Model comparison
ERNIE 5.1 vs Grok 4.1 Fast
ERNIE 5.1 is the stronger model overall, scoring 43.8 to 41.4 on the Noometry Index.
Last verified . 19 shared benchmarks.
BaiduSummary
- They share 19 benchmarks with published results for both. ERNIE 5.1 scores higher in 7 categories and Grok 4.1 Fast in 1 category; 8 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.1 Fast leads 43.4 to 21.9.
- The biggest single-benchmark swing is NYT Connections (extended): 23.4% for ERNIE 5.1 and 87.4% for Grok 4.1 Fast.
Side by side
| ERNIE 5.1 | Grok 4.1 Fast | |
|---|---|---|
| Provider | Baidu | xAI |
| Noometry Index | 43.8 | 41.4 |
| Released | — | 2025-06-27 |
| Weights | Proprietary | Proprietary |
| Context window | — | 128K |
| Max output | — | 30K |
| Input $ / M tokens | — | $0.20 |
| Output $ / M tokens | — | $0.50 |
| Results tracked | 19 | 32 |
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Category by category
Coding ERNIE 5.1 leads
ERNIE 5.1: 44.0 (#76), Grok 4.1 Fast: 34.1 (#245)
| Benchmark | ERNIE 5.1 | Grok 4.1 Fast |
|---|---|---|
| LMArena Coding | 1488 | 1411 |
| LMArena WebDev | — | 1242 |
| ALE-Bench | — | 394.93 |
Agentic & Tool Use Not comparable
ERNIE 5.1: —, Grok 4.1 Fast: 36.3 (#39)
| Benchmark | ERNIE 5.1 | Grok 4.1 Fast |
|---|---|---|
| LMArena Search | 1227 | 1171 |
| Berkeley Function Calling Leaderboard | — | 69.6% |
| τ²-bench Banking | — | 13.1% |
| Vending-Bench 2 | — | 1,107 |
Reasoning Grok 4.1 Fast leads
ERNIE 5.1: 21.9 (#211), Grok 4.1 Fast: 43.4 (#49)
| Benchmark | ERNIE 5.1 | Grok 4.1 Fast |
|---|---|---|
| NYT Connections (extended) | 23.4% | 87.4% |
| LMArena Hard Prompts | 1481 | 1407 |
| SimpleBench | — | 56% |
| DTBench | — | 87.7% |
| ForecastBench | — | 61 |
Math ERNIE 5.1 leads
ERNIE 5.1: 40.3 (#92), Grok 4.1 Fast: 31.9 (#221)
| Benchmark | ERNIE 5.1 | Grok 4.1 Fast |
|---|---|---|
| LMArena Math | 1481 | 1408 |
| MathArena Final-Answer Competitions | — | 60.9% |
| ProofBench | — | 4% |
Knowledge ERNIE 5.1 leads
ERNIE 5.1: 41.9 (#102), Grok 4.1 Fast: 33.1 (#207)
| Benchmark | ERNIE 5.1 | Grok 4.1 Fast |
|---|---|---|
| LMArena Expert | 1492 | 1399 |
| Vectara Hallucination Rate | — | 17.8% |
Multimodal Not comparable
ERNIE 5.1: —, Grok 4.1 Fast: 37.0 (#76)
| Benchmark | ERNIE 5.1 | Grok 4.1 Fast |
|---|---|---|
| LMArena Vision | — | 1201 |
Multilingual ERNIE 5.1 leads
ERNIE 5.1: 55.5 (#29), Grok 4.1 Fast: 51.0 (#114)
| Benchmark | ERNIE 5.1 | Grok 4.1 Fast |
|---|---|---|
| LMArena Non-English | 1454 | 1391 |
| LMArena Chinese | 1508 | 1441 |
| LMArena French | 1488 | 1415 |
| LMArena German | 1470 | 1404 |
| LMArena Japanese | 1422 | 1349 |
| LMArena Korean | 1427 | 1361 |
| LMArena Russian | 1459 | 1387 |
| LMArena Spanish | 1473 | 1413 |
Instruction Following ERNIE 5.1 leads
ERNIE 5.1: 76.7 (#37), Grok 4.1 Fast: 72.7 (#133)
| Benchmark | ERNIE 5.1 | Grok 4.1 Fast |
|---|---|---|
| LMArena Instruction Following | 1460 | 1376 |
Long Context ERNIE 5.1 leads
ERNIE 5.1: 44.7 (#59), Grok 4.1 Fast: 42.4 (#126)
| Benchmark | ERNIE 5.1 | Grok 4.1 Fast |
|---|---|---|
| LMArena Longer Query | 1462 | 1390 |
Writing & Preference ERNIE 5.1 leads
ERNIE 5.1: 65.1 (#52), Grok 4.1 Fast: 57.2 (#131)
| Benchmark | ERNIE 5.1 | Grok 4.1 Fast |
|---|---|---|
| LMArena Text | 1468 | 1408 |
| LMArena Creative Writing | 1441 | 1394 |
| LMArena Multi-Turn | 1471 | 1389 |
| EQ-Bench Creative Writing | — | 1327 |
Frequently asked questions
Is ERNIE 5.1 better than Grok 4.1 Fast?
ERNIE 5.1 is the stronger model overall, scoring 43.8 to 41.4 on the Noometry Index.
Is ERNIE 5.1 or Grok 4.1 Fast better for coding?
ERNIE 5.1 scores higher on coding benchmarks: 44.0 versus 34.1 in the Noometry coding category.
How many benchmarks do ERNIE 5.1 and Grok 4.1 Fast share?
19 benchmarks have published results for both models. ERNIE 5.1 has 19 scored results on Noometry and Grok 4.1 Fast has 32.