Model comparison
GPT-5.5 Pro vs Nemotron 3 Ultra
Head-to-head evidence from 4 shared benchmark results across 3 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Verified leaderboard positions: GPT-5.5 Pro unranked; Nemotron 3 Ultra #24
BenchAlign evidence: GPT-5.5 Pro estimated; Nemotron 3 Ultra not scored. Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. GPT-5.5 Pro and Nemotron 3 Ultra share 4 comparable benchmark results. 2 of 8 categories are comparable. 3 results are unique to GPT-5.5 Pro; 35 to Nemotron 3 Ultra.
Updated July 16, 2026- Shared results
- 4
- GPT-5.5 Pro only
- 3
- Nemotron 3 Ultra only
- 35
- Comparable categories
- 2 / 8
Pick GPT-5.5 Pro if you want the stronger benchmark profile. Nemotron 3 Ultra only becomes the better choice if you want the cheaper token bill.
Confidence note. This is a partial-evidence comparison with 4 shared benchmark results across 3 evidence categories; 2 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.
Why this result
GPT-5.5 Pro is clearly ahead on the provisional aggregate, 75 to 60. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
GPT-5.5 Pro's sharpest advantage is in agentic, where it averages 90.1 against 51.3. The single biggest benchmark swing on the page is BrowseComp, 90.1% to 44.4%.
GPT-5.5 Pro is also the more expensive model on tokens at $30.00 input / $180.00 output per 1M tokens, versus $0.00 input / $0.00 output per 1M tokens for Nemotron 3 Ultra. That is roughly Infinityx on output cost alone.
Category breakdown
Exact category averages are shown below. Not measured means BenchLM does not have enough sourced public coverage for that model and category.
| Category | GPT-5.5 Pro | Δ | Nemotron 3 Ultra |
|---|---|---|---|
| Agentic | GPT-5.5 Pro90.1 | Margin← 38.8 | Nemotron 3 Ultra51.3 |
| Knowledge | GPT-5.5 Pro57.2 | Margin← 3.0 | Nemotron 3 Ultra54.2 |
| Coding | GPT-5.5 ProNot measured | MarginNo overlap | Nemotron 3 Ultra58.3 |
| Reasoning | GPT-5.5 ProNot measured | MarginNo overlap | Nemotron 3 Ultra61.9 |
| Math | GPT-5.5 Pro48.1 | MarginNo overlap | Nemotron 3 UltraNot measured |
| Multilingual | GPT-5.5 ProNot measured | MarginNo overlap | Nemotron 3 Ultra83.0 |
| Inst. Following | GPT-5.5 ProNot measured | MarginNo overlap | Nemotron 3 Ultra81.7 |
Decisive benchmark drivers
The largest measured benchmark gaps in this matchup, with exact reported values.
More
- Source ↗
BrowseComp
AgenticA 90.1%B 44.4%Winner: GPT-5.5 ProΔ 45.7BrowseComp: GPT-5.5 Pro scored 90.1%; Nemotron 3 Ultra scored 44.4%. GPT-5.5 Pro wins this benchmark. - Source ↗
HLE
KnowledgeA 57.2%B 26.7%Winner: GPT-5.5 ProΔ 30.5HLE: GPT-5.5 Pro scored 57.2%; Nemotron 3 Ultra scored 26.7%. GPT-5.5 Pro wins this benchmark.
