Nemotron 3 Ultra 550B (NIM)

Model ID: nvidia/nemotron-3-ultra-550b-a55b Provider: nvidia-nim Tier: paid plans Capabilities: chat

NVIDIA Nemotron 3 Ultra 550B A55B on NIM free endpoints.

Access

Available on paid plans. Call it through the Riven API:

curl https://api.rivenai.io/v1/chat/completions \
  -H "Authorization: Bearer $RIVEN_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "nvidia/nemotron-3-ultra-550b-a55b", "messages": [{"role": "user", "content": "Hello"}]}'

Generated from the live Riven gateway catalog, 2026-07-25.