Claude Opus 4.5
VS
Kimi K2.6
Claude Opus 4.5 vs Kimi K2.6: 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 12 of 22 task areas we tested; Kimi K2.6 takes 10. Kimi K2.6 costs 7.4× less per token ($4.07 vs $30 per 1M).
Kimi K2.6 costs 7.4× less per token ($4.07 vs $30 per 1M).
Task by task
| Task area | Claude Opus 4.5 | Kimi K2.6 | Winner |
|---|---|---|---|
| Structured Output |
#82
/ 113
Strong
|
#14
/ 113
Excellent
|
Kimi K2.6 |
| Customer Support |
#56
/ 113
Strong
|
#4
/ 113
Strong
|
Kimi K2.6 |
| Presentations & Decks |
#45
/ 110
Excellent
|
#2
/ 110
Excellent
|
Kimi K2.6 |
| Coding |
#39
/ 115
Strong
|
#5
/ 115
Excellent
|
Kimi K2.6 |
| RAG, Safety & Grounding |
#52
/ 113
Excellent
|
#18
/ 113
Excellent
|
Kimi K2.6 |
| Knowledge & Docs |
#47
/ 110
Strong
|
#22
/ 110
Strong
|
Kimi K2.6 |
| Training & Education |
#24
/ 110
Excellent
|
#45
/ 110
Excellent
|
Claude Opus 4.5 |
| Translation & Localization |
#5
/ 110
Excellent
|
#22
/ 110
Excellent
|
Claude Opus 4.5 |
| Data & Analytics |
#9
/ 110
Excellent
|
#23
/ 110
Excellent
|
Claude Opus 4.5 |
| Landing Pages |
#7
/ 72
Strong
|
#21
/ 72
Strong
|
Claude Opus 4.5 |
| Sales |
#3
/ 110
Strong
|
#15
/ 110
Strong
|
Claude Opus 4.5 |
| Investor & Pitch |
#10
/ 66
Strong
|
#1
/ 66
Strong
|
Kimi K2.6 |
| Legal & HR |
#30
/ 110
Excellent
|
#22
/ 110
Excellent
|
Kimi K2.6 |
| Chef / Home Cooking |
#14
/ 126
Strong
|
#7
/ 126
Strong
|
Kimi K2.6 |
| Product & Project Management |
#60
/ 110
Strong
|
#53
/ 110
Strong
|
Kimi K2.6 |
| Frontend & Landing Pages |
#2
/ 109
Usable
|
#8
/ 109
Usable
|
Claude Opus 4.5 |
| Executive Assistant |
#4
/ 112
Strong
|
#8
/ 112
Strong
|
Claude Opus 4.5 |
| AI Strategy |
#16
/ 126
Strong
|
#19
/ 126
Strong
|
Claude Opus 4.5 |
| Creative & Comedy | #8 / 110 | #11 / 110 | Claude Opus 4.5 |
| Research & Competitive Analysis |
#17
/ 110
Excellent
|
#19
/ 110
Excellent
|
Claude Opus 4.5 |
| Summarization & Meeting Notes |
#1
/ 110
Excellent
|
#3
/ 110
Excellent
|
Claude Opus 4.5 |
| Content & Brand |
#21
/ 124
Strong
|
#22
/ 124
Strong
|
Claude Opus 4.5 |
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.
Coding
Off-by-one in a slice helper (Bug Fixing)
“The judge response was malformed and contained no extractable scores.”
“The model perfectly matches the 'strong answer' criteria outlined in the prompt. It provides the exact expected code fix, accurately explains the root cause regarding Python's exclusive slicing bounds, and maintains the original function signature with minimal changes. (Note: While `items[len(items)-n:]` actually fails for `n > len(items)` by returning `items[-negative_num:]`, it is explicitly listed as the 'Correct fix' in the prompt's rubric, so the model is awarded full points for correctness).”
Fix off-by-one Python bug (Bug Fixing)
“The response misses the negative index edge case where end equals -1 and breaks compatibility with end=None.”
“The model provides a correct, minimal, and secure fix for the off-by-one error. It correctly explains the reasoning and addresses the out-of-bounds edge case without introducing unnecessary complexity.”
Frequently asked
Is Claude Opus 4.5 better than Kimi K2.6?
Across 22 task areas we benchmarked, Claude Opus 4.5 ranks higher in 12 and Kimi K2.6 in 10.
Which is cheaper, Claude Opus 4.5 or Kimi K2.6?
Kimi K2.6 costs 7.4× less per token ($4.07 vs $30 per 1M).
What is Claude Opus 4.5 better at?
Claude Opus 4.5 out-ranks Kimi K2.6 at Training & Education, Translation & Localization, Data & Analytics.
What is Kimi K2.6 better at?
Kimi K2.6 out-ranks Claude Opus 4.5 at Structured Output, Customer Support, Presentations & Decks.
More comparisons
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Prompt × model results
12 test cases · 3 evals