Model comparison
Claude Sonnet 5.5 vs Llama 3.1 Nemotron Ultra 253b v1
Claude Sonnet 5.5 is the stronger model overall, scoring 61.9 to 36.7 on the Noometry Index.
Last verified . 10 shared benchmarks.
NVIDIASummary
- They share 10 benchmarks with published results for both. Claude Sonnet 5.5 scores higher in 8 categories and Llama 3.1 Nemotron Ultra 253b v1 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 37.5.
- Llama 3.1 Nemotron Ultra 253b v1 has downloadable open weights; the other is API-only.
Side by side
| Claude Sonnet 5.5 | Llama 3.1 Nemotron Ultra 253b v1 | |
|---|---|---|
| Provider | Anthropic | NVIDIA |
| Noometry Index | 61.9 | 36.7 |
| Released | 2026-09-28 | — |
| Weights | Proprietary | Open |
| Context window | 1M | — |
| Max output | 128K | — |
| Input $ / M tokens | $2 | — |
| Output $ / M tokens | $10 | — |
| Results tracked | 32 | 11 |
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Category by category
Coding Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 67.3 (#6), Llama 3.1 Nemotron Ultra 253b v1: 38.4 (#177)
| Benchmark | Claude Sonnet 5.5 | Llama 3.1 Nemotron Ultra 253b v1 |
|---|---|---|
| LMArena Coding | 1513 | 1312 |
| FrontierCode | 52.1% | — |
| CursorBench | 55.5% | — |
| LMArena WebDev | 1774 | — |
| FrontierSWE | 61.9% | — |
| SciCode | 61% | — |
| ALE-Bench | 1,819 | — |
Agentic & Tool Use Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 45.0 (#16), Llama 3.1 Nemotron Ultra 253b v1: 15.7 (#149)
| Benchmark | Claude Sonnet 5.5 | Llama 3.1 Nemotron Ultra 253b v1 |
|---|---|---|
| APEX-Agents | 75.5% | — |
| Berkeley Function Calling Leaderboard | — | 10% |
Reasoning Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 54.0 (#28), Llama 3.1 Nemotron Ultra 253b v1: 26.3 (#134)
| Benchmark | Claude Sonnet 5.5 | Llama 3.1 Nemotron Ultra 253b v1 |
|---|---|---|
| LMArena Hard Prompts | 1495 | 1316 |
| 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 Ultra 253b v1: 37.5 (#152)
| Benchmark | Claude Sonnet 5.5 | Llama 3.1 Nemotron Ultra 253b v1 |
|---|---|---|
| LMArena Math | 1510 | 1360 |
| FrontierMath (Tiers 1-3) | 88.8% | — |
| FrontierMath Tier 4 | 80.5% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| ProofBench | 100% | — |
| FrontierMath Erdős | 2.9% | — |
Knowledge Not comparable
Claude Sonnet 5.5: 66.0 (#12), Llama 3.1 Nemotron Ultra 253b v1: —
| Benchmark | Claude Sonnet 5.5 | Llama 3.1 Nemotron Ultra 253b v1 |
|---|---|---|
| GPQA Diamond | 95.6% | — |
| SimpleQA Verified | 46.5% | — |
| LMArena Expert | 1540 | — |
Multimodal Not comparable
Claude Sonnet 5.5: 51.5 (#6), Llama 3.1 Nemotron Ultra 253b v1: —
| Benchmark | Claude Sonnet 5.5 | Llama 3.1 Nemotron Ultra 253b v1 |
|---|---|---|
| LMArena Vision | 1289 | — |
| Furniture Assembly | 75% | — |
Multilingual Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 55.3 (#30), Llama 3.1 Nemotron Ultra 253b v1: 43.1 (#187)
| Benchmark | Claude Sonnet 5.5 | Llama 3.1 Nemotron Ultra 253b v1 |
|---|---|---|
| LMArena Non-English | 1452 | 1282 |
| LMArena Russian | 1451 | 1284 |
| LMArena Chinese | 1522 | — |
Instruction Following Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 78.3 (#11), Llama 3.1 Nemotron Ultra 253b v1: 69.0 (#178)
| Benchmark | Claude Sonnet 5.5 | Llama 3.1 Nemotron Ultra 253b v1 |
|---|---|---|
| LMArena Instruction Following | 1495 | 1308 |
Long Context Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 45.9 (#28), Llama 3.1 Nemotron Ultra 253b v1: 39.5 (#177)
| Benchmark | Claude Sonnet 5.5 | Llama 3.1 Nemotron Ultra 253b v1 |
|---|---|---|
| LMArena Longer Query | 1498 | 1299 |
Writing & Preference Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 66.0 (#40), Llama 3.1 Nemotron Ultra 253b v1: 52.2 (#175)
| Benchmark | Claude Sonnet 5.5 | Llama 3.1 Nemotron Ultra 253b v1 |
|---|---|---|
| LMArena Text | 1471 | 1320 |
| LMArena Creative Writing | 1465 | 1314 |
| LMArena Multi-Turn | 1474 | 1317 |
Frequently asked questions
Is Claude Sonnet 5.5 better than Llama 3.1 Nemotron Ultra 253b v1?
Claude Sonnet 5.5 is the stronger model overall, scoring 61.9 to 36.7 on the Noometry Index.
Is Claude Sonnet 5.5 or Llama 3.1 Nemotron Ultra 253b v1 better for coding?
Claude Sonnet 5.5 scores higher on coding benchmarks: 67.3 versus 38.4 in the Noometry coding category.
How many benchmarks do Claude Sonnet 5.5 and Llama 3.1 Nemotron Ultra 253b v1 share?
10 benchmarks have published results for both models. Claude Sonnet 5.5 has 32 scored results on Noometry and Llama 3.1 Nemotron Ultra 253b v1 has 11.