Model comparison
Kimi K2.5 vs Yi-Lightning
Kimi K2.5 is the stronger model overall, scoring 48.1 to 37.1 on the Noometry Index.
Last verified . 17 shared benchmarks.
Summary
- They share 17 benchmarks with published results for both. Kimi K2.5 scores higher in 8 categories and Yi-Lightning in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in coding, where Kimi K2.5 leads 48.8 to 27.4.
- Kimi K2.5 has downloadable open weights; the other is API-only.
Side by side
| Kimi K2.5 | Yi-Lightning | |
|---|---|---|
| Provider | Moonshot AI | 01.AI |
| Noometry Index | 48.1 | 37.1 |
| Released | 2026-01-27 | 2024-12-02 |
| Weights | Open | Proprietary |
| Context window | 262K | — |
| Max output | 262K | — |
| Input $ / M tokens | $0.45 | — |
| Output $ / M tokens | $2.25 | — |
| Results tracked | 51 | 18 |
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Category by category
Coding Kimi K2.5 leads
Kimi K2.5: 48.8 (#53), Yi-Lightning: 27.4 (#320)
| Benchmark | Kimi K2.5 | Yi-Lightning |
|---|---|---|
| LMArena Coding | 1474 | 1312 |
| SWE-bench Verified | 73.8% | — |
| SWE-bench Verified (bash only) | 70.8% | — |
| Aider Polyglot | — | 12.9% |
| LMArena WebDev | 1437 | — |
| SWE-bench Multilingual | 67.3% | — |
| SciCode | 49% | — |
| WeirdML | 45.6% | — |
| ALE-Bench | 821.65 | — |
Agentic & Tool Use Not comparable
Kimi K2.5: 34.2 (#48), Yi-Lightning: —
| Benchmark | Kimi K2.5 | Yi-Lightning |
|---|---|---|
| Terminal-Bench | 43.2% | — |
| OSWorld | 63.3% | — |
| Vending-Bench 2 | 1,198 | — |
Reasoning Kimi K2.5 leads
Kimi K2.5: 31.2 (#80), Yi-Lightning: 25.9 (#139)
| Benchmark | Kimi K2.5 | Yi-Lightning |
|---|---|---|
| LMArena Hard Prompts | 1453 | 1302 |
| ARC-AGI-2 | 11.8% | — |
| SimpleBench | 46.8% | — |
| Kagi LLM Benchmark | 78.5% | — |
| NYT Connections (extended) | 69.9% | — |
| ARC-AGI-1 | 65.3% | — |
| CritPt | 3.1% | — |
| Chess Puzzles | 12% | — |
| EnigmaEval | 3.4% | — |
| Thematic Generalization | 69.4% | — |
| Epoch Capabilities Index | 148.03 | — |
Math Kimi K2.5 leads
Kimi K2.5: 51.8 (#53), Yi-Lightning: 36.2 (#172)
| Benchmark | Kimi K2.5 | Yi-Lightning |
|---|---|---|
| LMArena Math | 1470 | 1300 |
| MathArena Final-Answer Competitions | 62.3% | — |
| OTIS Mock AIME 2024-2025 | 92.2% | — |
| FrontierMath (Feb 2025 set) | 27.9% | — |
| FrontierMath Tier 4 (v1) | 4.2% | — |
Knowledge Kimi K2.5 leads
Kimi K2.5: 53.6 (#56), Yi-Lightning: 35.4 (#185)
| Benchmark | Kimi K2.5 | Yi-Lightning |
|---|---|---|
| LMArena Expert | 1466 | 1286 |
| GPQA Diamond | 87.6% | — |
| Humanity's Last Exam | 24.4% | — |
| SimpleQA Verified | 34.3% | — |
| Vectara Hallucination Rate | 14.2% | — |
Multimodal Not comparable
Kimi K2.5: 41.1 (#39), Yi-Lightning: —
| Benchmark | Kimi K2.5 | Yi-Lightning |
|---|---|---|
| LMArena Vision | 1269 | — |
| LMArena Document | 1430 | — |
Multilingual Kimi K2.5 leads
Kimi K2.5: 53.9 (#53), Yi-Lightning: 42.2 (#196)
| Benchmark | Kimi K2.5 | Yi-Lightning |
|---|---|---|
| LMArena Non-English | 1433 | 1269 |
| LMArena Chinese | 1495 | 1320 |
| LMArena French | 1454 | 1305 |
| LMArena German | 1441 | 1267 |
| LMArena Japanese | 1421 | 1228 |
| LMArena Korean | 1410 | 1192 |
| LMArena Russian | 1435 | 1255 |
| LMArena Spanish | 1450 | 1315 |
Instruction Following Kimi K2.5 leads
Kimi K2.5: 75.3 (#64), Yi-Lightning: 67.4 (#196)
| Benchmark | Kimi K2.5 | Yi-Lightning |
|---|---|---|
| LMArena Instruction Following | 1431 | 1278 |
Long Context Kimi K2.5 leads
Kimi K2.5: 52.1 (#7), Yi-Lightning: 39.4 (#181)
| Benchmark | Kimi K2.5 | Yi-Lightning |
|---|---|---|
| LMArena Longer Query | 1445 | 1297 |
| Fiction.LiveBench | 86.1% | — |
| CL-bench | 19.3% | — |
| CL-bench Life | 13.2% | — |
Writing & Preference Kimi K2.5 leads
Kimi K2.5: 65.1 (#53), Yi-Lightning: 50.2 (#184)
| Benchmark | Kimi K2.5 | Yi-Lightning |
|---|---|---|
| LMArena Text | 1445 | 1302 |
| LMArena Creative Writing | 1423 | 1280 |
| LMArena Multi-Turn | 1444 | 1311 |
| EQ-Bench Creative Writing | 1579 | — |
Frequently asked questions
Is Kimi K2.5 better than Yi-Lightning?
Kimi K2.5 is the stronger model overall, scoring 48.1 to 37.1 on the Noometry Index.
Is Kimi K2.5 or Yi-Lightning better for coding?
Kimi K2.5 scores higher on coding benchmarks: 48.8 versus 27.4 in the Noometry coding category.
How many benchmarks do Kimi K2.5 and Yi-Lightning share?
17 benchmarks have published results for both models. Kimi K2.5 has 51 scored results on Noometry and Yi-Lightning has 18.