Model comparison
Grok 4 vs Yi-Lightning
Grok 4 is the stronger model overall, scoring 47.8 to 36.5 on the Noometry Index.
Last verified . 18 shared benchmarks.
Summary
- They share 18 benchmarks with published results for both. Grok 4 scores higher in 8 categories and Yi-Lightning in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in long context, where Grok 4 leads 63.1 to 39.4.
- The biggest single-benchmark swing is Aider Polyglot: 79.6% for Grok 4 and 12.9% for Yi-Lightning.
Side by side
| Grok 4 | Yi-Lightning | |
|---|---|---|
| Provider | xAI | 01.AI |
| Noometry Index | 47.8 | 36.5 |
| Released | 2025-07-09 | 2024-12-02 |
| Weights | Proprietary | Proprietary |
| Context window | — | — |
| Max output | — | — |
| Input $ / M tokens | — | — |
| Output $ / M tokens | — | — |
| Results tracked | 48 | 18 |
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Category by category
Coding Grok 4 leads
Grok 4: 49.9 (#44), Yi-Lightning: 27.0 (#315)
| Benchmark | Grok 4 | Yi-Lightning |
|---|---|---|
| Aider Polyglot | 79.6% | 12.9% |
| LMArena Coding | 1408 | 1313 |
| WeirdML | 45.7% | — |
Agentic & Tool Use Not comparable
Grok 4: 32.1 (#62), Yi-Lightning: —
| Benchmark | Grok 4 | Yi-Lightning |
|---|---|---|
| Terminal-Bench | 27.2% | — |
| Berkeley Function Calling Leaderboard | 63% | — |
| GDPval | 21.1% | — |
| Cybench | 43% | — |
| DeepResearch Bench | 47.3% | — |
| BALROG | 43.6% | — |
| LMArena Search | 1142 | — |
| METR Time Horizons | 66.6% | — |
Reasoning Grok 4 leads
Grok 4: 36.9 (#59), Yi-Lightning: 24.9 (#137)
| Benchmark | Grok 4 | Yi-Lightning |
|---|---|---|
| LMArena Hard Prompts | 1409 | 1302 |
| ARC-AGI-2 | 16% | — |
| SimpleBench | 60.5% | — |
| Kagi LLM Benchmark | 73.6% | — |
| ARC-AGI-1 | 66.7% | — |
| Chess Puzzles | 28% | — |
| Epoch Capabilities Index | 146.46 | — |
| ForecastBench | 60.9 | — |
Math Grok 4 leads
Grok 4: 46.5 (#58), Yi-Lightning: 33.5 (#173)
| Benchmark | Grok 4 | Yi-Lightning |
|---|---|---|
| LMArena Math | 1422 | 1300 |
| OTIS Mock AIME 2024-2025 | 84% | — |
| Omni-MATH | 60.3% | — |
| FrontierMath (Feb 2025 set) | 19.7% | — |
| FrontierMath Tier 4 (v1) | 2.1% | — |
Knowledge Grok 4 leads
Grok 4: 53.7 (#50), Yi-Lightning: 34.8 (#182)
| Benchmark | Grok 4 | Yi-Lightning |
|---|---|---|
| LMArena Expert | 1417 | 1286 |
| GPQA Diamond | 87% | — |
| MMLU-Pro | 85.1% | — |
| Confabulations | 12.4% | — |
| GPQA (HELM) | 72.7% | — |
Multimodal Not comparable
Grok 4: 33.1 (#89), Yi-Lightning: —
| Benchmark | Grok 4 | Yi-Lightning |
|---|---|---|
| LMArena Vision | 1211 | — |
| GeoBench | 45% | — |
Multilingual Grok 4 leads
Grok 4: 52.0 (#98), Yi-Lightning: 42.4 (#191)
| Benchmark | Grok 4 | Yi-Lightning |
|---|---|---|
| LMArena Non-English | 1403 | 1269 |
| LMArena Chinese | 1428 | 1320 |
| LMArena French | 1418 | 1304 |
| LMArena German | 1429 | 1267 |
| LMArena Japanese | 1396 | 1228 |
| LMArena Korean | 1376 | 1192 |
| LMArena Russian | 1409 | 1255 |
| LMArena Spanish | 1419 | 1315 |
Instruction Following Grok 4 leads
Grok 4: 79.4 (#4), Yi-Lightning: 67.6 (#191)
| Benchmark | Grok 4 | Yi-Lightning |
|---|---|---|
| LMArena Instruction Following | 1387 | 1278 |
| IFEval | 94.9% | — |
Long Context Grok 4 leads
Grok 4: 63.1 (#4), Yi-Lightning: 39.4 (#176)
| Benchmark | Grok 4 | Yi-Lightning |
|---|---|---|
| LMArena Longer Query | 1409 | 1297 |
| Fiction.LiveBench | 94.4% | — |
Writing & Preference Grok 4 leads
Grok 4: 58.7 (#111), Yi-Lightning: 50.4 (#178)
| Benchmark | Grok 4 | Yi-Lightning |
|---|---|---|
| LMArena Text | 1412 | 1302 |
| LMArena Creative Writing | 1397 | 1280 |
| LMArena Multi-Turn | 1416 | 1311 |
| Short-Story Creative Writing | 76.9% | — |
| WildBench | 79.7% | — |
Frequently asked questions
Is Grok 4 better than Yi-Lightning?
Grok 4 is the stronger model overall, scoring 47.8 to 36.5 on the Noometry Index.
Is Grok 4 or Yi-Lightning better for coding?
Grok 4 scores higher on coding benchmarks: 49.9 versus 27.0 in the Noometry coding category.
How many benchmarks do Grok 4 and Yi-Lightning share?
18 benchmarks have published results for both models. Grok 4 has 48 scored results on Noometry and Yi-Lightning has 18.