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NVIDIA Nemotron 3 Ultra 550B-A55B NVFP4vsStep 3.5 Flash
Step 3.5 Flash leads 2 of 3 shared benchmarks. NVIDIA Nemotron 3 Ultra 550B-A55B NVFP4 has the larger context window (1M tokens).
Benchmarks from cited public sources; pricing from official pages; status from official provider feeds.
Shared benchmarks
1 – 2
Step 3.5 Flash leads
Cheaper per token
—
list price, input + output
Larger context
NVIDIA Nemotron 3 Ultra 550B-A55B NVFP4
1M tokens
Provider uptime (30d)
100% · —
NVIDIA · StepFun
NVIDIA Nemotron 3 Ultra 550B-A55B NVFP4
NVIDIA · released 2026-06-04
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- Context
- 1M
- Max out
- —
- Input /1M
- —
- Output /1M
- —
- Cached /1M
- —
- Scores
- 6 · 4 core
Step 3.5 Flash
StepFun · released 2026-02-12
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- Context
- 256K
- Max out
- —
- Input /1M
- —
- Output /1M
- —
- Cached /1M
- —
- Scores
- 18 · 5 core
Quality
Benchmark matrix
3 shared · 3 only NVIDIA Nemotron 3 Ultra 550B-A55B NVFP4 · 14 only Step 3.5 Flash| Benchmark | NVIDIA Nemotron 3 Ultra 550B-A55B NVFP4 | Step 3.5 Flash | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 3 | ||||
| SWE-bench Verified | 69.7% ↗ | 74.4% ↗ | -4.7 pt | Step 3.5 Flash |
| LMArena Elo | 1444.7 ↗ | 1403.7 ↗ | +41 | NVIDIA Nemotron 3 Ultra 550B-A55B NVFP4 |
| BrowseComp | 41.4% ↗ | 51.6% ↗ | -10.2 pt | Step 3.5 Flash |
| Only NVIDIA Nemotron 3 Ultra 550B-A55B NVFP4 reports · 3 | ||||
| GPQA Diamond | 87.9% ↗ | not reported | — | — |
| Humanity's Last Exam (no tools) | 26.1% ↗ | not reported | — | — |
| Terminal-Bench 2.1 | 53.9% ↗ | not reported | — | — |
| Only Step 3.5 Flash reports · 14 | ||||
| AIME 2025 | not reported | 97.3% ↗ | — | — |
| AIME 2026 | not reported | 96.7% ↗matharena | — | — |
| BrowseComp (with context manager) | not reported | 69% ↗ | — | — |
| BrowseComp-ZH | not reported | 66.9% ↗ | — | — |
| BrowseComp-ZH (with context manager) | not reported | 73.7% ↗ | — | — |
| GAIA (no file) | not reported | 84.5% ↗ | — | — |
| HMMT 2025 (Feb/Nov average) | not reported | 96.2% ↗ | — | — |
| IMOAnswerBench | not reported | 85.4% ↗ | — | — |
| LiveCodeBench v6 | not reported | 86.4% ↗ | — | — |
| ResearchRubrics | not reported | 65.3% ↗ | — | — |
| Tau2-Bench | not reported | 88.2% ↗ | — | — |
| Terminal-Bench 2.0 | not reported | 51% ↗ | — | — |
| xbench-DeepSearch 2025.05 | not reported | 83.7% ↗ | — | — |
| xbench-DeepSearch 2025.10 | not reported | 56.3% ↗ | — | — |
Scores tagged "epoch" or "matharena" are independent runs, used only where the lab has not published its own; ⚠ marks rows MathArena flags as released after the competition. Higher is better on every row. Δ is NVIDIA Nemotron 3 Ultra 550B-A55B NVFP4 minus Step 3.5 Flash in the benchmark's own unit. "Not reported" means the lab has not published that figure; it is not a zero. ↗ opens the source.
Specs & pricing
Side by side
Official pricing pages and model cards| Spec | NVIDIA Nemotron 3 Ultra 550B-A55B NVFP4 | Step 3.5 Flash | Edge |
|---|---|---|---|
| Context window | 1M tokens | 256K tokens | NVIDIA Nemotron 3 Ultra 550B-A55B NVFP4 |
| Max output | — | — | — |
| Input price / 1M | — | — | — |
| Output price / 1M | — | — | — |
| Cached input / 1M | — | — | — |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | — | — | — |
| Modalities | text | text | Tie |
| Released | 2026-06-04 | 2026-02-12 | — |
| Cited benchmark scores | 6 | 18 | — |
Reliability
Provider status
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Which one wins on your data?
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