Compare / head-to-head
Claude Fable 5.1vsNVIDIA Nemotron 3 Ultra 550B-A55B NVFP4
Claude Fable 5.1 leads 1 of 1 shared benchmark. Both offer a 1M-token context window.
Benchmarks from cited public sources; pricing from official pages; status from official provider feeds.
Shared benchmarks
1 – 0
Claude Fable 5.1 leads
Cheaper per token
—
list price, input + output
Larger context
Tie
both 1M tokens
Provider uptime (30d)
100% · 100%
Anthropic · NVIDIA
Claude Fable 5.1
Anthropic · released 2026-09-01
textvision
NVIDIA Nemotron 3 Ultra 550B-A55B NVFP4
NVIDIA · released 2026-06-04
text
- Context
- 1M
- Max out
- —
- Input /1M
- —
- Output /1M
- —
- Cached /1M
- —
- Scores
- 6 · 4 core
Quality
Benchmark matrix
1 shared · 7 only Claude Fable 5.1 · 5 only NVIDIA Nemotron 3 Ultra 550B-A55B NVFP4| Benchmark | Claude Fable 5.1 | NVIDIA Nemotron 3 Ultra 550B-A55B NVFP4 | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 1 | ||||
| Humanity's Last Exam (no tools) | 60.9% ↗ | 26.1% ↗ | +34.8 pt | Claude Fable 5.1 |
| Only Claude Fable 5.1 reports · 7 | ||||
| CursorBench 3.2.0 | 73.4% ↗ | not reported | — | — |
| FrontierMath Tier 4 v2 (Epoch AI run) | 87.8% ↗epoch | not reported | — | — |
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | 90.2% ↗epoch | not reported | — | — |
| GDPval-AA v2 | 1853 ↗ | not reported | — | — |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | 100% ↗epoch | not reported | — | — |
| SimpleQA Verified | 70.8% ↗epoch | not reported | — | — |
| Terminal-Bench Science 0.1 | 52.6% ↗ | not reported | — | — |
| Only NVIDIA Nemotron 3 Ultra 550B-A55B NVFP4 reports · 5 | ||||
| SWE-bench Verified | not reported | 69.7% ↗ | — | — |
| GPQA Diamond | not reported | 87.9% ↗ | — | — |
| LMArena Elo | not reported | 1444.7 ↗ | — | — |
| BrowseComp | not reported | 41.4% ↗ | — | — |
| Terminal-Bench 2.1 | not reported | 53.9% ↗ | — | — |
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 Claude Fable 5.1 minus NVIDIA Nemotron 3 Ultra 550B-A55B NVFP4 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 | Claude Fable 5.1 | NVIDIA Nemotron 3 Ultra 550B-A55B NVFP4 | Edge |
|---|---|---|---|
| Context window | 1M tokens | 1M tokens | Tie |
| Max output | 128K tokens | — | — |
| Input price / 1M | $10 ↗ | — | — |
| Output price / 1M | $50 ↗ | — | — |
| Cached input / 1M | $0.25 ↗ | — | — |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $60 | — | — |
| Modalities | text · vision | text | Claude Fable 5.1 |
| Released | 2026-09-01 | 2026-06-04 | — |
| Cited benchmark scores | 8 | 6 | — |
Reliability
Provider status
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Which one wins on your data?
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