Claude Opus 4.8
VS
Gemini 3.5 Flash
Claude Opus 4.8 vs Gemini 3.5 Flash: 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 4.8 wins 17 of 22 task areas we tested; Gemini 3.5 Flash takes 5. Gemini 3.5 Flash costs 2.9× less per token ($10.5 vs $30 per 1M).
Gemini 3.5 Flash costs 2.9× less per token ($10.5 vs $30 per 1M).
Task by task
| Task area | Claude Opus 4.8 | Gemini 3.5 Flash | Winner |
|---|---|---|---|
| Legal & HR |
#5
/ 110
Excellent
|
#73
/ 110
Strong
|
Claude Opus 4.8 |
| Research & Competitive Analysis |
#5
/ 110
Excellent
|
#65
/ 110
Usable
|
Claude Opus 4.8 |
| Knowledge & Docs |
#2
/ 110
Excellent
|
#44
/ 110
Strong
|
Claude Opus 4.8 |
| Content & Brand |
#8
/ 124
Strong
|
#46
/ 124
Strong
|
Claude Opus 4.8 |
| Data & Analytics |
#2
/ 110
Excellent
|
#34
/ 110
Excellent
|
Claude Opus 4.8 |
| Sales |
#1
/ 110
Strong
|
#33
/ 110
Strong
|
Claude Opus 4.8 |
| Product & Project Management |
#2
/ 110
Excellent
|
#33
/ 110
Strong
|
Claude Opus 4.8 |
| Investor & Pitch |
#27
/ 66
Strong
|
#56
/ 66
Usable
|
Claude Opus 4.8 |
| Structured Output |
#61
/ 113
Excellent
|
#35
/ 113
Excellent
|
Gemini 3.5 Flash |
| Coding |
#3
/ 115
Excellent
|
#28
/ 115
Strong
|
Claude Opus 4.8 |
| Landing Pages |
#18
/ 72
Strong
|
#40
/ 72
Strong
|
Claude Opus 4.8 |
| AI Strategy |
#4
/ 126
Strong
|
#23
/ 126
Strong
|
Claude Opus 4.8 |
| Summarization & Meeting Notes |
#35
/ 110
Excellent
|
#17
/ 110
Excellent
|
Gemini 3.5 Flash |
| Frontend & Landing Pages |
#21
/ 109
Needs editing
|
#4
/ 109
Usable
|
Gemini 3.5 Flash |
| Chef / Home Cooking |
#9
/ 126
Strong
|
#24
/ 126
Usable
|
Claude Opus 4.8 |
| Presentations & Decks |
#32
/ 110
Excellent
|
#17
/ 110
Excellent
|
Gemini 3.5 Flash |
| Creative & Comedy | #17 / 110 | #27 / 110 | Claude Opus 4.8 |
| Executive Assistant |
#9
/ 112
Strong
|
#19
/ 112
Strong
|
Claude Opus 4.8 |
| Training & Education |
#2
/ 110
Excellent
|
#7
/ 110
Excellent
|
Claude Opus 4.8 |
| Translation & Localization |
#35
/ 110
Excellent
|
#30
/ 110
Excellent
|
Gemini 3.5 Flash |
| Customer Support |
#8
/ 113
Strong
|
#12
/ 113
Strong
|
Claude Opus 4.8 |
| RAG, Safety & Grounding |
#11
/ 113
Excellent
|
#15
/ 113
Excellent
|
Claude Opus 4.8 |
Rank = position among every model config we tested in that task area (lower is better). Sorted by biggest gap first.
Frequently asked
Is Claude Opus 4.8 better than Gemini 3.5 Flash?
Across 22 task areas we benchmarked, Claude Opus 4.8 ranks higher in 17 and Gemini 3.5 Flash in 5.
Which is cheaper, Claude Opus 4.8 or Gemini 3.5 Flash?
Gemini 3.5 Flash costs 2.9× less per token ($10.5 vs $30 per 1M).
What is Claude Opus 4.8 better at?
Claude Opus 4.8 out-ranks Gemini 3.5 Flash at Legal & HR, Research & Competitive Analysis, Knowledge & Docs.
What is Gemini 3.5 Flash better at?
Gemini 3.5 Flash out-ranks Claude Opus 4.8 at Structured Output, Summarization & Meeting Notes, Frontend & Landing Pages.
More comparisons
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