Model comparison
GPT-5.5 Pro vs Nemotron 3 Ultra
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 42.5 on the Noometry Index. Nemotron 3 Ultra costs 73× less per token, which makes it the better buy when GPT-5.5 Pro's lead doesn't matter for your workload.
Last verified . 7 shared benchmarks.
NVIDIASummary
- They share 7 benchmarks with published results for both. GPT-5.5 Pro scores higher in 3 categories and Nemotron 3 Ultra in 0 categories; 3 gaps are clear of the uncertainty.
- The widest gap is in math, where GPT-5.5 Pro leads 84.0 to 35.3.
- The biggest single-benchmark swing is Chess Puzzles: 64% for GPT-5.5 Pro and 12% for Nemotron 3 Ultra.
- Nemotron 3 Ultra is cheaper at $0.50 / $2.20 per million input/output tokens, against $30 / $180 for GPT-5.5 Pro.
- GPT-5.5 Pro accepts more context: 1.05M tokens versus 262K.
- Nemotron 3 Ultra has downloadable open weights; the other is API-only.
Side by side
| GPT-5.5 Pro | Nemotron 3 Ultra | |
|---|---|---|
| Provider | OpenAI | NVIDIA |
| Noometry Index | 64.3 | 42.5 |
| Released | 2026-04-23 | 2026-06-04 |
| Weights | Proprietary | Open |
| Context window | 1.05M | 262K |
| Max output | 128K | 128K |
| Input $ / M tokens | $30 | $0.50 |
| Output $ / M tokens | $180 | $2.20 |
| Results tracked | 14 | 30 |
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Category by category
Coding Not comparable
GPT-5.5 Pro: —, Nemotron 3 Ultra: 38.1 (#182)
| Benchmark | GPT-5.5 Pro | Nemotron 3 Ultra |
|---|---|---|
| FrontierCode | — | 13.6% |
| SciCode | — | 40.3% |
| WeirdML | — | 43.5% |
| LMArena Coding | — | 1468 |
Agentic & Tool Use Not comparable
GPT-5.5 Pro: —, Nemotron 3 Ultra: 23.4 (#126)
| Benchmark | GPT-5.5 Pro | Nemotron 3 Ultra |
|---|---|---|
| APEX-Agents | — | 22.7% |
Reasoning GPT-5.5 Pro leads
GPT-5.5 Pro: 73.3 (#10), Nemotron 3 Ultra: 31.0 (#82)
| Benchmark | GPT-5.5 Pro | Nemotron 3 Ultra |
|---|---|---|
| CritPt | 30.6% | 3.1% |
| Chess Puzzles | 64% | 12% |
| DTBench | 96% | 90.1% |
| LMCA | 53.9% | 36.9% |
| Epoch Capabilities Index | 162.07 | 146.17 |
| ARC-AGI-2 | 84.6% | — |
| SimpleBench | 76.9% | — |
| ARC-AGI-1 | 96.5% | — |
| LMArena Hard Prompts | — | 1452 |
| Mystery Game Puzzles | — | 20% |
Math GPT-5.5 Pro leads
GPT-5.5 Pro: 84.0 (#10), Nemotron 3 Ultra: 35.3 (#187)
| Benchmark | GPT-5.5 Pro | Nemotron 3 Ultra |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 100% | 86.7% |
| FrontierMath (Tiers 1-3) | 87.7% | — |
| FrontierMath Tier 4 | 78% | — |
| ProofBench | — | 2% |
| LMArena Math | — | 1457 |
| FrontierMath (Feb 2025 set) | 52.4% | — |
| FrontierMath Tier 4 (v1) | 39.6% | — |
Knowledge GPT-5.5 Pro leads
GPT-5.5 Pro: 64.1 (#19), Nemotron 3 Ultra: 52.5 (#61)
| Benchmark | GPT-5.5 Pro | Nemotron 3 Ultra |
|---|---|---|
| GPQA Diamond | 93.9% | 85.4% |
| LMArena Expert | — | 1472 |
Multilingual Not comparable
GPT-5.5 Pro: —, Nemotron 3 Ultra: 53.5 (#64)
| Benchmark | GPT-5.5 Pro | Nemotron 3 Ultra |
|---|---|---|
| LMArena Non-English | — | 1427 |
| LMArena Chinese | — | 1497 |
| LMArena French | — | 1472 |
| LMArena German | — | 1471 |
| LMArena Korean | — | 1386 |
| LMArena Russian | — | 1417 |
| LMArena Spanish | — | 1454 |
Instruction Following Not comparable
GPT-5.5 Pro: —, Nemotron 3 Ultra: 74.7 (#88)
| Benchmark | GPT-5.5 Pro | Nemotron 3 Ultra |
|---|---|---|
| LMArena Instruction Following | — | 1418 |
Long Context Not comparable
GPT-5.5 Pro: —, Nemotron 3 Ultra: 43.9 (#81)
| Benchmark | GPT-5.5 Pro | Nemotron 3 Ultra |
|---|---|---|
| LMArena Longer Query | — | 1437 |
Writing & Preference Not comparable
GPT-5.5 Pro: —, Nemotron 3 Ultra: 66.3 (#36)
| Benchmark | GPT-5.5 Pro | Nemotron 3 Ultra |
|---|---|---|
| LMArena Text | — | 1445 |
| LMArena Creative Writing | — | 1398 |
| EQ-Bench Creative Writing | — | 1692 |
| LMArena Multi-Turn | — | 1411 |
Frequently asked questions
Is GPT-5.5 Pro better than Nemotron 3 Ultra?
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 42.5 on the Noometry Index. Nemotron 3 Ultra costs 73× less per token, which makes it the better buy when GPT-5.5 Pro's lead doesn't matter for your workload.
Which is cheaper, GPT-5.5 Pro or Nemotron 3 Ultra?
Nemotron 3 Ultra is cheaper. It lists at $0.50 per million input tokens and $2.20 per million output tokens; GPT-5.5 Pro lists at $30 and $180.
Which has the bigger context window?
GPT-5.5 Pro does, with 1.05M tokens against 262K.
How many benchmarks do GPT-5.5 Pro and Nemotron 3 Ultra share?
7 benchmarks have published results for both models. GPT-5.5 Pro has 14 scored results on Noometry and Nemotron 3 Ultra has 30.