Nemotron 3 Ultra 550B

550B OPEN GIANT

550B open model with a generous free tier; top-10 OpenRouter volume for high-throughput open inference and experimentation.

Context

262,144 tokens

Architecture

550B MoE (55B Activated)

Official API (1M)

$0.6 in / $2.4 out (Open)+ Weights Free to Self-Host

License

NVIDIA Open Model License

Quickstart

curl -s https://modelregistry.tirup.in/api/cli?model=nemotron-3-ultra