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Hermes (NousResearch)

Fine-tuned open models built for tool use, function calling, and agentic reasoning.

NousResearch's Hermes series are fine-tuned open-source models optimized for agentic tasks — tool calling, structured JSON output, multi-step reasoning, and system prompt adherence. Built on top of Llama and Mistral base models, Hermes models consistently outperform their base counterparts on function calling benchmarks and are a popular choice for self-hosted agentic pipelines.

Open SourceModelsTool UseAgentic

Published Mar 10, 2026

Visual coming soon

Use Cases

  • Power agentic pipelines that require reliable tool use without cloud model costs
  • Structured JSON output for workflows that need deterministic data extraction
  • Self-hosted agent backends with strong instruction-following and reasoning
  • Fine-tuning foundation for specialized domain agents

Specifications

Model Sizes7B, 8B, 70B (Llama/Mistral base)
SpecializationTool use, function calling, structured output
DownloadHuggingFace (nousresearch/hermes-*)
LicenseLlama community / Mistral license

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