{"id":"nvidia/nemotron-3-ultra-550b-a55b","name":"Nemotron 3 Ultra","owned_by":"nvidia","description":"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...","context_window":512288,"max_tokens":461059,"type":"language","tags":["reasoning","tool-use"],"released":1780551208,"modalities":{"input":["text"],"output":["text"]},"supported_parameters":["frequency_penalty","include_reasoning","logit_bias","max_tokens","min_p","presence_penalty","reasoning","reasoning_effort","repetition_penalty","response_format","seed","stop","structured_outputs","temperature","tool_choice","tools","top_k","top_p"],"pricing":{"input":"0.0000006","output":"0.0000036","input_cache_read":"0.0000002"},"legal":[]}