# Hermes 3

> Open-weights fine-tune of Llama 3.1 built for agentic function calling.

Hermes 3 is an open-source model series by Nous Research fine-tuned on Llama 3.1 across 8B, 70B, and 405B parameters. It is trained primarily on synthetic data with an emphasis on following system prompts precisely, internal monologue reasoning, and multi-turn conversations. Its structured function-calling support makes it popular for building custom autonomous agents and workflows.

Website: https://nousresearch.com/hermes3

## What it is for

- Power autonomous AI agents that invoke external APIs and tools
- Drive conversational workflows requiring strict adherence to system prompts
- Handle complex roleplay and internal monologue reasoning tasks

## Features

- Fine-tuned versions across 8B, 70B, and 405B parameter scales
- Enhanced agentic function-calling capabilities
- Strong adherence to system instructions without heavy safety guardrail interference
- Long-term context retention across multi-turn conversations
- Open weights available on Hugging Face

## Pricing

Open source. Free open-weights model; compute or hosting costs apply.

## Details

- Type: AI model
- Category: [AI](https://xiry.app/topics/ai.md)
- Open source: yes
- Platforms: Web, API, Self-hosted
- For: AI developers, automation builders, and researchers needing unconstrained open-weights models.
- Alternative to: Llama 3.1, Mistral Large, GPT-4o
- Tags: llm, open source, agents, function calling, nous research, llama

## Why it was saved

- [@jordanlee__, 21 May 2025](https://www.instagram.com/reel/DJ7iN3Egy2t/): Used by the creator as an autonomous AI SDR agent to book sales appointments on autopilot.
- [@jordanlee__, 5 May 2025](https://www.instagram.com/reel/DJSOqs3Ax5u/): Presented as an autonomous SDR agent capable of booking sales calls automatically.

## Compare

- [Alternatives to GPT-4o](https://xiry.app/alternatives/gpt-4o.md)

## Related

- [AutoGPT](https://xiry.app/resources/autogpt): Open-source platform and framework for building autonomous AI agents (GitHub repo, Freemium)
- [Dolphin 3.0](https://xiry.app/resources/dolphin-3-0): Uncensored, open-source fine-tuned LLM designed for local execution without guardrails (AI model, Open source)
- [Pinokio](https://xiry.app/resources/pinokio): Browser that installs and runs open-source AI apps with one click (Desktop app, Free)
- [Hermes Agent](https://xiry.app/resources/hermes-agent): Open-source, self-hosted AI agent with persistent memory and messaging integrations. (Open source)
- [AnythingLLM](https://xiry.app/resources/anythingllm): Private, on-device AI assistant to chat with documents and local models. (Desktop app, Open source)
- [browser-use](https://xiry.app/resources/browser-use): Open-source Python library enabling AI agents to control web browsers. (GitHub repo, Open source)

Updated 3 October 2026. Page: https://xiry.app/resources/hermes-3

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