Model comparison
Grok 4 vs Kimi K2
Head-to-head evidence from 13 shared benchmark results across 6 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: Grok 4 #50 (Supported); Kimi K2 #189 (Supported). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. Grok 4 and Kimi K2 share 13 comparable benchmark results. 1 of 8 categories are comparable. 3 results are unique to Grok 4; 1 to Kimi K2.
Updated July 22, 2026- Shared results
- 13
- Grok 4 only
- 3
- Kimi K2 only
- 1
- Comparable categories
- 1 / 8
Pick Grok 4 if you want the stronger benchmark profile. Kimi K2 only becomes the better choice if mathematics is the priority.
Confidence note. This is a partial-evidence comparison with 13 shared benchmark results across 6 evidence categories; 1 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.
Why this result
Grok 4 is clearly ahead on the BenchAlign aggregate, 60.42 to 27.19. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Category breakdown
Exact category averages are shown below. Not measured means BenchLM does not have enough sourced public coverage for that model and category.
| Category | Grok 4 | Δ | Kimi K2 |
|---|---|---|---|
| Math | Grok 415.3 | Margin→ 0.8 | Kimi K216.1 |
Decisive benchmark drivers
The largest measured benchmark gaps in this matchup, with exact reported values.
More
- Source ↗
FrontierMath v2 (Tier 4)
MathA 2.083%B 0.000%Winner: Grok 4Δ 2.1FrontierMath v2 (Tier 4): Grok 4 scored 2.083%; Kimi K2 scored 0.000%. Grok 4 wins this benchmark. - Source ↗
FrontierMath v2 (Tiers 1-3)
MathA 19.655%B 21.404%Winner: Kimi K2Δ 1.7FrontierMath v2 (Tiers 1-3): Grok 4 scored 19.655%; Kimi K2 scored 21.404%. Kimi K2 wins this benchmark.
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | Grok 4 | Kimi K2 | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | Grok 4Not available | Kimi K2$0.6 input / $2.5 output | A complete price comparison is not available. |
| Generation speedtokens per second | Grok 454 tok/s | Kimi K243 tok/s | Grok 4 has the higher measured throughput. |
| First-answer latencyseconds to first token | Grok 415.60 s | Kimi K21.51 s | Kimi K2 reaches the first token sooner. |
| Context windowmaximum listed tokens | Grok 4128K | Kimi K2128K | Listed context windows are equal. |
Benchmark Deep Dive
Agentic2 benchmarks
Coding2 benchmarks
Reasoning2 benchmarks
Knowledge6 benchmarks
| Benchmark | Grok 4 | Kimi K2 | Result |
|---|---|---|---|
| Artificial Analysis Intelligence IndexSource | 33.3% | 19.4% | Grok 4 leads |
| AA-GPQA DiamondSource | 87.7% | 76.6% | Grok 4 leads |
| AA-HLESource | 23.9% | 7.0% | Grok 4 leads |
| AA-Omniscience IndexSource | 3.8% | -27.5% | Grok 4 leads |
| AA-Omniscience AccuracySource | 41.4% | 26.8% | Grok 4 leads |
| AA-Omniscience Hallucination RateSource | 64.2% | 74.2% | Grok 4 leads |
MathKimi K2 wins2 benchmarks
Multimodal2 benchmarks
Inst. Following1 benchmarks
| Benchmark | Grok 4 | Kimi K2 | Result |
|---|---|---|---|
| AA-IFBenchSource | 53.7% | 41.5% | Grok 4 leads |
Frequently Asked Questions (2)
Which is better, Grok 4 or Kimi K2?
Grok 4 is ahead on BenchLM's BenchAlign leaderboard, 60.42 to 27.19. The biggest single separator in this matchup is FrontierMath v2 (Tier 4), where the scores are 2.083% and 0.000%.
Which is better for math, Grok 4 or Kimi K2?
Kimi K2 has the edge for math in this comparison, averaging 16.1 versus 15.3. Inside this category, FrontierMath v2 (Tier 4) is the benchmark that creates the most daylight between them.
Related Comparisons
Explore More
Choose a model with this week’s evidence
Join 2,000+ readers for ranking moves, pricing changes, and the claims that still need proof.
One email each week. Unsubscribe anytime.