Model comparison
Grok 3 vs Kimi K2.5 Instant
Kimi K2.5 Instant is the stronger model overall, scoring 43.6 to 39.9 on the Noometry Index.
Last verified . 16 shared benchmarks.
Summary
- They share 16 benchmarks with published results for both. Grok 3 scores higher in 2 categories and Kimi K2.5 Instant in 6 categories; 5 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Kimi K2.5 Instant leads 29.7 to 13.7.
- Kimi K2.5 Instant has downloadable open weights; the other is API-only.
Side by side
| Grok 3 | Kimi K2.5 Instant | |
|---|---|---|
| Provider | xAI | Moonshot AI |
| Noometry Index | 39.9 | 43.6 |
| Released | 2025-04-09 | — |
| Weights | Proprietary | Open |
| Context window | — | — |
| Max output | — | — |
| Input $ / M tokens | — | — |
| Output $ / M tokens | — | — |
| Results tracked | 40 | 18 |
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Category by category
Coding Too close to call
Grok 3: 41.9 (#115), Kimi K2.5 Instant: 42.6 (#97)
| Benchmark | Grok 3 | Kimi K2.5 Instant |
|---|---|---|
| LMArena Coding | 1432 | 1484 |
| Aider Polyglot | 53.3% | — |
| LMArena WebDev | — | 1404 |
| WeirdML | 37.2% | — |
Agentic & Tool Use Not comparable
Grok 3: 30.5 (#76), Kimi K2.5 Instant: —
| Benchmark | Grok 3 | Kimi K2.5 Instant |
|---|---|---|
| BALROG | 29.5% | — |
Reasoning Kimi K2.5 Instant leads
Grok 3: 13.7 (#333), Kimi K2.5 Instant: 29.7 (#90)
| Benchmark | Grok 3 | Kimi K2.5 Instant |
|---|---|---|
| LMArena Hard Prompts | 1434 | 1443 |
| ARC-AGI-2 | 0% | — |
| SimpleBench | 36.1% | — |
| Kagi LLM Benchmark | 61.3% | — |
| ARC-AGI-1 | 5.5% | — |
| Epoch Capabilities Index | 138.33 | — |
Math Kimi K2.5 Instant leads
Grok 3: 38.0 (#145), Kimi K2.5 Instant: 39.4 (#105)
| Benchmark | Grok 3 | Kimi K2.5 Instant |
|---|---|---|
| LMArena Math | 1391 | 1442 |
| OTIS Mock AIME 2024-2025 | 55.6% | — |
| Omni-MATH | 46.4% | — |
| MATH Level 5 | 88.7% | — |
| FrontierMath (Feb 2025 set) | 3.8% | — |
| FrontierMath Tier 4 (v1) | 0% | — |
Knowledge Grok 3 leads
Grok 3: 46.2 (#82), Kimi K2.5 Instant: 40.2 (#123)
| Benchmark | Grok 3 | Kimi K2.5 Instant |
|---|---|---|
| LMArena Expert | 1421 | 1440 |
| GPQA Diamond | 75.8% | — |
| MMLU-Pro | 78.8% | — |
| Confabulations | 14.2% | — |
| Vectara Hallucination Rate | 5.8% | — |
| GPQA (HELM) | 65% | — |
Multimodal Not comparable
Grok 3: —, Kimi K2.5 Instant: 40.2 (#50)
| Benchmark | Grok 3 | Kimi K2.5 Instant |
|---|---|---|
| LMArena Vision | — | 1254 |
Multilingual Too close to call
Grok 3: 52.3 (#87), Kimi K2.5 Instant: 52.0 (#94)
| Benchmark | Grok 3 | Kimi K2.5 Instant |
|---|---|---|
| LMArena Non-English | 1410 | 1406 |
| LMArena Chinese | 1448 | 1449 |
| LMArena French | 1460 | 1403 |
| LMArena German | 1431 | 1413 |
| LMArena Korean | 1373 | 1378 |
| LMArena Russian | 1416 | 1404 |
| LMArena Spanish | 1417 | 1447 |
| LMArena Japanese | 1387 | — |
Instruction Following Too close to call
Grok 3: 75.0 (#73), Kimi K2.5 Instant: 75.3 (#65)
| Benchmark | Grok 3 | Kimi K2.5 Instant |
|---|---|---|
| LMArena Instruction Following | 1409 | 1430 |
| IFEval | 88.4% | — |
Long Context Kimi K2.5 Instant leads
Grok 3: 38.7 (#192), Kimi K2.5 Instant: 43.9 (#83)
| Benchmark | Grok 3 | Kimi K2.5 Instant |
|---|---|---|
| LMArena Longer Query | 1439 | 1435 |
| Fiction.LiveBench | 58.3% | — |
Writing & Preference Kimi K2.5 Instant leads
Grok 3: 55.8 (#141), Kimi K2.5 Instant: 60.6 (#95)
| Benchmark | Grok 3 | Kimi K2.5 Instant |
|---|---|---|
| LMArena Text | 1426 | 1420 |
| LMArena Creative Writing | 1414 | 1381 |
| LMArena Multi-Turn | 1425 | 1427 |
| Short-Story Creative Writing | 76.4% | — |
| EQ-Bench Creative Writing | 1186 | — |
| WildBench | 84.9% | — |
Frequently asked questions
Is Grok 3 better than Kimi K2.5 Instant?
Kimi K2.5 Instant is the stronger model overall, scoring 43.6 to 39.9 on the Noometry Index.
Is Grok 3 or Kimi K2.5 Instant better for coding?
They score almost the same on coding (41.9 vs 42.6); test both on your own repository before choosing.
How many benchmarks do Grok 3 and Kimi K2.5 Instant share?
16 benchmarks have published results for both models. Grok 3 has 40 scored results on Noometry and Kimi K2.5 Instant has 18.