OpenRouter serves NVIDIA Nemotron 3 Ultra (free) through the route nvidia/nemotron-3-ultra-550b-a55b:free at $0 per 1M input and output tokens. The text model supports a 1,000,000-token context window and up to 65,536 output tokens; free requests are rate limited and NVIDIA logs submitted content.
Use-case fit and limitations from the existing resource record.
Rate limits, no service guarantee, upstream availability variability, data logging; avoid confidential or personal data.
Available
Non-price resource facts only; pricing, history, and evidence stay in their own sections.
Decision visuals remain traceable to the existing source and verification record.
Independent ranking · native prices · evidence-linked · commercial relationships isolated from scoring and publication.