Nvidia Drops Its Giant 550B Nemotron 3 Ultra on OpenRouter for Literally Free
Nvidia is throwing a free AI party, but you can’t take the beer home. They just put their massive 550B Nemotron 3 Ultra on OpenRouter for exactly zero dollars, letting us play with a monster model before they pull the plug.
The tech giant's leather-jacketed boss, Jensen Huang, first showed off this monstrosity in Taipei, and now the weights are officially out. But unless someone has a spare warehouse of commercial accelerators in their garage, downloading these 550 billion parameters to a home PC is a comedy routine.
That is why the real juice is the temporary free hosting on OpenRouter, offering zero-dollar API calls for both input and output tokens alongside a massive one-million-token context window. Under the hood, this beast runs on a hybrid Mamba-Transformer architecture, spitting out over 300 tokens per second during early tests to make standard open-source models look like they are typing through molasses.
Independent testing by Artificial Analysis gave the model a score of 48 on their index, making it the highest-rated open-weights model born in the US. However, this American pride still gets completely schooled by Chinese open-weights giants like Kimi K2.6 from Moonshot AI and the latest DeepSeek V4 Pro, which rule the leaderboard even if they require a paid subscription.
Silicon Valley keeps bleeding cash on free compute just to stay relevant against Chinese developers who are quietly building better models for actual profit. It is a glorious, temporary welfare state for AI developers, until the green giant remembers it loves money and flips the paywall switch.
Source: OpenRouter
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