Model comparison
Claude Sonnet 4.5 vs ERNIE 5.1
Claude Sonnet 4.5 and ERNIE 5.1 score almost the same on the Noometry Index (44.1 vs 43.8), so choose on price, context window or the category you care about most.
Last verified . 19 shared benchmarks.
BaiduSummary
- They share 19 benchmarks with published results for both. Claude Sonnet 4.5 scores higher in 5 categories and ERNIE 5.1 in 3 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in math, where ERNIE 5.1 leads 40.3 to 32.3.
- The biggest single-benchmark swing is NYT Connections (extended): 37.3% for Claude Sonnet 4.5 and 23.4% for ERNIE 5.1.
Side by side
| Claude Sonnet 4.5 | ERNIE 5.1 | |
|---|---|---|
| Provider | Anthropic | Baidu |
| Noometry Index | 44.1 | 43.8 |
| Released | 2025-09-29 | — |
| Weights | Proprietary | Proprietary |
| Context window | 200K | — |
| Max output | 64K | — |
| Input $ / M tokens | $3 | — |
| Output $ / M tokens | $15 | — |
| Results tracked | 73 | 19 |
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Category by category
Coding Claude Sonnet 4.5 leads
Claude Sonnet 4.5: 47.3 (#61), ERNIE 5.1: 44.0 (#76)
| Benchmark | Claude Sonnet 4.5 | ERNIE 5.1 |
|---|---|---|
| LMArena Coding | 1489 | 1488 |
| SWE-bench Verified | 71.3% | — |
| SWE-bench Verified (bash only) | 71.4% | — |
| LMArena WebDev | 1393 | — |
| SWE-bench Multilingual | 67% | — |
| SciCode | 44.7% | — |
| GSO | 14.7% | — |
| WeirdML | 47.7% | — |
| ALE-Bench | 796.15 | — |
| AlgoTune | 1.52 | — |
Agentic & Tool Use Not comparable
Claude Sonnet 4.5: 38.3 (#32), ERNIE 5.1: —
| Benchmark | Claude Sonnet 4.5 | ERNIE 5.1 |
|---|---|---|
| LMArena Search | 1159 | 1227 |
| Terminal-Bench | 46.5% | — |
| Berkeley Function Calling Leaderboard | 73.2% | — |
| GDPval | 42.5% | — |
| Remote Labor Index | 2.1% | — |
| τ²-bench Airline | 72% | — |
| τ²-bench Banking | 25.3% | — |
| τ²-bench Retail | 72.4% | — |
| τ²-bench Telecom | 84.9% | — |
| Cybench | 60% | — |
| DeepResearch Bench | 52.6% | — |
| OSWorld | 62.9% | — |
| METR Time Horizons | 67.4% | — |
| Vending-Bench 2 | 3,839 | — |
Reasoning Claude Sonnet 4.5 leads
Claude Sonnet 4.5: 26.9 (#125), ERNIE 5.1: 21.9 (#211)
| Benchmark | Claude Sonnet 4.5 | ERNIE 5.1 |
|---|---|---|
| NYT Connections (extended) | 37.3% | 23.4% |
| LMArena Hard Prompts | 1462 | 1481 |
| ARC-AGI-2 | 13.6% | — |
| SimpleBench | 54.3% | — |
| Kagi LLM Benchmark | 57.9% | — |
| ARC-AGI-1 | 63.7% | — |
| CritPt | 1.1% | — |
| Chess Puzzles | 12% | — |
| EnigmaEval | 6% | — |
| EBR-Bench | 2.4% | — |
| Mystery Game Puzzles | 17% | — |
| DTBench | 83.2% | — |
| LMCA | 38.8% | — |
| Epoch Capabilities Index | 146.84 | — |
| ForecastBench | 61.9 | — |
Math ERNIE 5.1 leads
