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Open-weight general agent
Hermes
Hermes is the family of open-weight models and agent frameworks from Nous Research. The agent builds on the base model with tool use, function calling, and a configurable runtime that you can self-host or fine-tune.
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Coding
Writing
Best for
- Self-hosted, open-weight deployments
- Users who want to fine-tune the underlying model
- Privacy-sensitive or local-only environments
Not best for
- Hosted-only workflows
- Users who do not want to manage their own inference
Quick facts
- Creator
- Nous Research
- Category
- Open-weight general agent
- Autonomy
- Configurable (human-in-the-loop to autonomous)
- Platforms
- Self-hosted, Linux, macOS, Windows
- Pricing
- Free and open-weight. You pay only for the inference hardware or hosting you use.
In Depth: Hermes
What it can do
- Open-weight base model
- Function calling and tool use
- Fine-tuning support
- Local inference
Setup and requirements
- GPU or hosted inference endpoint
- Optional tool integrations
Safety and limitations
Agents take real actions on your behalf. Read this section before you connect anything important.
- Open-weight — fine-tuning can change behavior
- Run untrusted fine-tunes in a sandbox before connecting real data
Pricing and access
Free and open-weight. You pay only for the inference hardware or hosting you use.
Pricing changes often. We update this writeup as vendor pages change. Always confirm the latest on https://hermes.nousresearch.com before committing.