Model comparison
Grok-2 (Dec 2024) vs Kimi K2 (Jul 2025)
Kimi K2 (Jul 2025) is the stronger model overall, scoring 41.2 to 33.7 on the Noometry Index.
Last verified . 23 shared benchmarks.
Summary
- They share 23 benchmarks with published results for both. Grok-2 (Dec 2024) scores higher in 0 categories and Kimi K2 (Jul 2025) in 8 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in math, where Kimi K2 (Jul 2025) leads 42.7 to 20.8.
- The biggest single-benchmark swing is Short-Story Creative Writing: 63.6% for Grok-2 (Dec 2024) and 85.6% for Kimi K2 (Jul 2025).
- Kimi K2 (Jul 2025) has downloadable open weights; the other is API-only.
Side by side
| Grok-2 (Dec 2024) | Kimi K2 (Jul 2025) | |
|---|---|---|
| Provider | xAI | Moonshot AI |
| Noometry Index | 33.7 | 41.2 |
| Released | 2024-08-13 | 2025-07-12 |
| Weights | Proprietary | Open |
| Context window | — | 262K |
| Max output | — | 262K |
| Input $ / M tokens | — | $0.57 |
| Output $ / M tokens | — | $2.30 |
| Results tracked | 34 | 42 |
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Category by category
Coding Kimi K2 (Jul 2025) leads
Grok-2 (Dec 2024): 33.3 (#258), Kimi K2 (Jul 2025): 42.4 (#102)
| Benchmark | Grok-2 (Dec 2024) | Kimi K2 (Jul 2025) |
|---|---|---|
| WeirdML | 22.2% | 42.8% |
| LMArena Coding | 1287 | 1399 |
| SWE-bench Verified (bash only) | — | 63.4% |
| Aider Polyglot | — | 59.1% |
| GSO | — | 4.9% |
| LiveBench Coding | 46.4% | — |
| ALE-Bench | — | 597.5 |
Agentic & Tool Use Not comparable
Grok-2 (Dec 2024): —, Kimi K2 (Jul 2025): 32.4 (#64)
| Benchmark | Grok-2 (Dec 2024) | Kimi K2 (Jul 2025) |
|---|---|---|
| Terminal-Bench | — | 35.7% |
| Berkeley Function Calling Leaderboard | — | 59.1% |
| METR Time Horizons | — | 59.2% |
Reasoning Kimi K2 (Jul 2025) leads
Grok-2 (Dec 2024): 16.9 (#299), Kimi K2 (Jul 2025): 23.3 (#179)
| Benchmark | Grok-2 (Dec 2024) | Kimi K2 (Jul 2025) |
|---|---|---|
| SimpleBench | 22.7% | 26.3% |
| LMArena Hard Prompts | 1272 | 1384 |
| Epoch Capabilities Index | 130.48 | 146.01 |
| Kagi LLM Benchmark | — | 64.4% |
| LiveBench Reasoning | 54.8% | — |
| DTBench | 65.2% | — |
| LiveBench Data Analysis | 54.5% | — |
| ForecastBench | — | 60.2 |
| LiveBench | 54.3% | — |
Math Kimi K2 (Jul 2025) leads
Grok-2 (Dec 2024): 20.8 (#284), Kimi K2 (Jul 2025): 42.7 (#83)
| Benchmark | Grok-2 (Dec 2024) | Kimi K2 (Jul 2025) |
|---|---|---|
| LMArena Math | 1283 | 1397 |
| FrontierMath (Feb 2025 set) | 0.7% | 21.4% |
| OTIS Mock AIME 2024-2025 | 11.5% | — |
| Omni-MATH | — | 65.4% |
| LiveBench Math | 54.9% | — |
| MATH Level 5 | 63.5% | — |
| FrontierMath Tier 4 (v1) | — | 0% |
Knowledge Kimi K2 (Jul 2025) leads
Grok-2 (Dec 2024): 29.8 (#233), Kimi K2 (Jul 2025): 37.3 (#157)
| Benchmark | Grok-2 (Dec 2024) | Kimi K2 (Jul 2025) |
|---|---|---|
| Confabulations | 20.1% | 20.4% |
| LMArena Expert | 1254 | 1365 |
| GPQA Diamond | 53.8% | — |
| MMLU-Pro | — | 81.9% |
| Vectara Hallucination Rate | — | 17.9% |
| GPQA (HELM) | — | 65.3% |
Multilingual Kimi K2 (Jul 2025) leads
Grok-2 (Dec 2024): 43.1 (#188), Kimi K2 (Jul 2025): 49.6 (#130)
| Benchmark | Grok-2 (Dec 2024) | Kimi K2 (Jul 2025) |
|---|---|---|
| LMArena Non-English | 1282 | 1372 |
| LMArena Chinese | 1289 | 1415 |
| LMArena French | 1318 | 1379 |
| LMArena German | 1287 | 1387 |
| LMArena Japanese | 1244 | 1349 |
| LMArena Korean | 1237 | 1325 |
| LMArena Russian | 1286 | 1385 |
| LMArena Spanish | 1281 | 1386 |
Instruction Following Kimi K2 (Jul 2025) leads
Grok-2 (Dec 2024): 66.9 (#202), Kimi K2 (Jul 2025): 71.1 (#156)
| Benchmark | Grok-2 (Dec 2024) | Kimi K2 (Jul 2025) |
|---|---|---|
| LMArena Instruction Following | 1270 | 1348 |
| LiveBench Instruction Following | 69.6% | — |
| IFEval | — | 85% |
Long Context Kimi K2 (Jul 2025) leads
Grok-2 (Dec 2024): 38.8 (#190), Kimi K2 (Jul 2025): 41.2 (#145)
| Benchmark | Grok-2 (Dec 2024) | Kimi K2 (Jul 2025) |
|---|---|---|
| LMArena Longer Query | 1276 | 1353 |
| Fiction.LiveBench | — | 66.7% |
| CL-bench | — | 17.6% |
Writing & Preference Kimi K2 (Jul 2025) leads
Grok-2 (Dec 2024): 48.6 (#198), Kimi K2 (Jul 2025): 62.3 (#78)
| Benchmark | Grok-2 (Dec 2024) | Kimi K2 (Jul 2025) |
|---|---|---|
| LMArena Text | 1305 | 1380 |
| LMArena Creative Writing | 1284 | 1350 |
| Short-Story Creative Writing | 63.6% | 85.6% |
| LMArena Multi-Turn | 1290 | 1371 |
| EQ-Bench Creative Writing | — | 1666 |
| WildBench | — | 86.2% |
| LiveBench Language | 45.6% | — |
Frequently asked questions
Is Grok-2 (Dec 2024) better than Kimi K2 (Jul 2025)?
Kimi K2 (Jul 2025) is the stronger model overall, scoring 41.2 to 33.7 on the Noometry Index.
Is Grok-2 (Dec 2024) or Kimi K2 (Jul 2025) better for coding?
Kimi K2 (Jul 2025) scores higher on coding benchmarks: 42.4 versus 33.3 in the Noometry coding category.
How many benchmarks do Grok-2 (Dec 2024) and Kimi K2 (Jul 2025) share?
23 benchmarks have published results for both models. Grok-2 (Dec 2024) has 34 scored results on Noometry and Kimi K2 (Jul 2025) has 42.