docs(guides): Run Nemotron 3 Ultra free in Hermes Agent (launch guide) (#38769)

* docs(guides): add "Run Nemotron 3 Ultra free in Hermes Agent" launch guide

Day-0 NVIDIA Nemotron 3 Ultra availability on Nous Portal (free June 4-18,
in partnership with NVIDIA + Nebius). Quick Setup walkthrough for selecting
the nvidia/nemotron-3-ultra:free tier, plus switching/troubleshooting notes.
Registered at the top of Guides & Tutorials.

* docs(guides): reword Nemotron lead-in to match launch copy

Frame as Nemotron Coalition induction (working with NVIDIA) + Nebius
partnership for the free tier, rather than a direct NVIDIA partnership,
to avoid overstating the relationship.

* docs(guides): lead Nemotron guide with desktop app, CLI second

Add a one-click desktop-app install track (download → Nous Portal
recommended sign-in → pick the Free-tier nemotron-3-ultra model) as the
recommended path for non-terminal users, and keep the CLI curl flow as
Option B. Update switching/troubleshooting to cover both surfaces.

website/docs/guides/run-nemotron-3-ultra-free.md

@@ -0,0 +1,115 @@
+---
+sidebar_position: 0
+title: "Run Nemotron 3 Ultra free in Hermes Agent"
+description: "Try NVIDIA Nemotron 3 Ultra on Nous Portal — free June 4–18 — with day 0 support in Hermes Agent"
+---
+
+# Run Nemotron 3 Ultra free in Hermes Agent
+
+Nous Research has been inducted into the **Nemotron Coalition** of leading AI labs working with **NVIDIA** to advance open frontier foundation models. In honor of this, we've partnered with **Nebius** to provide **Nemotron 3 Ultra** free on [Nous Portal](https://portal.nousresearch.com) for two weeks (**June 4th – June 18th**). Follow the instructions below to try the model in your Hermes Agent today.
+
+:::info Limited-time offer
+The `nvidia/nemotron-3-ultra:free` tier is available from **June 4th to June 18th**. The `:free` tag is what keeps it on the no-cost plan — pick that exact variant.
+:::
+
+Pick whichever install fits you. The **desktop app** is the easiest — no terminal required. If you live in a terminal, the **command-line** install is right below it.
+
+## Option A — Desktop app (recommended)
+
+The simplest path: a one-click installer with a guided, point-and-click setup. No terminal needed.
+
+### 1. Download and install
+
+[Download the Hermes Desktop installer](https://hermes-agent.nousresearch.com/desktop) for macOS or Windows, then open it. On first launch it finishes setting itself up (usually under a minute).
+
+### 2. Connect Nous Portal
+
+When the app opens, you'll see a "Let's get you set up" screen. Click **Nous Portal** (marked **Recommended**). Your browser opens — create a [Nous Portal](https://portal.nousresearch.com) account (or sign in), choose the **Free** plan, and authorize Hermes. The app connects automatically.
+
+### 3. Pick the free Nemotron 3 Ultra model
+
+After connecting, the app shows a **Default model** card. Click **Change**, search for **nemotron 3 ultra**, and select the variant tagged **Free tier**:
+
+```
+nvidia/nemotron-3-ultra:free
+```
+
+The `:free` tag is what keeps it on the no-cost tier — pick that variant.
+
+### 4. Start chatting
+
+Click **Start chatting**. That's it — you're talking to Nemotron 3 Ultra, free.
+
+## Option B — Command line
+
+Prefer the terminal? You'll need macOS, Linux, or Windows via [WSL](https://learn.microsoft.com/en-us/windows/wsl/install) with `curl` installed (`curl` is preinstalled on most systems).
+
+### 1. Install Hermes Agent
+
+```bash
+curl -fsSL https://hermes-agent.nousresearch.com/install.sh | bash
+```
+
+Prefer to review first? Download [`install.sh`](https://hermes-agent.nousresearch.com/install.sh), inspect it, then run it.
+
+After it finishes, reload your shell:
+
+```bash
+source ~/.bashrc   # or source ~/.zshrc
+```
+
+### 2. Run Quick Setup
+
+```bash
+hermes setup
+```
+
+Select **Quick Setup**. Hermes opens a browser tab and waits for you to finish the next steps.
+
+### 3. Create a Nous Portal account
+
+In the browser, create a [Nous Portal](https://portal.nousresearch.com) account (or sign in) and choose the **Free** plan.
+
+### 4. Connect your account
+
+When prompted to connect your account to Hermes Agent, click **Connect**. You'll see a confirmation once it's linked.
+
+### 5. Select the free Nemotron 3 Ultra model
+
+Return to your terminal. From the model list, select:
+
+```
+nvidia/nemotron-3-ultra:free
+```
+
+The `:free` tag is what keeps it on the no-cost tier, so make sure you pick that variant.
+
+### 6. Start chatting
+
+Complete the remaining Quick Setup prompts, then run:
+
+```bash
+hermes
+```
+
+That's it — you're talking to Nemotron 3 Ultra, free.
+
+## Switching to it later
+
+Already set up with another model?
+
+- **Desktop app:** open the model picker, search for **nemotron 3 ultra**, and select the **Free tier** variant.
+- **CLI / TUI:** switch any time from inside a session with `/model nvidia/nemotron-3-ultra:free`, or run `/model` to open the picker and choose it from the list.
+
+## Troubleshooting
+
+- **Don't see the model in the list?** Make sure you finished the Nous Portal connection and that you're on the **Free** plan. In the CLI, `hermes portal info` confirms you're logged in and routing through Nous.
+- **Picked the wrong variant?** Re-select `nvidia/nemotron-3-ultra:free` — the `:free` suffix is required to stay on the no-cost tier.
+- **Browser didn't open / you're on a remote host (CLI)?** See [OAuth over SSH / Remote Hosts](/guides/oauth-over-ssh) for port-forwarding and manual-paste workarounds.
+
+## See also
+
+- **[Desktop App](/user-guide/desktop)** — The native one-click app (macOS, Windows, Linux)
+- **[Run Hermes Agent with Nous Portal](/guides/run-hermes-with-nous-portal)** — Full Portal walkthrough: models, Tool Gateway, and verification
+- **[Nous Portal integration](/integrations/nous-portal)** — What's in the subscription
+- **[Quickstart](/getting-started/quickstart)** — Install-to-chat in under 5 minutes

website/sidebars.ts

@@ -691,6 +691,7 @@ const sidebars: SidebarsConfig = {
       label: 'Guides & Tutorials',
       collapsed: true,
       items: [
+        'guides/run-nemotron-3-ultra-free',
         'guides/run-hermes-with-nous-portal',
         'guides/tips',
         'guides/local-llm-on-mac',