Model comparison
Claude Sonnet 4.6 vs Nemotron 3.5 Lightning
Claude Sonnet 4.6 is the stronger model overall, scoring 50.3 to 40.0 on the Noometry Index. Nemotron 3.5 Lightning costs 69× less per token, which makes it the better buy when Claude Sonnet 4.6's lead doesn't matter for your workload.
Last verified . 18 shared benchmarks.
NVIDIASummary
- They share 18 benchmarks with published results for both. Claude Sonnet 4.6 scores higher in 8 categories and Nemotron 3.5 Lightning in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where Claude Sonnet 4.6 leads 70.2 to 48.5.
- Nemotron 3.5 Lightning is cheaper at $0.05 / $0.20 per million input/output tokens, against $3 / $15 for Claude Sonnet 4.6.
- Claude Sonnet 4.6 accepts more context: 1M tokens versus 262K.
- Nemotron 3.5 Lightning has downloadable open weights; the other is API-only.
Side by side
| Claude Sonnet 4.6 | Nemotron 3.5 Lightning | |
|---|---|---|
| Provider | Anthropic | NVIDIA |
| Noometry Index | 50.3 | 40.0 |
| Released | 2026-02-17 | 2026-08-11 |
| Weights | Proprietary | Open |
| Context window | 1M | 262K |
| Max output | 128K | 262K |
| Input $ / M tokens | $3 | $0.05 |
| Output $ / M tokens | $15 | $0.20 |
| Results tracked | 57 | 18 |
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Category by category
Coding Claude Sonnet 4.6 leads
Claude Sonnet 4.6: 46.3 (#67), Nemotron 3.5 Lightning: 40.4 (#141)
| Benchmark | Claude Sonnet 4.6 | Nemotron 3.5 Lightning |
|---|---|---|
| LMArena Coding | 1504 | 1375 |
| SWE-bench Verified | 75.2% | — |
| DeepSWE | 29.9% | — |
| FrontierCode | 24.3% | — |
| LMArena WebDev | 1522 | — |
| SciCode | 46.8% | — |
| WeirdML | 66.1% | — |
| ALE-Bench | 1,327 | — |
Agentic & Tool Use Not comparable
Claude Sonnet 4.6: 39.1 (#28), Nemotron 3.5 Lightning: —
| Benchmark | Claude Sonnet 4.6 | Nemotron 3.5 Lightning |
|---|---|---|
| Terminal-Bench | 53.4% | — |
| APEX-Agents | 43% | — |
| OSWorld 2.0 | 9.3% | — |
| DeepResearch Bench | 54.9% | — |
| OSWorld | 72.1% | — |
| ExploitBench | 23.6% | — |
| GBAEval | 48.8% | — |
| GDP.pdf | 18% | — |
| LMArena Search | 1221 | — |
| Vending-Bench 2 | 7,204 | — |
Reasoning Claude Sonnet 4.6 leads
Claude Sonnet 4.6: 46.1 (#45), Nemotron 3.5 Lightning: 26.8 (#127)
| Benchmark | Claude Sonnet 4.6 | Nemotron 3.5 Lightning |
|---|---|---|
| LMArena Hard Prompts | 1484 | 1337 |
| ARC-AGI-2 | 60.4% | — |
| NYT Connections (extended) | 80.9% | — |
| ARC-AGI-1 | 86.5% | — |
| CritPt | 3.1% | — |
| Chess Puzzles | 13% | — |
| Thematic Generalization | 76.3% | — |
| Mystery Game Puzzles | 16% | — |
| DTBench | 89.9% | — |
| LMCA | 46.5% | — |
| Epoch Capabilities Index | 152.24 | — |
| ForecastBench | 62 | — |
Math Claude Sonnet 4.6 leads
Claude Sonnet 4.6: 52.9 (#49), Nemotron 3.5 Lightning: 37.5 (#155)
| Benchmark | Claude Sonnet 4.6 | Nemotron 3.5 Lightning |
|---|---|---|
| LMArena Math | 1462 | 1359 |
| OTIS Mock AIME 2024-2025 | 85.8% | — |
