Head-to-head comparison across 3benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Grok 4.3
74
Kimi K2.5 (Reasoning)
75
Pick Kimi K2.5 (Reasoning) if you want the stronger benchmark profile. Grok 4.3 only becomes the better choice if you want the cheaper token bill or you need the larger 1M context window.
Coding
+29.5 difference
Knowledge
+33.4 difference
Multimodal
+0.4 difference
Grok 4.3
Kimi K2.5 (Reasoning)
$1.25 / $2.5
$0.6 / $3
209 t/s
N/A
12.36s
N/A
1M
128K
Pick Kimi K2.5 (Reasoning) if you want the stronger benchmark profile. Grok 4.3 only becomes the better choice if you want the cheaper token bill or you need the larger 1M context window.
Kimi K2.5 (Reasoning) finishes one point ahead on BenchLM's provisional leaderboard, 75 to 74. That is enough to call, but not enough to treat as a blowout. This matchup comes down to a few meaningful edges rather than one model dominating the board.
Kimi K2.5 (Reasoning)'s sharpest advantage is in knowledge, where it averages 87.3 against 53.9. The single biggest benchmark swing on the page is GPQA, 90.1% to 87.6%.
Kimi K2.5 (Reasoning) is also the more expensive model on tokens at $0.60 input / $3.00 output per 1M tokens, versus $1.25 input / $2.50 output per 1M tokens for Grok 4.3. Grok 4.3 gives you the larger context window at 1M, compared with 128K for Kimi K2.5 (Reasoning).
Kimi K2.5 (Reasoning) is ahead on BenchLM's provisional leaderboard, 75 to 74. The biggest single separator in this matchup is GPQA, where the scores are 90.1% and 87.6%.
Kimi K2.5 (Reasoning) has the edge for knowledge tasks in this comparison, averaging 87.3 versus 53.9. Inside this category, AA-Omniscience Hallucination Rate 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 47.3. Inside this category, Terminal-Bench Hard 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 78.1. Inside this category, Design Arena Website is the benchmark that creates the most daylight between them.
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