Head-to-head comparison across 3benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
GPT-5.4 mini
71
Kimi K2.6
84
Verified leaderboard positions: GPT-5.4 mini unranked · Kimi K2.6 #6
Pick Kimi K2.6 if you want the stronger benchmark profile. GPT-5.4 mini only becomes the better choice if knowledge is the priority or you need the larger 400K context window.
Agentic
+7.5 difference
Knowledge
+3.6 difference
Multimodal
+3.1 difference
GPT-5.4 mini
Kimi K2.6
$0.75 / $4.5
$0.95 / $4
201 t/s
N/A
3.85s
N/A
400K
256K
Pick Kimi K2.6 if you want the stronger benchmark profile. GPT-5.4 mini only becomes the better choice if knowledge is the priority or you need the larger 400K context window.
Kimi K2.6 is clearly ahead on the provisional aggregate, 84 to 71. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Kimi K2.6's sharpest advantage is in agentic, where it averages 73.1 against 65.6. The single biggest benchmark swing on the page is HLE, 41.5% to 34.7%. GPT-5.4 mini does hit back in knowledge, so the answer changes if that is the part of the workload you care about most.
GPT-5.4 mini is also the more expensive model on tokens at $0.75 input / $4.50 output per 1M tokens, versus $0.95 input / $4.00 output per 1M tokens for Kimi K2.6. GPT-5.4 mini gives you the larger context window at 400K, compared with 256K for Kimi K2.6.
Kimi K2.6 is ahead on BenchLM's provisional leaderboard, 84 to 71. The biggest single separator in this matchup is HLE, where the scores are 41.5% and 34.7%.
GPT-5.4 mini has the edge for knowledge tasks in this comparison, averaging 57.4 versus 53.8. Inside this category, HLE is the benchmark that creates the most daylight between them.
Kimi K2.6 has the edge for agentic tasks in this comparison, averaging 73.1 versus 65.6. Inside this category, Toolathlon is the benchmark that creates the most daylight between them.
Kimi K2.6 has the edge for multimodal and grounded tasks in this comparison, averaging 79.7 versus 76.6. Inside this category, MMMU-Pro is the benchmark that creates the most daylight between them.
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