Claude Opus 4.8
VS
Kimi K2.5
Claude Opus 4.8 vs Kimi K2.5: 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; Kimi K2.5 takes 3. Kimi K2.5 costs 12.5× less per token ($2.4 vs $30 per 1M).
Kimi K2.5 costs 12.5× less per token ($2.4 vs $30 per 1M).
Task by task
| Task area | Claude Opus 4.8 | Kimi K2.5 | Winner |
|---|---|---|---|
| Product & Project Management |
#2
/ 110
Excellent
|
#66
/ 110
Strong
|
Claude Opus 4.8 |
| Knowledge & Docs |
#2
/ 110
Excellent
|
#59
/ 110
Usable
|
Claude Opus 4.8 |
| Summarization & Meeting Notes |
#35
/ 110
Excellent
|
#92
/ 110
Excellent
|
Claude Opus 4.8 |
| Customer Support |
#8
/ 113
Strong
|
#50
/ 113
Strong
|
Claude Opus 4.8 |
| Chef / Home Cooking |
#9
/ 126
Strong
|
#44
/ 126
Usable
|
Claude Opus 4.8 |
| Coding |
#3
/ 115
Excellent
|
#38
/ 115
Strong
|
Claude Opus 4.8 |
| Legal & HR |
#5
/ 110
Excellent
|
#31
/ 110
Excellent
|
Claude Opus 4.8 |
| Research & Competitive Analysis |
#5
/ 110
Excellent
|
#31
/ 110
Strong
|
Claude Opus 4.8 |
| Content & Brand |
#8
/ 124
Strong
|
#33
/ 124
Strong
|
Claude Opus 4.8 |
| Creative & Comedy | #17 / 110 | #42 / 110 | Claude Opus 4.8 |
| AI Strategy |
#4
/ 126
Strong
|
#28
/ 126
Strong
|
Claude Opus 4.8 |
| Presentations & Decks |
#32
/ 110
Excellent
|
#12
/ 110
Excellent
|
Kimi K2.5 |
| Structured Output |
#61
/ 113
Excellent
|
#41
/ 113
Excellent
|
Kimi K2.5 |
| Training & Education |
#2
/ 110
Excellent
|
#22
/ 110
Excellent
|
Claude Opus 4.8 |
| Sales |
#1
/ 110
Strong
|
#19
/ 110
Strong
|
Claude Opus 4.8 |
| Data & Analytics |
#2
/ 110
Excellent
|
#19
/ 110
Excellent
|
Claude Opus 4.8 |
| Executive Assistant |
#9
/ 112
Strong
|
#23
/ 112
Strong
|
Claude Opus 4.8 |
| Investor & Pitch |
#27
/ 66
Strong
|
#37
/ 66
Usable
|
Claude Opus 4.8 |
| Frontend & Landing Pages |
#21
/ 109
Needs editing
|
#26
/ 109
Needs editing
|
Claude Opus 4.8 |
| Landing Pages |
#18
/ 72
Strong
|
#20
/ 72
Strong
|
Claude Opus 4.8 |
| RAG, Safety & Grounding |
#11
/ 113
Excellent
|
#12
/ 113
Excellent
|
Claude Opus 4.8 |
| Translation & Localization |
#35
/ 110
Excellent
|
#34
/ 110
Excellent
|
Kimi K2.5 |
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 Kimi K2.5?
Across 22 task areas we benchmarked, Claude Opus 4.8 ranks higher in 19 and Kimi K2.5 in 3.
Which is cheaper, Claude Opus 4.8 or Kimi K2.5?
Kimi K2.5 costs 12.5× less per token ($2.4 vs $30 per 1M).
What is Claude Opus 4.8 better at?
Claude Opus 4.8 out-ranks Kimi K2.5 at Product & Project Management, Knowledge & Docs, Summarization & Meeting Notes.
What is Kimi K2.5 better at?
Kimi K2.5 out-ranks Claude Opus 4.8 at Presentations & Decks, Structured Output, Translation & Localization.
More comparisons
This page is Spring Prompt, running in public
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