NVIDIA Nemotron 3 Ultra is an open frontier-reasoning and orchestration model from NVIDIA, with 55B active parameters out of 550B total (MoE). Built on a hybrid Transformer-Mamba mixture-of-experts architecture, it...
Specifications
- Provider
- NVIDIA
- Type
- Open-source / open-weight
- Modality
- text->text
- Context window
- 1M
- Released
- June 4, 2026
Capabilities
Input: textOutput: textConfigurable reasoning effort
Strengths
include_reasoningmax_tokensreasoningreasoning_effortseedtemperaturetool_choicetoolstop_p