Claude Sonnet 4.5: 32.3 (#216), ERNIE 5.1: 40.3 (#92)
| Benchmark | Claude Sonnet 4.5 | ERNIE 5.1 |
|---|---|---|
| LMArena Math | 1449 | 1481 |
| FrontierMath (Tiers 1-3) | 23.9% | — |
| FrontierMath Tier 4 | 2.4% | — |
| OTIS Mock AIME 2024-2025 | 77.8% | — |
| ProofBench | 19% | — |
| Omni-MATH | 55.3% | — |
| MATH Level 5 | 97.7% | — |
| FrontierMath (Feb 2025 set) | 15.2% | — |
| FrontierMath Tier 4 (v1) | 4.2% | — |
Knowledge Claude Sonnet 4.5 leads
Claude Sonnet 4.5: 48.4 (#76), ERNIE 5.1: 41.9 (#102)
| Benchmark | Claude Sonnet 4.5 | ERNIE 5.1 |
|---|---|---|
| LMArena Expert | 1482 | 1492 |
| GPQA Diamond | 82.3% | — |
| Humanity's Last Exam | 13.7% | — |
| SimpleQA Verified | 30.7% | — |
| MMLU-Pro | 86.9% | — |
| Vectara Hallucination Rate | 12% | — |
| GPQA (HELM) | 68.6% | — |
Multimodal Not comparable
Claude Sonnet 4.5: 34.8 (#89), ERNIE 5.1: —
| Benchmark | Claude Sonnet 4.5 | ERNIE 5.1 |
|---|---|---|
| VPCT | 39.8% | — |
| LMArena Document | 1450 | — |
Multilingual ERNIE 5.1 leads
Claude Sonnet 4.5: 53.4 (#69), ERNIE 5.1: 55.5 (#29)
| Benchmark | Claude Sonnet 4.5 | ERNIE 5.1 |
|---|---|---|
| LMArena Non-English | 1425 | 1454 |
| LMArena Chinese | 1459 | 1508 |
| LMArena French | 1458 | 1488 |
| LMArena German | 1427 | 1470 |
| LMArena Japanese | 1390 | 1422 |
| LMArena Korean | 1403 | 1427 |
| LMArena Russian | 1437 | 1459 |
| LMArena Spanish | 1457 | 1473 |
Instruction Following ERNIE 5.1 leads
Claude Sonnet 4.5: 75.0 (#78), ERNIE 5.1: 76.7 (#37)
| Benchmark | Claude Sonnet 4.5 | ERNIE 5.1 |
|---|---|---|
| LMArena Instruction Following | 1459 | 1460 |
| IFEval | 85% | — |
Long Context Too close to call
Claude Sonnet 4.5: 45.2 (#46), ERNIE 5.1: 44.7 (#59)
| Benchmark | Claude Sonnet 4.5 | ERNIE 5.1 |
|---|---|---|
| LMArena Longer Query | 1476 | 1462 |
Writing & Preference Claude Sonnet 4.5 leads
Claude Sonnet 4.5: 66.5 (#34), ERNIE 5.1: 65.1 (#52)
| Benchmark | Claude Sonnet 4.5 | ERNIE 5.1 |
|---|---|---|
| LMArena Text | 1439 | 1468 |
| LMArena Creative Writing | 1442 | 1441 |
| LMArena Multi-Turn | 1465 | 1471 |
| EQ-Bench Creative Writing | 1678 | — |
| WildBench | 85.4% | — |
Frequently asked questions
Is Claude Sonnet 4.5 better than ERNIE 5.1?
Claude Sonnet 4.5 and ERNIE 5.1 score almost the same on the Noometry Index (44.1 vs 43.8), so choose on price, context window or the category you care about most.
Is Claude Sonnet 4.5 or ERNIE 5.1 better for coding?
Claude Sonnet 4.5 scores higher on coding benchmarks: 47.3 versus 44.0 in the Noometry coding category.
How many benchmarks do Claude Sonnet 4.5 and ERNIE 5.1 share?
19 benchmarks have published results for both models. Claude Sonnet 4.5 has 73 scored results on Noometry and ERNIE 5.1 has 19.