What is Hermes 4?
Nous Research's open-weight Hermes 4 family (14B / 70B / 405B) — a steerable, neutrally-aligned reasoning model with a hybrid 'thinking' mode, strong function calling and structured JSON output for agentic builders.
Hermes 4 sits in the writing category and is listed in the AIverse AI tools directory, where it holds an editorial rating of 4.4 out of 5 based on its capabilities, usability, value for money and reliability. It is developed by Nous Research, founded in 2023.
Hermes 4 features and use cases
People typically use Hermes 4 for Custom agents with tool use, Structured JSON pipelines, Research and fine-tuning and Uncensored, neutral assistants.
It is often associated with LLM, Open Weights, Reasoning, Function Calling and Steerable. Developers can integrate Hermes 4 into their own products through its API.
Hermes 4 pricing
Hermes 4 offers a free plan, with paid tiers (Open weights / API via providers) that unlock more advanced features and higher usage limits.
As with any AI tool, the right plan depends on how heavily you use it. We recommend trying Hermes 4 before committing to a paid plan.
Is Hermes 4 worth it? Our bottom line
Overall, Hermes 4 is a strong choice in the writing category for 2026. Its standout strengths include Highly steerable, neutrally aligned and Hybrid reasoning (think vs. answer). Bear in mind Raw model — you handle safety/guardrails and Largest size is hardware-heavy. If it matches your workflow, Hermes 4 is well worth a try — especially since you can start on a free plan.