Hermes Agent by NousResearch is an open-source AI agent that does something most frameworks do not: it learns from experience. It creates skills during use, refines its memory across sessions, and supports parallel subagents and a built-in cron scheduler. You can run it on a $5 VPS, a GPU cluster, or serverless infrastructure.
The part that makes it immediately approachable is its provider flexibility. Hermes supports 200+ models across a growing list of providers, and you switch between them with a single command — no code changes. That means you can get started entirely on free tiers before committing to a paid API.
This post covers which free providers work with Hermes Agent and how to get up and running with each.
Installing Hermes Agent
curl -fsSL https://raw.githubusercontent.com/NousResearch/hermes-agent/main/scripts/install.sh | bash
source ~/.bashrc
hermes
That drops you into the interactive CLI. Run hermes setup to walk through the full configuration wizard, or hermes setup --portal to connect via Nous Portal (their own hosted service with OAuth, which consolidates all your API keys into one subscription).
Switching providers
Once installed, switching providers is a single command:
hermes model
Or inline during a conversation: /model [provider:model]
No config file edits, no restarts. This is what makes free-tier exploration practical — you can try a model, hit a rate limit, and switch to another in seconds.
Free providers supported by Hermes Agent
Nous Portal
Nous Portal is Hermes's native provider. It consolidates model access, web search, image generation, and TTS under one subscription. If you want the tightest integration with Hermes and the Nous ecosystem, this is the starting point. Check their current free tier on signup.
OpenRouter
OpenRouter is the most flexible free option. It gives you access to 200+ models — including Llama 4, DeepSeek, Gemma, and Mistral — through a single API key. The free tier covers 27+ models (marked with a :free suffix) at 200 requests per day and 20 requests per minute.
Because Hermes supports OpenRouter natively, you can point it at any of those free models immediately. This is the best option if you want to compare how Hermes behaves across different underlying models without managing multiple accounts.
NVIDIA NIM
NVIDIA NIM gives you free API credits on signup with no credit card required. The catalog includes 80+ models — Llama 4, Qwen, Mistral, and NousResearch's own Hermes 3 model — at roughly 40 requests per minute. Credits do not expire.
NIM is the best free option if you specifically want to run a NousResearch model underneath Hermes Agent, since it hosts the Hermes 3 fine-tune directly.
Hugging Face
Hugging Face Inference Providers gives every account monthly free credits routed across a network of inference providers (Groq, Together, SambaNova, and others). Hermes Agent supports HuggingFace natively.
The free tier is best for trying niche or smaller models. Cold starts can be slow on the free tier, so it is less suitable for long interactive sessions but fine for batch tasks or evaluation.
NovitaAI
NovitaAI is a cost-efficient inference provider with a generous free tier for new accounts. Hermes supports it natively. It is worth trying if OpenRouter and NVIDIA NIM rate limits become a bottleneck during heavy agent development.
Kimi / Moonshot
Kimi (by Moonshot AI) offers a free tier with long-context models. Hermes Agent lists it as a supported provider. Particularly useful if your agent tasks involve processing large documents or long conversation histories that would exhaust the context windows of other free-tier models.
Provider comparison at a glance
| Provider | Free Tier | Best for with Hermes |
|---|---|---|
| Nous Portal | Check on signup | Tightest Hermes integration |
| OpenRouter | 200 req/day, 27+ free models | Model variety, easy switching |
| NVIDIA NIM | Credits on signup, no expiry | Running NousResearch models |
| Hugging Face | Monthly credits | Niche models, batch tasks |
| NovitaAI | Free credits on signup | Alternative when hitting rate limits |
| Kimi / Moonshot | Free tier | Long-context tasks |
Tips for running Hermes on free tiers
Rate limits compound in agentic loops. Hermes's learning loop and subagent features can make many model calls per task. At 20 req/min (OpenRouter free), a multi-step task hits the ceiling quickly. Use hermes model to switch to a provider with a higher limit mid-session, or configure a fallback provider.
Use NVIDIA NIM for NousResearch models specifically. If you want the model that Hermes was designed around — the Hermes 3 fine-tune — NIM hosts it directly at nousresearch/hermes-3-llama-3.1-70b. The free credits cover meaningful development without hitting a daily request cap.
OpenRouter first for exploration. Its unified free tier across 27+ models is the fastest way to understand how Hermes Agent behaves with different underlying models. No separate accounts, one key, switch with /model.
Run hermes doctor when something breaks. The built-in diagnostics command checks your provider configuration and surfaces misconfigurations before you spend time debugging the wrong thing.
Summary
Hermes Agent is one of the few open-source agents with a genuine learning loop built in, and its multi-provider support means you are not locked into any single API. To get started for free: install Hermes, run hermes setup, and connect OpenRouter or NVIDIA NIM — both work out of the box with no credit card. Switch models with hermes model as you explore what works best for your use case.