Grok 4.5 vs Kimi K2.5
Head-to-head comparison across 2benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Verdict
Grok 4.5 leads for most workloads.
- Kimi K2.5 is ~3.3× cheaper on input tokens — the budget pick.
Based on BenchLM composite scores, July 2026.
Grok 4.5
75
Kimi K2.5
63
Verified leaderboard positions: Grok 4.5 unranked · Kimi K2.5 #26
Pick Grok 4.5 if you want the stronger benchmark profile. Kimi K2.5 only becomes the better choice if coding is the priority or you want the cheaper token bill.
Category Radar
Head-to-Head by Category
Category Breakdown
| Benchmark | Grok 4.5 | Δ | Kimi K2.5 |
|---|---|---|---|
| Agentic | 83.3 | ← 28.3 | 55.0 |
| Coding | 64.7 | → 0.8 | 65.5 |
| Reasoning | — | — | 61.0 |
| Knowledge | — | — | 57.2 |
| Math | — | — | 91.4 |
| Multilingual | — | — | 82.3 |
| Multimodal | — | — | 78.5 |
| Inst. Following | — | — | 93.9 |
Operational Comparison
Grok 4.5
Kimi K2.5
$2 / $6
$0.6 / $3
N/A
45 t/s
N/A
2.38s
500K
256K
Quick Verdict
Pick Grok 4.5 if you want the stronger benchmark profile. Kimi K2.5 only becomes the better choice if coding is the priority or you want the cheaper token bill.
Grok 4.5 is clearly ahead on the provisional aggregate, 75 to 63. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Grok 4.5's sharpest advantage is in agentic, where it averages 83.3 against 55. The single biggest benchmark swing on the page is Terminal-Bench 2.0, 83.3% to 50.8%. Kimi K2.5 does hit back in coding, so the answer changes if that is the part of the workload you care about most.
Grok 4.5 is also the more expensive model on tokens at $2.00 input / $6.00 output per 1M tokens, versus $0.60 input / $3.00 output per 1M tokens for Kimi K2.5. That is roughly 2.0x on output cost alone. Grok 4.5 is the reasoning model in the pair, while Kimi K2.5 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. Grok 4.5 gives you the larger context window at 500K, compared with 256K for Kimi K2.5.
Benchmark Deep Dive
Frequently Asked Questions (3)
Which is better, Grok 4.5 or Kimi K2.5?
Grok 4.5 is ahead on BenchLM's provisional leaderboard, 75 to 63. The biggest single separator in this matchup is Terminal-Bench 2.0, where the scores are 83.3% and 50.8%.
Which is better for coding, Grok 4.5 or Kimi K2.5?
Kimi K2.5 has the edge for coding in this comparison, averaging 65.5 versus 64.7. Inside this category, SWE-bench Pro is the benchmark that creates the most daylight between them.
Which is better for agentic tasks, Grok 4.5 or Kimi K2.5?
Grok 4.5 has the edge for agentic tasks in this comparison, averaging 83.3 versus 55. Inside this category, Terminal-Bench 2.0 is the benchmark that creates the most daylight between them.
Self-host vs API cost
Estimates at 50,000 req/day · 1000 tokens/req average.
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