Model comparison
GPT-6 Sol vs Nemotron 3.5 Lightning
GPT-6 Sol is the stronger model overall, scoring 49.2 to 39.3 on the Noometry Index. Nemotron 3.5 Lightning costs 47× less per token, which makes it the better buy when GPT-6 Sol's lead doesn't matter for your workload.
Last verified . 14 shared benchmarks.
NVIDIASummary
- They share 14 benchmarks with published results for both. GPT-6 Sol 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 GPT-6 Sol leads 72.3 to 48.5.
- Nemotron 3.5 Lightning is cheaper at $0.06 / $0.16 per million input/output tokens, against $2 / $10 for GPT-6 Sol.
- GPT-6 Sol accepts more context: 1.05M tokens versus 262K.
- Nemotron 3.5 Lightning has downloadable open weights; the other is API-only.
Side by side
| GPT-6 Sol | Nemotron 3.5 Lightning | |
|---|---|---|
| Provider | OpenAI | NVIDIA |
| Noometry Index | 49.2 | 39.3 |
| Released | 2026-09-22 | 2026-08-11 |
| Weights | Proprietary | Open |
| Context window | 1.05M | 262K |
| Max output | 128K | 262K |
| Input $ / M tokens | $2 | $0.06 |
| Output $ / M tokens | $10 | $0.16 |
| Results tracked | 22 | 18 |
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Category by category
Coding GPT-6 Sol leads
GPT-6 Sol: 59.6 (#11), Nemotron 3.5 Lightning: 39.6 (#143)
| Benchmark | GPT-6 Sol | Nemotron 3.5 Lightning |
|---|---|---|
| LMArena Coding | 1453 | 1370 |
| DeepSWE | 68.8% | — |
| FrontierCode | 49.3% | — |
| LMArena WebDev | 1692 | — |
Agentic & Tool Use Not comparable
GPT-6 Sol: 33.5 (#49), Nemotron 3.5 Lightning: —
| Benchmark | GPT-6 Sol | Nemotron 3.5 Lightning |
|---|---|---|
| GDP.pdf | 28% | — |
Reasoning GPT-6 Sol leads
GPT-6 Sol: 49.3 (#34), Nemotron 3.5 Lightning: 25.7 (#128)
| Benchmark | GPT-6 Sol | Nemotron 3.5 Lightning |
|---|---|---|
| LMArena Hard Prompts | 1420 | 1335 |
| NYT Connections (extended) | 90.1% | — |
| EBR-Bench | 53.3% | — |
Math GPT-6 Sol leads
GPT-6 Sol: 35.8 (#135), Nemotron 3.5 Lightning: 34.7 (#156)
| Benchmark | GPT-6 Sol | Nemotron 3.5 Lightning |
|---|---|---|
| LMArena Math | 1404 | 1355 |
Knowledge GPT-6 Sol leads
GPT-6 Sol: 43.0 (#87), Nemotron 3.5 Lightning: 36.9 (#154)
| Benchmark | GPT-6 Sol | Nemotron 3.5 Lightning |
|---|---|---|
| LMArena Expert | 1449 | 1354 |
| Vectara Hallucination Rate | 6.5% | — |
Multimodal Not comparable
GPT-6 Sol: 47.6 (#9), Nemotron 3.5 Lightning: —
| Benchmark | GPT-6 Sol | Nemotron 3.5 Lightning |
|---|---|---|
| Furniture Assembly | 58.3% | — |
Multilingual GPT-6 Sol leads
GPT-6 Sol: 51.0 (#113), Nemotron 3.5 Lightning: 44.0 (#175)
| Benchmark | GPT-6 Sol | Nemotron 3.5 Lightning |
|---|---|---|
| LMArena Non-English | 1389 | 1292 |
| LMArena Chinese | 1416 | 1356 |
| LMArena Russian | 1407 | 1257 |
| LMArena Spanish | 1377 | 1321 |
| LMArena French | — | 1369 |
| LMArena German | — | 1280 |
| LMArena Japanese | — | 1213 |
| LMArena Korean | — | 1233 |
Instruction Following GPT-6 Sol leads
GPT-6 Sol: 74.4 (#97), Nemotron 3.5 Lightning: 69.8 (#166)
| Benchmark | GPT-6 Sol | Nemotron 3.5 Lightning |
|---|---|---|
| LMArena Instruction Following | 1406 | 1317 |
Long Context GPT-6 Sol leads
GPT-6 Sol: 43.2 (#100), Nemotron 3.5 Lightning: 39.9 (#160)
| Benchmark | GPT-6 Sol | Nemotron 3.5 Lightning |
|---|---|---|
| LMArena Longer Query | 1415 | 1312 |
Writing & Preference GPT-6 Sol leads
GPT-6 Sol: 72.3 (#15), Nemotron 3.5 Lightning: 48.5 (#198)
| Benchmark | GPT-6 Sol | Nemotron 3.5 Lightning |
|---|---|---|
| LMArena Text | 1396 | 1324 |
| LMArena Creative Writing | 1392 | 1254 |
| EQ-Bench Creative Writing | 2125 | 1280 |
| LMArena Multi-Turn | 1405 | 1327 |
Frequently asked questions
Is GPT-6 Sol better than Nemotron 3.5 Lightning?
GPT-6 Sol is the stronger model overall, scoring 49.2 to 39.3 on the Noometry Index. Nemotron 3.5 Lightning costs 47× less per token, which makes it the better buy when GPT-6 Sol's lead doesn't matter for your workload.
Which is cheaper, GPT-6 Sol or Nemotron 3.5 Lightning?
Nemotron 3.5 Lightning is cheaper. It lists at $0.06 per million input tokens and $0.16 per million output tokens; GPT-6 Sol lists at $2 and $10.
Is GPT-6 Sol or Nemotron 3.5 Lightning better for coding?
GPT-6 Sol scores higher on coding benchmarks: 59.6 versus 39.6 in the Noometry coding category.
Which has the bigger context window?
GPT-6 Sol does, with 1.05M tokens against 262K.
How many benchmarks do GPT-6 Sol and Nemotron 3.5 Lightning share?
14 benchmarks have published results for both models. GPT-6 Sol has 22 scored results on Noometry and Nemotron 3.5 Lightning has 18.