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...
Details
| Field | Value |
|---|---|
| id | nvidia/nemotron-3-ultra-550b-a55b |
| family | nemotron |
| modality | text->text |
| context_length | 512288 |
| max_output_tokens | 512288 |
| release_date | 2026-06-04 |
| is_open_weights | yes |
| supports_tool_call | yes |
| supports_reasoning | yes |
| supports_structured_output | yes |
| supports_attachment | no |
| input_modalities | text |
| output_modalities | text |