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | GPT-5.5 Pro | Nemotron 3 Ultra | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | GPT-5.5 Pro$30 input / $180 output | Nemotron 3 Ultra$0 input / $0 output | Nemotron 3 Ultra has the lower combined listed price. |
| Generation speedtokens per second | GPT-5.5 ProNot available | Nemotron 3 UltraNot available | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | GPT-5.5 ProNot available | Nemotron 3 UltraNot available | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | GPT-5.5 Pro1M | Nemotron 3 Ultra1M | Listed context windows are equal. |
Benchmark Deep Dive
AgenticGPT-5.5 Pro wins12 benchmarks
| Benchmark | GPT-5.5 Pro | Nemotron 3 Ultra | Result |
|---|---|---|---|
| BrowseCompSource | 90.1% | 44.4% | GPT-5.5 Pro leads |
| Terminal-Bench 2.0Source | — | 56.4% | Not comparable |
| PinchBenchSource | — | 90.0% | Not comparable |
| τ³-bench resultsSource | — | 70.9% | Not comparable |
| GDPval-AASource | — | 33.2% | Not comparable |
| HLE w/ toolsSource | — | 37.4% | Not comparable |
| AA Agentic IndexSource | — | 27.4% | Not comparable |
| τ²-bench resultsSource | — | 83.3% | Not comparable |
| GDPval-AASource | — | 1164 | Not comparable |
| AA BriefcaseSource | — | 870 | Not comparable |
| AA EnterpriseOps-GymSource | — | 28.9% | Not comparable |
| AA Harvey LABSource | — | 3.3% | Not comparable |
Coding8 benchmarks
| Benchmark | GPT-5.5 Pro | Nemotron 3 Ultra | Result |
|---|---|---|---|
| SWE-bench VerifiedSource | — | 71.9% | Not comparable |
| SWE MultilingualSource | — | 67.7% | Not comparable |
| LiveCodeBench v6Source | — | 89.0% | Not comparable |
| SciCodeSource | — | 44.6% | Not comparable |
| Terminal-Bench 2.0Source | — | 56.4% | Not comparable |
| AA Coding IndexSource | — | 49.3% | Not comparable |
| Terminal-Bench HardSource | — | 36.4% | Not comparable |
| AA-SciCodeSource | — | 39.9% | Not comparable |
Reasoning3 benchmarks
KnowledgeGPT-5.5 Pro wins12 benchmarks
| Benchmark | GPT-5.5 Pro | Nemotron 3 Ultra | Result |
|---|---|---|---|
| HLESource | 57.2% | 26.7% | GPT-5.5 Pro leads |
| HLE w/o toolsSource | 43.1% | 26.7% | GPT-5.5 Pro leads |
| GPQASource | — | 87% | Not comparable |
| GPQA-DSource | — | 87.0% | Not comparable |
| MMLU-ProSource | — | 86.8% | Not comparable |
| AA-Omniscience AccuracySource | — | 21.6% | Not comparable |
| Artificial Analysis Intelligence IndexSource | — | 37.8% | Not comparable |
| AA-GPQA DiamondSource | — | 86.7% | Not comparable |
| AA-HLESource | — | 26.6% | Not comparable |
| AA-Omniscience IndexSource | — | -0.8% | Not comparable |
| AA-Omniscience Hallucination RateSource | — | 28.5% | Not comparable |
| AA Openness IndexSource | — | 83.3% | Not comparable |
Math3 benchmarks
Multilingual1 benchmarks
| Benchmark | GPT-5.5 Pro | Nemotron 3 Ultra | Result |
|---|---|---|---|
| MMLU-ProXSource | — | 83% | Not comparable |
Multimodal1 benchmarks
| Benchmark | GPT-5.5 Pro | Nemotron 3 Ultra | Result |
|---|---|---|---|
| Design Arena WebsiteSource | — | 1132 | Not comparable |
Frequently Asked Questions (3)
Which is better, GPT-5.5 Pro or Nemotron 3 Ultra?
GPT-5.5 Pro is ahead on BenchLM's provisional leaderboard, 75 to 60. The biggest single separator in this matchup is BrowseComp, where the scores are 90.1% and 44.4%.
Which is better for knowledge tasks, GPT-5.5 Pro or Nemotron 3 Ultra?
GPT-5.5 Pro has the edge for knowledge tasks in this comparison, averaging 57.2 versus 54.2. Inside this category, HLE is the benchmark that creates the most daylight between them.
Which is better for agentic tasks, GPT-5.5 Pro or Nemotron 3 Ultra?
GPT-5.5 Pro has the edge for agentic tasks in this comparison, averaging 90.1 versus 51.3. Inside this category, BrowseComp is the benchmark that creates the most daylight between them.
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