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TL;DR: As verified September 12, 2026, the latest official Nous Research Hermes Agent release is v0.21.2 (tag v2026.9.11), dated and published on GitHub September 11, 2026. It is a reliability patch that repairs the session database failures some installs met after v0.21.0, and it rolls up everything else that landed in the four days since v0.21.1. Hermes Agent is open-source agent software that uses models, tools, memory and messaging channels — it is not itself a Nous language model. This project ships frequently, so confirm the current tag on the official releases page before you install.
What was verified and when
On September 12, 2026, the official releases page listed v0.21.2 (v2026.9.11) as the newest tag, published September 11 at 19:20 UTC, with v0.21.1 (September 7) and v0.21.0 (August 31) immediately behind it. If you arrived here searching for the latest Nous Hermes model of 2026, read this as the latest Hermes Agent software release, not a new Nous language model. An earlier version of this article named v0.18.2 from July as the latest checked release; that entry is kept in the version history below, but it is no longer current. Always confirm the live tag in Sources before you install or update.
| Question | Verified answer |
|---|
| Latest release checked | v0.21.2 (tag v2026.9.11) |
| Release date | September 11, 2026 |
| GitHub publication | September 11, 2026, 19:20 UTC |
| Previous tags | v0.21.1 — September 7, 2026 · v0.21.0 — August 31, 2026 · v0.18.2 — July 7, 2026 |
| Publisher | Nous Research |
| Product type | Open-source AI agent application |
| Official source | NousResearch/hermes-agent releases |
What v0.21.2 changed
The release notes call it the state.db patch release, and the description is unusually honest about what went wrong. Version 0.21.0 had rewritten how the session store handles connections, and for some installs that made the local state.db fragile: second writers cancelling each other's locks, healthy databases reported as corrupt, and a single bad row able to kill the whole session listing. Version 0.21.2 closes that class of failure with six fixes covering forty-four reported issues, and it rolls up the rest of what landed on the main branch in the four days since v0.21.1 — 947 commits across 312 merged pull requests from 140 contributors.
In practical terms, the patch removes every second writer to the database: hosted-room state moves to its own file, the dashboard opens read-only first, and the repair command refuses any checkpoint it cannot prove safe. Full-text-search damage no longer ends a conversation — search degrades and the index rebuilds while transcripts stay untouched — and one corrupt row renders as a named warning instead of crashing exports and insights. Sessions can no longer bind to another profile's database, and opening the store behind a busy gateway drops from seconds of stalling to a fraction of a second. The same window also hardens multi-profile isolation, ends the desktop backend spawn storms, adds a password-blind credential vault that signs in and pays without ever showing the agent a secret, ships a curated SHA-pinned plugin catalog with one Plugins page, and offers free inference with a guided first launch.
