Claude Opus 4.8
VS
Claude Sonnet 5
Claude Opus 4.8 vs Claude Sonnet 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.
Claude Opus 4.8 wins 19 of 22 task areas we tested; Claude Sonnet 5 takes 3. Claude Sonnet 5 costs 2.5× less per token ($12 vs $30 per 1M).
Claude Sonnet 5 costs 2.5× less per token ($12 vs $30 per 1M).
Task by task
| Task area | Claude Opus 4.8 | Claude Sonnet 5 | Winner |
|---|---|---|---|
| Summarization & Meeting Notes |
#32
/ 107
Excellent
|
#105
/ 107
Excellent
|
Claude Opus 4.8 |
| RAG, Safety & Grounding |
#11
/ 110
Excellent
|
#77
/ 110
Excellent
|
Claude Opus 4.8 |
| Creative & Comedy | #11 / 107 | #76 / 107 | Claude Opus 4.8 |
| Executive Assistant |
#7
/ 109
Strong
|
#66
/ 109
Strong
|
Claude Opus 4.8 |
| Product & Project Management |
#2
/ 107
Excellent
|
#59
/ 107
Strong
|
Claude Opus 4.8 |
| Content & Brand |
#15
/ 124
Strong
|
#68
/ 124
Strong
|
Claude Opus 4.8 |
| Legal & HR |
#5
/ 107
Excellent
|
#55
/ 107
Excellent
|
Claude Opus 4.8 |
| Training & Education |
#2
/ 107
Excellent
|
#49
/ 107
Excellent
|
Claude Opus 4.8 |
| Customer Support |
#7
/ 113
Strong
|
#52
/ 113
Strong
|
Claude Opus 4.8 |
| Frontend & Landing Pages |
#18
/ 106
Needs editing
|
#54
/ 106
Needs editing
|
Claude Opus 4.8 |
| Chef / Home Cooking |
#8
/ 126
Strong
|
#27
/ 126
Usable
|
Claude Opus 4.8 |
| Knowledge & Docs |
#2
/ 107
Excellent
|
#18
/ 107
Strong
|
Claude Opus 4.8 |
| Sales |
#1
/ 107
Strong
|
#15
/ 107
Strong
|
Claude Opus 4.8 |
| Data & Analytics |
#2
/ 110
Excellent
|
#15
/ 110
Excellent
|
Claude Opus 4.8 |
| Investor & Pitch |
#22
/ 63
Strong
|
#34
/ 63
Usable
|
Claude Opus 4.8 |
| Presentations & Decks |
#30
/ 107
Excellent
|
#20
/ 107
Excellent
|
Claude Sonnet 5 |
| Research & Competitive Analysis |
#5
/ 107
Excellent
|
#15
/ 107
Excellent
|
Claude Opus 4.8 |
| Structured Output |
#56
/ 110
Excellent
|
#64
/ 110
Strong
|
Claude Opus 4.8 |
| Translation & Localization |
#34
/ 107
Excellent
|
#40
/ 107
Excellent
|
Claude Opus 4.8 |
| Landing Pages |
#28
/ 69
Strong
|
#23
/ 69
Strong
|
Claude Sonnet 5 |
| Coding |
#3
/ 115
Excellent
|
#6
/ 115
Excellent
|
Claude Opus 4.8 |
| AI Strategy |
#3
/ 126
Strong
|
#1
/ 126
Strong
|
Claude Sonnet 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 Opus 4.8 better than Claude Sonnet 5?
Across 22 task areas we benchmarked, Claude Opus 4.8 ranks higher in 19 and Claude Sonnet 5 in 3.
Which is cheaper, Claude Opus 4.8 or Claude Sonnet 5?
Claude Sonnet 5 costs 2.5× less per token ($12 vs $30 per 1M).
What is Claude Opus 4.8 better at?
Claude Opus 4.8 out-ranks Claude Sonnet 5 at Summarization & Meeting Notes, RAG, Safety & Grounding, Creative & Comedy.
What is Claude Sonnet 5 better at?
Claude Sonnet 5 out-ranks Claude Opus 4.8 at Presentations & Decks, Landing Pages, AI Strategy.
This page is Spring Prompt, running
We just did this for every model. Do it for your prompt.
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.
- Generate test cases from your prompt — no eval set required to start.
- 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