gemini 3.1 Flash Lite | Winner |
|---|---|---|---|
| Executive Assistant |
#4
/ 112
Strong
|
#101
/ 112
Usable
|
Claude Opus 4.5 |
| Creative & Comedy | #8 / 110 | #85 / 110 | Claude Opus 4.5 |
| Sales |
#3
/ 110
Strong
|
#67
/ 110
Usable
|
Claude Opus 4.5 |
| Chef / Home Cooking |
#14
/ 126
Strong
|
#70
/ 126
Usable
|
Claude Opus 4.5 |
| Legal & HR |
#30
/ 110
Excellent
|
#86
/ 110
Strong
|
Claude Opus 4.5 |
| Structured Output |
#82
/ 113
Strong
|
#36
/ 113
Excellent
|
Gemini 3.1 Flash Lite |
| Research & Competitive Analysis |
#17
/ 110
Excellent
|
#56
/ 110
Usable
|
Claude Opus 4.5 |
| AI Strategy |
#16
/ 126
Strong
|
#54
/ 126
Strong
|
Claude Opus 4.5 |
| Landing Pages |
#7
/ 72
Strong
|
#43
/ 72
Strong
|
Claude Opus 4.5 |
| Data & Analytics |
#9
/ 110
Excellent
|
#44
/ 110
Excellent
|
Claude Opus 4.5 |
| Presentations & Decks |
#45
/ 110
Excellent
|
#80
/ 110
Strong
|
Claude Opus 4.5 |
| Investor & Pitch |
#10
/ 66
Strong
|
#44
/ 66
Usable
|
Claude Opus 4.5 |
| Translation & Localization |
#5
/ 110
Excellent
|
#39
/ 110
Excellent
|
Claude Opus 4.5 |
| Product & Project Management |
#60
/ 110
Strong
|
#29
/ 110
Excellent
|
Gemini 3.1 Flash Lite |
| Content & Brand |
#21
/ 124
Strong
|
#43
/ 124
Strong
|
Claude Opus 4.5 |
| Coding |
#39
/ 115
Strong
|
#58
/ 115
Strong
|
Claude Opus 4.5 |
| Knowledge & Docs |
#47
/ 110
Strong
|
#33
/ 110
Strong
|
Gemini 3.1 Flash Lite |
| Summarization & Meeting Notes |
#1
/ 110
Excellent
|
#13
/ 110
Excellent
|
Claude Opus 4.5 |
| Training & Education |
#24
/ 110
Excellent
|
#33
/ 110
Excellent
|
Claude Opus 4.5 |
| Frontend & Landing Pages |
#2
/ 109
Usable
|
#10
/ 109
Usable
|
Claude Opus 4.5 |
| RAG, Safety & Grounding |
#52
/ 113
Excellent
|
#58
/ 113
Excellent
|
Claude Opus 4.5 |
| Customer Support |
#56
/ 113
Strong
|
#54
/ 113
Strong
|
Gemini 3.1 Flash Lite |
Rank = position among every model config we tested in that task area (lower is better). Sorted by biggest gap first.
Same task, both models — judged
Both models answered the same test case; an independent judge graded each. Quotes are the judge's actual rationale.
Executive Assistant
Overpromising sales reply (Message Risk Review)
“The response is expert-level and production-ready. It perfectly balances maintaining commercial momentum with mitigating delivery risk, follows all constraints, and presents the information in a highly digestible format.”
“The model provides excellent risk detection and solid rewrites. However, it fails a hard constraint in the Strategy section by advising the user to promise a two-week delivery for the 'core system' without scoping, which directly contradicts the instruction 'Do not promise unverified delivery' and undermines the entire premise.”
Frequently asked
Is Claude Opus 4.5 better than Gemini 3.1 Flash Lite?
Across 22 task areas we benchmarked, Claude Opus 4.5 ranks higher in 18 and Gemini 3.1 Flash Lite in 4.
Which is cheaper, Claude Opus 4.5 or Gemini 3.1 Flash Lite?
Gemini 3.1 Flash Lite costs 17.1× less per token ($1.75 vs $30 per 1M).
What is Claude Opus 4.5 better at?
Claude Opus 4.5 out-ranks Gemini 3.1 Flash Lite at Executive Assistant, Creative & Comedy, Sales.
What is Gemini 3.1 Flash Lite better at?
Gemini 3.1 Flash Lite out-ranks Claude Opus 4.5 at Structured Output, Product & Project Management, Knowledge & Docs.
More comparisons
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Prompt × model results
12 test cases · 3 evals