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Hermes 4.3

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Hermes 4.3 is an updated flagship in the Hermes line, trained to balance strong reasoning with practical deployment. Built on ByteDance’s Seed-OSS-36B base, it extends context length to roughly 512k tokens and is aligned to answer more questions while respecting user values, achieving state-of-the-art scores on RefusalBench among non-ablated models. The model targets local and self-hosted setups where users want near-frontier quality without depending on closed APIs.
New Text Gen 7
Released: November 17, 2025

Overview

Hermes 4.3 is Nous Research’s 36B hybrid reasoning model, based on Seed-OSS-36B, offering long context (up to 512k) and very high helpfulness on RefusalBench while staying locally deployable.

About Nous Research

Nous Research is a leader in the American open source AI movement. We train world-class open source language models and build infrastructure to coordinate distributed, unbiased training.

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Last updated: February 12, 2026
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