MODELS / NVIDIA

NVIDIA: Nemotron 3 Ultra

NVIDIA Nemotron 3 Ultra is a 550B parameter (55B activated) open reasoning model built for long-running autonomous agents handling orchestration and complex tasks across coding, deep research, and enterprise workflows. Its hybrid Mamba-Transformer MoE architecture combines Latent MoE — which calls 4 experts at the inference cost of 1 — with Multi-Token Prediction for reduced generation time on long sequences, and Token Budget support for optimal accuracy with minimum reasoning token output. The model supports a 1M token context window and is fully open under the NVIDIA Open Model License with open weights, training data, and recipes.

TEXTREASONINGZERO DATA RETENTIONREASONINGTOOL-USEIMPLICIT-CACHING
1M
CONTEXT WINDOW
16.4K
MAX OUTPUT TOKENS
$0.32 / 1M tokens
INPUT PRICE
$0.8 / 1M tokens
OUTPUT PRICE
QUICKSTART

Call it in one request.

OpenAI-compatible — change the base URL, and the setup is complete.

SHELL
curl https://enterprise.blackbox.ai/v1/chat/completions \
  -H "Authorization: Bearer $BLACKBOX_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "blackboxai/nvidia/nemotron-3-ultra",
    "messages": [{ "role": "user", "content": "Hello!" }],
    "stream": true
  }'
INPUT: textOUTPUT: textRELEASED: 2026-06-04REGIONS: US
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