How to install hermes AI on Windows?
Hermes is a family of open-weight models from Nous Research. The easiest Windows install is Ollama: download the Windows installer from ollama.com, then run `ollama run nous-hermes` in PowerShell. LM Studio is the point-and-click alternative. A 7B model needs about 8 GB of RAM; 13B needs about 16 GB.
Why — the first-principles explanation
First, disambiguate, because "Hermes AI" is three different things and installing the wrong one wastes an afternoon. Most people searching this want Nous Research's Hermes models — open-weight language models, originally fine-tunes of Llama, that you download and run on your own machine. Separately there's Hermes Agent, Nous Research's agent software that drives a model. And there are unrelated commercial products that happen to use the name. This answer covers the models.
The key mental shift: an open-weight model isn't an app you install. It's a file of numbers. The weights are the trained parameters, and they're inert — they can't do anything without a program to run them. So installing Hermes on Windows is really two separate things: get a runner (the program that does the math), and get the weights (the model file). Ollama and LM Studio are both runners that also handle downloading weights, which is why they feel like one step.
The hardware constraint follows directly from that. Every parameter has to live in memory while the model runs, so model size dictates RAM. A 7-billion-parameter model at 4-bit quantization needs roughly 8 GB; a 13B needs roughly 16 GB. Quantization is the reason this works on consumer hardware at all — it stores each weight in 4 bits instead of 16, shrinking the file about 4x for a modest quality hit. If the model fits in your GPU's VRAM it will be fast; if it spills into system RAM it will be slow but still functional.
One honest note on version: the `nous-hermes` entry in Ollama's library covers the older Llama and Llama 2 based models (7B and 13B). Nous Research has released considerably newer Hermes generations since. If you want the current one, search the model catalog in LM Studio or Ollama for the latest Hermes tag rather than assuming `nous-hermes` is the newest.
An example that makes it click
Think of it like getting a song onto your phone. The MP3 file is the music, but the file alone does nothing — you need a player app. Download Spotify, search the song, hit play, and you never think about the file at all.
Ollama is the player. `ollama run nous-hermes` is hitting play. It notices you don't have the song yet, downloads it, and starts it — one command, two jobs. And the reason a 13B model needs 16 GB of RAM is the same reason a huge video won't open on a full phone: the whole thing has to be loaded to play.
How to do it
- Check your hardware first: 8 GB free RAM for a 7B model, 16 GB for a 13B. A GPU with enough VRAM makes it much faster but is not required.
- Option A (command line): download the Ollama Windows installer from ollama.com and run it. No WSL2 required.
- Open PowerShell and run `ollama run nous-hermes`. It downloads the weights (~4 GB for the 7B, 4-bit quantized) and drops you into a chat prompt.
- To download without starting a chat, use `ollama pull nous-hermes`. To pick a size, use a tag such as `ollama run nous-hermes:13b`.
- Option B (graphical): download LM Studio for Windows from lmstudio.ai, install, search 'hermes' in the model catalog, click Download, then Load and chat.
- For a newer Hermes generation, search the catalog by name rather than using the plain `nous-hermes` tag, which covers the older Llama and Llama 2 based releases.
- Only download weights from official sources — Ollama's library, LM Studio's catalog, or Nous Research's Hugging Face organization. Model files from random sites are a real malware vector.
Key facts
- Nous-Hermes on Ollama is described as general use models based on Llama and Llama 2 from Nous Research.
- Available variants on the `nous-hermes` Ollama tag include 7B and 13B parameter models, with 4-bit quantization as the default.
- The documented pull command is `ollama pull nous-hermes`; `ollama run nous-hermes` downloads and launches in one step.
- Stated minimum memory: 8 GB RAM for 7B models, 16 GB RAM for 13B models.
- Ollama ships a native Windows installer, so WSL2 is not required as of 2026-07.
- Original Hermes weights are published by Nous Research on Hugging Face; Ollama and LM Studio redistribute quantized builds.
▶ The 60-second explainer (script)
To install Hermes AI on Windows, the fastest path is Ollama. Download the Windows installer from ollama dot com, run it, open PowerShell, and type: ollama run nous-hermes. That's it. It downloads the model and drops you straight into a chat. Prefer clicking to typing? Install LM Studio from lmstudio dot ai, search "hermes" in the model catalog, hit Download, then Load. Same result, no terminal. But first — know what you're installing. Hermes is a family of open-weight models from Nous Research. Open-weight means the model is a file of numbers. The file alone does nothing. It's like an MP3: the music is in the file, but you need a player. Ollama and LM Studio are the players. That's why one command does two jobs — it grabs the file and hits play. Your hardware constraint comes from that same fact. Every parameter has to sit in memory while the model runs. A seven-billion-parameter model needs about eight gigs of RAM. Thirteen billion needs about sixteen. If it fits on your GPU, it's fast. If it spills to system RAM, it's slow but works. Two warnings. The plain nous-hermes tag is the older Llama-based generation — search the catalog if you want the newest Hermes. And only pull weights from official sources. Random model files from random sites are a genuine malware risk.
What authoritative sources say
People also ask
Do I need a GPU?
No. Ollama and LM Studio run on CPU with enough RAM — 8 GB for a 7B model. A GPU with sufficient VRAM makes generation several times faster but isn't required.
Do I need WSL2?
No. Ollama ships a native Windows installer, and LM Studio is a native Windows app. WSL2 was needed in earlier years and no longer is.
Is it free?
Yes. The runners are free and the weights are open. You pay in disk space, RAM, and electricity, not subscription fees, and nothing you type leaves your machine.
Which Hermes version should I get?
The plain `nous-hermes` tag is the older Llama/Llama 2 generation. Nous Research has shipped newer Hermes releases since, so search the Ollama or LM Studio catalog by name for the current one.
Is 'Hermes AI' the same as 'Hermes Agent'?
No. Hermes models are the weights. Hermes Agent is Nous Research's agent software that drives a model — you can point it at a local Hermes model via Ollama.