Open Athena Launches Marin, a 535B-Parameter MoE Trained in the Open

Open Athena has started training Marin, a 535B-parameter (23B active) MoE model on 18T tokens including agentic, code and scientific data. The entire training run is public and trackable, marking a milestone for open AI research.

2026-09-03 ~ 2026-09-03 · 2 related posts

• Open Athena Starts Training Marin: 535B-Parameter MoE on 18T Tokens, Fully Open — TheTuringPost · 2026-09-03
• Open-source Marin kicks off 535B/23B MoE pretraining run, fully documented in public — dlwh · 2026-09-03