Model comparison
Claude Sonnet 5.5 vs Llama 3.1 Nemotron 51b Instruct
Claude Sonnet 5.5 is the stronger model overall, scoring 61.9 to 35.9 on the Noometry Index.
Last verified . 12 shared benchmarks.
NVIDIASummary
- They share 12 benchmarks with published results for both. Claude Sonnet 5.5 scores higher in 8 categories and Llama 3.1 Nemotron 51b Instruct in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Sonnet 5.5 leads 87.9 to 34.6.
- Llama 3.1 Nemotron 51b Instruct has downloadable open weights; the other is API-only.
Side by side
| Claude Sonnet 5.5 | Llama 3.1 Nemotron 51b Instruct | |
|---|---|---|
| Provider | Anthropic | NVIDIA |
| Noometry Index | 61.9 | 35.9 |
| Released | 2026-09-28 | — |
| Weights | Proprietary | Open |
| Context window | 1M | — |
| Max output | 128K | — |
| Input $ / M tokens | $2 | — |
| Output $ / M tokens | $10 | — |
| Results tracked | 32 | 12 |
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Category by category
Coding Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 67.3 (#6), Llama 3.1 Nemotron 51b Instruct: 35.6 (#222)
| Benchmark | Claude Sonnet 5.5 | Llama 3.1 Nemotron 51b Instruct |
|---|---|---|
| LMArena Coding | 1513 | 1223 |
| FrontierCode | 52.1% | — |
| CursorBench | 55.5% | — |
| LMArena WebDev | 1774 | — |
| FrontierSWE | 61.9% | — |
| SciCode | 61% | — |
| ALE-Bench | 1,819 | — |
Agentic & Tool Use Not comparable
Claude Sonnet 5.5: 45.0 (#16), Llama 3.1 Nemotron 51b Instruct: —
| Benchmark | Claude Sonnet 5.5 | Llama 3.1 Nemotron 51b Instruct |
|---|---|---|
| APEX-Agents | 75.5% | — |
Reasoning Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 54.0 (#28), Llama 3.1 Nemotron 51b Instruct: 23.5 (#177)
| Benchmark | Claude Sonnet 5.5 | Llama 3.1 Nemotron 51b Instruct |
|---|---|---|
| LMArena Hard Prompts | 1495 | 1203 |
| NYT Connections (extended) | 80.5% | — |
| CritPt | 31.4% | — |
| Mystery Game Puzzles | 65% | — |
| Epoch Capabilities Index | 165.03 | — |
Math Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 87.9 (#6), Llama 3.1 Nemotron 51b Instruct: 34.6 (#193)
| Benchmark | Claude Sonnet 5.5 | Llama 3.1 Nemotron 51b Instruct |
|---|---|---|
| LMArena Math | 1510 | 1230 |
| FrontierMath (Tiers 1-3) | 88.8% | — |
| FrontierMath Tier 4 | 80.5% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| ProofBench | 100% | — |
| FrontierMath Erdős | 2.9% | — |
Knowledge Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 66.0 (#12), Llama 3.1 Nemotron 51b Instruct: 31.9 (#218)
| Benchmark | Claude Sonnet 5.5 | Llama 3.1 Nemotron 51b Instruct |
|---|---|---|
| LMArena Expert | 1540 | 1167 |
| GPQA Diamond | 95.6% | — |
| SimpleQA Verified | 46.5% | — |
Multimodal Not comparable
Claude Sonnet 5.5: 51.5 (#6), Llama 3.1 Nemotron 51b Instruct: —
| Benchmark | Claude Sonnet 5.5 | Llama 3.1 Nemotron 51b Instruct |
|---|---|---|
| LMArena Vision | 1289 | — |
| Furniture Assembly | 75% | — |
Multilingual Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 55.3 (#30), Llama 3.1 Nemotron 51b Instruct: 36.1 (#241)
| Benchmark | Claude Sonnet 5.5 | Llama 3.1 Nemotron 51b Instruct |
|---|---|---|
| LMArena Non-English | 1452 | 1181 |
| LMArena Chinese | 1522 | 1180 |
| LMArena Russian | 1451 | 1187 |
Instruction Following Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 78.3 (#11), Llama 3.1 Nemotron 51b Instruct: 62.9 (#233)
| Benchmark | Claude Sonnet 5.5 | Llama 3.1 Nemotron 51b Instruct |
|---|---|---|
| LMArena Instruction Following | 1495 | 1201 |
Long Context Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 45.9 (#28), Llama 3.1 Nemotron 51b Instruct: 36.5 (#230)
| Benchmark | Claude Sonnet 5.5 | Llama 3.1 Nemotron 51b Instruct |
|---|---|---|
| LMArena Longer Query | 1498 | 1205 |
Writing & Preference Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 66.0 (#40), Llama 3.1 Nemotron 51b Instruct: 43.4 (#229)
| Benchmark | Claude Sonnet 5.5 | Llama 3.1 Nemotron 51b Instruct |
|---|---|---|
| LMArena Text | 1471 | 1228 |
| LMArena Creative Writing | 1465 | 1213 |
| LMArena Multi-Turn | 1474 | 1227 |
Frequently asked questions
Is Claude Sonnet 5.5 better than Llama 3.1 Nemotron 51b Instruct?
Claude Sonnet 5.5 is the stronger model overall, scoring 61.9 to 35.9 on the Noometry Index.
Is Claude Sonnet 5.5 or Llama 3.1 Nemotron 51b Instruct better for coding?
Claude Sonnet 5.5 scores higher on coding benchmarks: 67.3 versus 35.6 in the Noometry coding category.
How many benchmarks do Claude Sonnet 5.5 and Llama 3.1 Nemotron 51b Instruct share?
12 benchmarks have published results for both models. Claude Sonnet 5.5 has 32 scored results on Noometry and Llama 3.1 Nemotron 51b Instruct has 12.