Model comparison
GPT-5.5 vs Nemotron 3 Ultra
Head-to-head evidence from 27 shared benchmark results across 6 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Verified leaderboard positions: GPT-5.5 #3; Nemotron 3 Ultra #24
BenchAlign evidence: GPT-5.5 supported; Nemotron 3 Ultra not scored. Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. GPT-5.5 and Nemotron 3 Ultra share 27 comparable benchmark results. 4 of 8 categories are comparable. 30 results are unique to GPT-5.5; 12 to Nemotron 3 Ultra.
Updated July 16, 2026- Shared results
- 27
- GPT-5.5 only
- 30
- Nemotron 3 Ultra only
- 12
- Comparable categories
- 4 / 8
Pick GPT-5.5 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 27 shared benchmark results across 6 evidence categories; 4 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 is clearly ahead on the provisional aggregate, 78 to 60. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
GPT-5.5's sharpest advantage is in agentic, where it averages 81.6 against 51.3. The single biggest benchmark swing on the page is BrowseComp, 84.4% to 44.4%.
GPT-5.5 is also the more expensive model on tokens at $5.00 input / $30.00 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 | Δ | Nemotron 3 Ultra |
|---|---|---|---|
| Agentic | GPT-5.581.6 | Margin← 30.3 | Nemotron 3 Ultra51.3 |
| Reasoning | GPT-5.585.0 | Margin← 23.1 | Nemotron 3 Ultra61.9 |
| Knowledge | GPT-5.557.8 | Margin← 3.6 | Nemotron 3 Ultra54.2 |
| Coding | GPT-5.558.6 | Margin← 0.3 | Nemotron 3 Ultra58.3 |
| Math | GPT-5.547.6 | MarginNo overlap | Nemotron 3 UltraNot measured |
| Multilingual | GPT-5.5Not measured | MarginNo overlap | Nemotron 3 Ultra83.0 |
| Multimodal | GPT-5.570.4 | MarginNo overlap | Nemotron 3 UltraNot measured |
| Inst. Following | GPT-5.5Not 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 84.4%B 44.4%Winner: GPT-5.5Δ 40BrowseComp: GPT-5.5 scored 84.4%; Nemotron 3 Ultra scored 44.4%. GPT-5.5 wins this benchmark. - Source ↗
Terminal-Bench 2.0
AgenticA 82%B 56.4%Winner: GPT-5.5Δ 25.6Terminal-Bench 2.0: GPT-5.5 scored 82%; Nemotron 3 Ultra scored 56.4%. GPT-5.5 wins this benchmark. - Source ↗
HLE
KnowledgeA 52.2%B 26.7%Winner: GPT-5.5Δ 25.5HLE: GPT-5.5 scored 52.2%; Nemotron 3 Ultra scored 26.7%. GPT-5.5 wins this benchmark. - Source ↗
GPQA
KnowledgeA 93.6%B 87%Winner: GPT-5.5Δ 6.6GPQA: GPT-5.5 scored 93.6%; Nemotron 3 Ultra scored 87%. GPT-5.5 wins this benchmark.
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | GPT-5.5 | Nemotron 3 Ultra | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | GPT-5.5$5 input / $30 output | Nemotron 3 Ultra$0 input / $0 output | Nemotron 3 Ultra has the lower combined listed price. |
| Generation speedtokens per second | GPT-5.5Not available | Nemotron 3 UltraNot available | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | GPT-5.5Not available | Nemotron 3 UltraNot available | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | GPT-5.51M | Nemotron 3 Ultra1M | Listed context windows are equal. |
Benchmark Deep Dive
AgenticGPT-5.5 wins25 benchmarks
| Benchmark | GPT-5.5 | Nemotron 3 Ultra | Result |
|---|---|---|---|
| Terminal-Bench 2.0Source | 82% | 56.4% | GPT-5.5 leads |
| CyberGymSource | 81.8% | — | Not comparable |
| BrowseCompSource | 84.4% | 44.4% | GPT-5.5 leads |
| OSWorld-VerifiedSource | 78.7% | — | Not comparable |
| MCP AtlasSource | 75.3% | — | Not comparable |
| ToolathlonSource | 55.6% | — | Not comparable |
| τ²-bench resultsSource | 93.9% | 83.3% | GPT-5.5 leads |
| AA Agentic IndexSource | 44.9% | 27.4% | GPT-5.5 leads |
| APEX-Agents-AASource | 37.7% | — | Not comparable |
| GDPval-AASource | 49.7% | 33.2% | GPT-5.5 leads |
| GDPval-AASource | 1493 | 1164 | GPT-5.5 leads |
| Gert LabsSource | 72.93% | — | Not comparable |
| ResearchClawBenchSource | 17.0% | — | Not comparable |
| OSWorld 2.0Source | 13.0% | — | Not comparable |
