Grok 4.5 vs Kimi K2.5 (Reasoning)
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 (Reasoning) is ~3.3× cheaper on input tokens — the budget pick.
Based on BenchLM composite scores, July 2026.
Grok 4.5
75
Kimi K2.5 (Reasoning)
72
Pick Grok 4.5 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 cheaper token bill.
Category Radar
Head-to-Head by Category
Category Breakdown
| Benchmark | Grok 4.5 | Δ | Kimi K2.5 (Reasoning) |
|---|---|---|---|
| Agentic | 83.3 | ← 28.3 | 55.0 |
| Coding | 64.7 | → 12.1 | 76.8 |
| Knowledge | — | — | 87.2 |
| Multimodal | — | — | 78.5 |
Operational Comparison
Grok 4.5
Kimi K2.5 (Reasoning)
$2 / $6
$0.6 / $3
N/A
N/A
N/A
N/A
500K
128K
Quick Verdict
Pick Grok 4.5 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 cheaper token bill.
Grok 4.5 has the cleaner provisional overall profile here, landing at 75 versus 72. It is a real lead, but still close enough that category-level strengths matter more than the headline number.
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 (Reasoning) 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 (Reasoning). That is roughly 2.0x on output cost alone. Grok 4.5 gives you the larger context window at 500K, compared with 128K for Kimi K2.5 (Reasoning).
Benchmark Deep Dive
Frequently Asked Questions (3)
Which is better, Grok 4.5 or Kimi K2.5 (Reasoning)?
Grok 4.5 is ahead on BenchLM's provisional leaderboard, 75 to 72. 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 (Reasoning)?
Kimi K2.5 (Reasoning) has the edge for coding in this comparison, averaging 76.8 versus 64.7. Grok 4.5 stays close enough that the answer can still flip depending on your workload.
Which is better for agentic tasks, Grok 4.5 or Kimi K2.5 (Reasoning)?
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.
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