Model comparison
Grok 4.1 vs Kimi K2.5 Instant
Kimi K2.5 Instant is the stronger model overall, scoring 42.9 to 40.8 on the Noometry Index.
Last verified . 17 shared benchmarks.
Summary
- They share 17 benchmarks with published results for both. Grok 4.1 scores higher in 2 categories and Kimi K2.5 Instant in 6 categories; 4 gaps are clear of the uncertainty.
- The widest gap is in coding, where Kimi K2.5 Instant leads 42.3 to 33.4.
- Kimi K2.5 Instant has downloadable open weights; the other is API-only.
Side by side
| Grok 4.1 | Kimi K2.5 Instant | |
|---|---|---|
| Provider | xAI | Moonshot AI |
| Noometry Index | 40.8 | 42.9 |
| Released | 2025-11-17 | — |
| Weights | Proprietary | Open |
| Context window | — | — |
| Max output | — | — |
| Input $ / M tokens | — | — |
| Output $ / M tokens | — | — |
| Results tracked | 19 | 18 |
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Category by category
Coding Kimi K2.5 Instant leads
Grok 4.1: 33.4 (#246), Kimi K2.5 Instant: 42.3 (#95)
| Benchmark | Grok 4.1 | Kimi K2.5 Instant |
|---|---|---|
| LMArena WebDev | 1214 | 1404 |
| LMArena Coding | 1445 | 1483 |
Agentic & Tool Use Not comparable
Grok 4.1: 33.8 (#47), Kimi K2.5 Instant: —
| Benchmark | Grok 4.1 | Kimi K2.5 Instant |
|---|---|---|
| Cybench | 39% | — |
Reasoning Too close to call
Grok 4.1: 28.3 (#91), Kimi K2.5 Instant: 28.5 (#88)
| Benchmark | Grok 4.1 | Kimi K2.5 Instant |
|---|---|---|
| LMArena Hard Prompts | 1436 | 1443 |
Math Too close to call
Grok 4.1: 36.2 (#124), Kimi K2.5 Instant: 36.6 (#105)
| Benchmark | Grok 4.1 | Kimi K2.5 Instant |
|---|---|---|
| LMArena Math | 1422 | 1443 |
Knowledge Too close to call
Grok 4.1: 38.9 (#129), Kimi K2.5 Instant: 39.5 (#121)
| Benchmark | Grok 4.1 | Kimi K2.5 Instant |
|---|---|---|
| LMArena Expert | 1417 | 1438 |
Multimodal Not comparable
Grok 4.1: —, Kimi K2.5 Instant: 39.5 (#47)
| Benchmark | Grok 4.1 | Kimi K2.5 Instant |
|---|---|---|
| LMArena Vision | — | 1254 |
Multilingual Grok 4.1 leads
Grok 4.1: 53.6 (#64), Kimi K2.5 Instant: 52.2 (#89)
| Benchmark | Grok 4.1 | Kimi K2.5 Instant |
|---|---|---|
| LMArena Non-English | 1425 | 1406 |
| LMArena Chinese | 1464 | 1450 |
| LMArena French | 1448 | 1403 |
| LMArena German | 1447 | 1413 |
| LMArena Korean | 1407 | 1378 |
| LMArena Russian | 1434 | 1404 |
| LMArena Spanish | 1438 | 1448 |
| LMArena Japanese | 1396 | — |
Instruction Following Kimi K2.5 Instant leads
Grok 4.1: 74.0 (#106), Kimi K2.5 Instant: 75.5 (#61)
| Benchmark | Grok 4.1 | Kimi K2.5 Instant |
|---|---|---|
| LMArena Instruction Following | 1400 | 1430 |
Long Context Too close to call
Grok 4.1: 43.2 (#96), Kimi K2.5 Instant: 43.8 (#82)
| Benchmark | Grok 4.1 | Kimi K2.5 Instant |
|---|---|---|
| LMArena Longer Query | 1416 | 1435 |
Writing & Preference Grok 4.1 leads
Grok 4.1: 62.6 (#71), Kimi K2.5 Instant: 60.8 (#91)
| Benchmark | Grok 4.1 | Kimi K2.5 Instant |
|---|---|---|
| LMArena Text | 1437 | 1420 |
| LMArena Creative Writing | 1411 | 1379 |
| LMArena Multi-Turn | 1438 | 1427 |
Frequently asked questions
Is Grok 4.1 better than Kimi K2.5 Instant?
Kimi K2.5 Instant is the stronger model overall, scoring 42.9 to 40.8 on the Noometry Index.
Is Grok 4.1 or Kimi K2.5 Instant better for coding?
Kimi K2.5 Instant scores higher on coding benchmarks: 42.3 versus 33.4 in the Noometry coding category.
How many benchmarks do Grok 4.1 and Kimi K2.5 Instant share?
17 benchmarks have published results for both models. Grok 4.1 has 19 scored results on Noometry and Kimi K2.5 Instant has 18.