| JobBenchSource | 42.7% | — | Not comparable |
| ExploitGymSource | 13.4% | — | Not comparable |
| AA BriefcaseSource | 1154 | 870 | GPT-5.5 leads |
| AA AutomationBenchSource | 42.1% | — | Not comparable |
| AA EnterpriseOps-GymSource | 46.6% | 28.9% | GPT-5.5 leads |
| AA Harvey LABSource | 4.2% | 3.3% | GPT-5.5 leads |
| AA ITBenchSource | 45.8% | — | Not comparable |
| AA Tau3 BankingSource | 31.3% | — | Not comparable |
| PinchBenchSource | — | 90.0% | Not comparable |
| τ³-bench resultsSource | — | 70.9% | Not comparable |
| HLE w/ toolsSource | — | 37.4% | Not comparable |
CodingGPT-5.5 wins15 benchmarks
| Benchmark | GPT-5.5 | Nemotron 3 Ultra | Result |
|---|---|---|---|
| SWE-bench ProSource | 58.6% | — | Not comparable |
| Terminal-Bench 2.0Source | 82.0% | 56.4% | GPT-5.5 leads |
| Vibe Code BenchSource | 69.85% | — | Not comparable |
| React Native EvalsSource | 84.7% | — | Not comparable |
| cursorBench31Source | 59.2% | — | Not comparable |
| cursorBench32Source | 58.4% | — | Not comparable |
| AA Coding IndexSource | 74.9% | 49.3% | GPT-5.5 leads |
| Terminal-Bench HardSource | 60.6% | 36.4% | GPT-5.5 leads |
| AA-SciCodeSource | 56.1% | 39.9% | GPT-5.5 leads |
| FrontierCodeSource | 43.0% | — | Not comparable |
| AA Terminal-Bench 2.1Source | 84.3% | — | Not comparable |
| SWE-bench VerifiedSource | — | 71.9% | Not comparable |
| SWE MultilingualSource | — | 67.7% | Not comparable |
| LiveCodeBench v6Source | — | 89.0% | Not comparable |
| SciCodeSource | — | 44.6% | Not comparable |
ReasoningGPT-5.5 wins6 benchmarks
KnowledgeGPT-5.5 wins12 benchmarks
| Benchmark | GPT-5.5 | Nemotron 3 Ultra | Result |
|---|---|---|---|
| GPQASource | 93.6% | 87% | GPT-5.5 leads |
| GPQA-DSource | 93.6% | 87.0% | GPT-5.5 leads |
| HLESource | 52.2% | 26.7% | GPT-5.5 leads |
| HLE w/o toolsSource | 41.4% | 26.7% | GPT-5.5 leads |
| Artificial Analysis Intelligence IndexSource | 54.8% | 37.8% | GPT-5.5 leads |
| AA-GPQA DiamondSource | 93.5% | 86.7% | GPT-5.5 leads |
| AA-HLESource | 44.3% | 26.6% | GPT-5.5 leads |
| AA-Omniscience IndexSource | 20.1% | -0.8% | GPT-5.5 leads |
| AA-Omniscience AccuracySource | 56.9% | 21.6% | GPT-5.5 leads |
| AA-Omniscience Hallucination RateSource | 85.5% | 28.5% | Nemotron 3 Ultra leads |
| MMLU-ProSource | — | 86.8% | Not comparable |
| AA Openness IndexSource | — | 83.3% | Not comparable |
Math3 benchmarks
Multilingual1 benchmarks
| Benchmark | GPT-5.5 | Nemotron 3 Ultra | Result |
|---|---|---|---|
| MMLU-ProXSource | — | 83% | Not comparable |
Multimodal5 benchmarks
Frequently Asked Questions (5)
Which is better, GPT-5.5 or Nemotron 3 Ultra?
GPT-5.5 is ahead on BenchLM's provisional leaderboard, 78 to 60. The biggest single separator in this matchup is BrowseComp, where the scores are 84.4% and 44.4%.
Which is better for knowledge tasks, GPT-5.5 or Nemotron 3 Ultra?
GPT-5.5 has the edge for knowledge tasks in this comparison, averaging 57.8 versus 54.2. Inside this category, AA-Omniscience Hallucination Rate is the benchmark that creates the most daylight between them.
Which is better for coding, GPT-5.5 or Nemotron 3 Ultra?
GPT-5.5 has the edge for coding in this comparison, averaging 58.6 versus 58.3. Inside this category, AA Coding Index is the benchmark that creates the most daylight between them.
Which is better for reasoning, GPT-5.5 or Nemotron 3 Ultra?
GPT-5.5 has the edge for reasoning in this comparison, averaging 85 versus 61.9. Inside this category, CritPt is the benchmark that creates the most daylight between them.
Which is better for agentic tasks, GPT-5.5 or Nemotron 3 Ultra?
GPT-5.5 has the edge for agentic tasks in this comparison, averaging 81.6 versus 51.3. Inside this category, GDPval-AA is the benchmark that creates the most daylight between them.
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