Notion AI has officially entered a new era of flexibility with the introduction of “open-weight” models for Custom Agents, starting with the integration of MiniMax M2.5.

This update is a strategic shift for users who need to balance high-level automation with cost-efficiency. By offering open-weight models alongside proprietary giants like GPT-5 and Claude 4.6, Notion allows you to route simpler, high-volume tasks to models that are significantly cheaper and faster to run. While proprietary models remain the choice for complex reasoning, these new open-weight options provide a “Goldilocks” solution for routine database updates and basic content generation, ensuring that your Custom Agents remain highly performant without scaling your API or subscription costs unnecessarily.

To swap your agent’s brain, open the Notion AI settings within your chat or agent configuration and select MiniMax M2.5 from the new “Experimental” or “Open Weight Models” section of the dropdown menu.