| ProofBench | 45% | — |
| FrontierMath (Feb 2025 set) | 32.4% | — |
| FrontierMath Tier 4 (v1) | 8.3% | — |
Knowledge Claude Sonnet 4.6 leads
Claude Sonnet 4.6: 51.7 (#65), Nemotron 3.5 Lightning: 37.5 (#154)
| Benchmark | Claude Sonnet 4.6 | Nemotron 3.5 Lightning |
|---|---|---|
| LMArena Expert | 1500 | 1356 |
| GPQA Diamond | 87.4% | — |
| SimpleQA Verified | 35.5% | — |
| Vectara Hallucination Rate | 10.6% | — |
Multimodal Not comparable
Claude Sonnet 4.6: 38.0 (#68), Nemotron 3.5 Lightning: —
| Benchmark | Claude Sonnet 4.6 | Nemotron 3.5 Lightning |
|---|---|---|
| LMArena Vision | 1283 | — |
| Blueprint-Bench 2 | 6.7% | — |
| LMArena Document | 1482 | — |
Multilingual Claude Sonnet 4.6 leads
Claude Sonnet 4.6: 54.4 (#41), Nemotron 3.5 Lightning: 44.0 (#180)
| Benchmark | Claude Sonnet 4.6 | Nemotron 3.5 Lightning |
|---|---|---|
| LMArena Non-English | 1440 | 1295 |
| LMArena Chinese | 1491 | 1359 |
| LMArena French | 1465 | 1366 |
| LMArena German | 1428 | 1282 |
| LMArena Japanese | 1420 | 1206 |
| LMArena Korean | 1411 | 1238 |
| LMArena Russian | 1440 | 1253 |
| LMArena Spanish | 1464 | 1345 |
Instruction Following Claude Sonnet 4.6 leads
Claude Sonnet 4.6: 77.4 (#25), Nemotron 3.5 Lightning: 69.6 (#170)
| Benchmark | Claude Sonnet 4.6 | Nemotron 3.5 Lightning |
|---|---|---|
| LMArena Instruction Following | 1475 | 1318 |
Long Context Claude Sonnet 4.6 leads
Claude Sonnet 4.6: 45.3 (#44), Nemotron 3.5 Lightning: 39.9 (#165)
| Benchmark | Claude Sonnet 4.6 | Nemotron 3.5 Lightning |
|---|---|---|
| LMArena Longer Query | 1479 | 1314 |
Writing & Preference Claude Sonnet 4.6 leads
Claude Sonnet 4.6: 70.2 (#22), Nemotron 3.5 Lightning: 48.5 (#201)
| Benchmark | Claude Sonnet 4.6 | Nemotron 3.5 Lightning |
|---|---|---|
| LMArena Text | 1458 | 1327 |
| LMArena Creative Writing | 1435 | 1254 |
| EQ-Bench Creative Writing | 1810 | 1280 |
| LMArena Multi-Turn | 1464 | 1328 |
| EQ-Bench 4 | 1207 | — |
Frequently asked questions
Is Claude Sonnet 4.6 better than Nemotron 3.5 Lightning?
Claude Sonnet 4.6 is the stronger model overall, scoring 50.3 to 40.0 on the Noometry Index. Nemotron 3.5 Lightning costs 69× less per token, which makes it the better buy when Claude Sonnet 4.6's lead doesn't matter for your workload.
Which is cheaper, Claude Sonnet 4.6 or Nemotron 3.5 Lightning?
Nemotron 3.5 Lightning is cheaper. It lists at $0.05 per million input tokens and $0.20 per million output tokens; Claude Sonnet 4.6 lists at $3 and $15.
Is Claude Sonnet 4.6 or Nemotron 3.5 Lightning better for coding?
Claude Sonnet 4.6 scores higher on coding benchmarks: 46.3 versus 40.4 in the Noometry coding category.
Which has the bigger context window?
Claude Sonnet 4.6 does, with 1M tokens against 262K.
How many benchmarks do Claude Sonnet 4.6 and Nemotron 3.5 Lightning share?
18 benchmarks have published results for both models. Claude Sonnet 4.6 has 57 scored results on Noometry and Nemotron 3.5 Lightning has 18.