NVIDIA Nemotron 3 Ultra 550B A55B BF16 vs Grok 4.3
Model Markets Rankings
Intelligence, Cost, and Efficiency
| Ranking | NVIDIA-Nemotron-3-Ultra-550B-A55B-BF16 | Grok 4.3 |
|---|---|---|
| CostLower is better · Published-token output estimate | UnrankedNot in the 36-model eligible cohort | #6 of 36$0.028 per LiveBench case |
Ranks come from the current complete eligible cohorts. Green highlights appear only when both models are ranked in the same metric. Missing required inputs remain unranked, and the three dimensions are not collapsed into an overall winner.
Benchmark Performance
Available Benchmarks
Technical Differences
Side-by-Side Facts
| Field | NVIDIA-Nemotron-3-Ultra-550B-A55B-BF16 | Grok 4.3 |
|---|---|---|
| Developer | NVIDIA | xAI |
| Family | Nvidia Nemotron 3 Ultra 550b A55b Bf16 | Grok 4 |
| Model | NVIDIA-Nemotron-3-Ultra-550B-A55B-BF16 | Grok 4.3 |
| Version | NVIDIA-Nemotron-3-Ultra-550B-A55B-BF16 | Grok 4.3 |
| Lifecycle | active | active |
| Released | 2026-06-04 | 2026-06-17 |
| Knowledge cutoff | Unknown | Unknown |
| Input modalities | Text | Text, Image |
| Output modalities | Text | Text |
| Context window | 262K | 1,000K |
| Total parameters | 560.5B | Unknown |
| Active parameters | 55B | Unknown |
| License | other | Unknown |
| Open weights | Yes | No |
| API available | Yes | Yes |
| Self-hostable | Yes | No |
| Provider access | Fireworks Ai (Standard), Hugging Face (Standard), Openrouter (Standard) | Xai (Standard) |
| Capabilities | chat, generation, reasoning, tools | chat, generation, reasoning, structured_outputs, tools |
14 comparable fields · 11 material differences · Pair passes the primary-source comparison gate
NVIDIA Nemotron 3 Ultra 550B A55B BF16 Capabilities
Grok 4.3 Capabilities
Internal Comparison Graph
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Primary Evidence
Sources and Freshness
Questions
NVIDIA Nemotron 3 Ultra 550B A55B BF16 vs Grok 4.3 FAQs
Is NVIDIA Nemotron 3 Ultra 550B A55B BF16 or Grok 4.3 better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both NVIDIA Nemotron 3 Ultra 550B A55B BF16 and Grok 4.3, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, NVIDIA Nemotron 3 Ultra 550B A55B BF16 or Grok 4.3?+
NVIDIA Nemotron 3 Ultra 550B A55B BF16 is $0.50 and Grok 4.3 is $1.25 per million tokens, so NVIDIA Nemotron 3 Ultra 550B A55B BF16 is cheaper on this metric. NVIDIA Nemotron 3 Ultra 550B A55B BF16 is $2.20 and Grok 4.3 is $2.50 per million tokens, so NVIDIA Nemotron 3 Ultra 550B A55B BF16 is cheaper on this metric.
Which has a larger context window, NVIDIA Nemotron 3 Ultra 550B A55B BF16 or Grok 4.3?+
Grok 4.3 has the larger sourced context window. NVIDIA Nemotron 3 Ultra 550B A55B BF16 supports 262K and Grok 4.3 supports 1,000K.
Which performs better in benchmarks, NVIDIA Nemotron 3 Ultra 550B A55B BF16 or Grok 4.3?+
There is no overall benchmark winner: At least two independently verified, protocol-matched benchmarks are required for an overall winner.
Can NVIDIA Nemotron 3 Ultra 550B A55B BF16 or Grok 4.3 be self-hosted?+
NVIDIA Nemotron 3 Ultra 550B A55B BF16 is the only model in this pair currently marked as self-hostable. NVIDIA Nemotron 3 Ultra 550B A55B BF16 is open weight; Grok 4.3 is not marked open weight.
Can NVIDIA Nemotron 3 Ultra 550B A55B BF16 and Grok 4.3 understand images?+
NVIDIA Nemotron 3 Ultra 550B A55B BF16 is not documented with image input; Grok 4.3 is documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, NVIDIA Nemotron 3 Ultra 550B A55B BF16 or Grok 4.3?+
Neither has a larger sourced maximum output. NVIDIA Nemotron 3 Ultra 550B A55B BF16 is — and Grok 4.3 is —.
Do NVIDIA Nemotron 3 Ultra 550B A55B BF16 and Grok 4.3 support reasoning and tool use?+
NVIDIA Nemotron 3 Ultra 550B A55B BF16: reasoning and tool calling. Grok 4.3: reasoning, tool calling, and image input. Feature support does not establish relative quality.
Which is available from more inference providers, NVIDIA Nemotron 3 Ultra 550B A55B BF16 or Grok 4.3?+
NVIDIA Nemotron 3 Ultra 550B A55B BF16 has 3 sourced provider routes; Grok 4.3 has 1, so NVIDIA Nemotron 3 Ultra 550B A55B BF16 has broader tracked availability.
Which offers better value, NVIDIA Nemotron 3 Ultra 550B A55B BF16 or Grok 4.3?+
There is no universal value winner. Compare the input and output prices above with the matched benchmark result for your workload: cheaper tokens can be offset by different quality, token usage, latency, or provider availability.