NVIDIA Nemotron 3 Ultra API

NVIDIA Nemotron 3 Ultra is a large language model by NVIDIA, available on the Venice API as nvidia-nemotron-3-ultra-550b-a55b. It runs privately, with zero data retention.NVIDIA Nemotron 3 Ultra is built for frontier reasoning, orchestration, coding agents, deep research, and complex enterprise workflows. It delivers up to 5x faster inference and up to 30% lower cost for agentic workloads while supporting up to 1M token context.

NVIDIA Nemotron 3 Ultra API pricing

Model ID	Variant	Privacy	Price
`nvidia-nemotron-3-ultra-550b-a55b`	Standard	Private	$0.63 input /$ 3.13 output per 1M tokens

NVIDIA Nemotron 3 Ultra specifications

Spec	Value
Provider	NVIDIA
Released	Jun 4, 2026
Privacy	Private
Open weights	Yes
Context window	250K tokens
Max output	32K tokens
Reasoning effort	none, low, medium, high
Served precision	FP8

How to use the NVIDIA Nemotron 3 Ultra API

Send requests to POST https://api.venice.ai/api/v1/chat/completions with "model": "nvidia-nemotron-3-ultra-550b-a55b" and your API key.

curl https://api.venice.ai/api/v1/chat/completions \
  -H "Authorization: Bearer $VENICE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "nvidia-nemotron-3-ultra-550b-a55b",
    "messages": [{ "role": "user", "content": "Explain TEE attestation in two sentences." }],
    "reasoning_effort": "low"
  }'