# Nemotron 3 Ultra

> NVIDIA's largest Nemotron 3 model.

- Maker: NVIDIA (https://build.nvidia.com)
- Type: Reasoning, open weights
- Artificial Analysis Intelligence Index: 12
- Context window: 262K
- Output speed: 158 tokens a second
- Scores checked 30 October 2026 at https://artificialanalysis.ai/leaderboards/models

## Where to use it through an API

- NVIDIA: model id `nvidia/nemotron-3-ultra-550b-a55b` (free key available), flagship

## Use it free

- NVIDIA NIM free API key: how to get one: https://www.multiscreenai.com/free/nvidia-api-key

## Use it with every other AI at once

MultiScreenAI (https://www.multiscreenai.com) puts Nemotron 3 Ultra on one screen next to ChatGPT, Claude, Gemini and 300+ models: one message goes to every panel, and a timed, blind test mode shows which answers best. Pro is free with a follow on X, and you use your own API keys.
AI agents and coding harnesses (Claude Code, Codex, Cursor, Gemini CLI) can ask Nemotron 3 Ultra and other models at once through the MCP server at https://www.multiscreenai.com/api/mcp/ai; setup: https://www.multiscreenai.com/mcp