Nemotron-4 340B Instruct

Nemotron-4 340B Instruct is NVIDIA's 340-billion-parameter dense language model, released in June 2024 and positioned primarily as a synthetic-data-generation engine rather than a general-purpose chat backend. At 340B parameters in a non-MoE architecture, it is one of the few open models in this class — nearly all comparable-scale open releases have shifted to mixture-of-experts to manage inference cost. The 4K context ceiling is a significant limitation for document or multi-turn workloads, and the NVIDIA Open Model License permits commercial use but is not OSI-approved, so review it with your legal team. In practice, hosting is concentrated on NVIDIA's own NIM service, meaning provider choice is limited. Best suited for teams generating synthetic fine-tuning data at scale who need a large dense reference model.