Head-to-head comparison across 4benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Claude Opus 4.6
91
Kimi K2.5 (Reasoning)
79
Verified leaderboard positions: Claude Opus 4.6 #3 · Kimi K2.5 (Reasoning) unranked
Pick Claude Opus 4.6 if you want the stronger benchmark profile. Kimi K2.5 (Reasoning) only becomes the better choice if coding is the priority or you want the stronger reasoning-first profile.
Agentic
+18.0 difference
Coding
+12.4 difference
Knowledge
+11.1 difference
Multimodal
+1.2 difference
Claude Opus 4.6
Kimi K2.5 (Reasoning)
$5 / $25
$null / $null
40 t/s
N/A
1.78s
N/A
1M
128K
Pick Claude Opus 4.6 if you want the stronger benchmark profile. Kimi K2.5 (Reasoning) only becomes the better choice if coding is the priority or you want the stronger reasoning-first profile.
Claude Opus 4.6 is clearly ahead on the provisional aggregate, 91 to 79. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Claude Opus 4.6's sharpest advantage is in agentic, where it averages 72.6 against 54.6. The single biggest benchmark swing on the page is BrowseComp, 83.7% to 60.6%. Kimi K2.5 (Reasoning) does hit back in coding, so the answer changes if that is the part of the workload you care about most.
Kimi K2.5 (Reasoning) is the reasoning model in the pair, while Claude Opus 4.6 is not. That usually helps on harder chain-of-thought-heavy tests, but it can also mean more latency and more token spend in real use. Claude Opus 4.6 gives you the larger context window at 1M, compared with 128K for Kimi K2.5 (Reasoning).
Claude Opus 4.6 is ahead on BenchLM's provisional leaderboard, 91 to 79. The biggest single separator in this matchup is BrowseComp, where the scores are 83.7% and 60.6%.
Kimi K2.5 (Reasoning) has the edge for knowledge tasks in this comparison, averaging 87.3 versus 76.2. Inside this category, MMLU-Pro is the benchmark that creates the most daylight between them.
Kimi K2.5 (Reasoning) has the edge for coding in this comparison, averaging 76.8 versus 64.4. Inside this category, SWE-bench Verified is the benchmark that creates the most daylight between them.
Claude Opus 4.6 has the edge for agentic tasks in this comparison, averaging 72.6 versus 54.6. Inside this category, BrowseComp is the benchmark that creates the most daylight between them.
Kimi K2.5 (Reasoning) has the edge for multimodal and grounded tasks in this comparison, averaging 78.5 versus 77.3. Inside this category, MMMU-Pro is the benchmark that creates the most daylight between them.
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