---
format: "aidr-story-markdown/v1"
id: "bc9b140ad8777d53f6418f1d0a8af5213d834e91061e3250579bbc1fac399171"
canonical_url: "https://aidr.today/bc9b140a?lang=en"
title: "Open Athena Trains 535B Parameter Marin Model in Fully Open Frontier Run"
lang: "en"
requested_lang: "en"
available_langs: ["en","vi"]
translation_fallback: null
fallback_fields: []
published_at: "2026-09-03T02:58:26.000Z"
category: "Models"
topics: ["llm","open-source","mixture-of-experts"]
source_urls: ["https://huggingnews.com/ai/open-athena-trains-535b-parameter-marin-model-in-fully-open-frontier-run-3b58cc6a"]
summary: "Development of the Marin artificial intelligence model has reached 13% completion on a mixture-of-experts architecture with 23 billion active parameters. The p…"
---

# Open Athena Trains 535B Parameter Marin Model in Fully Open Frontier Run

> [Open the canonical story](<https://aidr.today/bc9b140a?lang=en>)

**Published:** 2026-09-03T02:58:26.000Z
**Category:** Models
**Topics:** llm, open\-source, mixture\-of\-experts

## Summary

Development of the Marin artificial intelligence model has reached 13% completion on a mixture\-of\-experts architecture with 23 billion active parameters\. The p…

## Sources

- [Story source](<https://huggingnews.com/ai/open-athena-trains-535b-parameter-marin-model-in-fully-open-frontier-run-3b58cc6a>)