NVIDIA: Nemotron 3 Ultra (free)

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: 1,000,000 tokens
• Input: text
• Output: text
• Pricing: $0/M input tokens, $0/M output tokens

View on OpenRouter. Model data sourced from OpenRouter.