SYS://REGISTRY
LEDGER/NVIDIA/nemotron-3-ultra
DATASHEET
NVIDIA/RELEASED Jun 4, 2026

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+ Weights Free to Self-Host
License
NVIDIA Open Model License
Quickstart Snippet
curl -s https://modelregistry.tirup.in/api/cli?model=nemotron-3-ultra