Both bet on semantics, in different places
Omni and Cortex share a premise: AI answers are only trustworthy when they are grounded in shared business definitions. Omni builds that model inside the BI tool, where it backs dashboards, SQL workflows, workbooks, and AI chat. Snowflake builds it into the warehouse as Semantic Views, where YAML spells out the metrics, joins, synonyms, and verified example queries Cortex Analyst consults before it writes SQL.
That placement drives most of the tradeoffs. A model in Omni is used by every surface in the product, and it belongs to the BI layer rather than to the warehouse underneath. A model in Snowflake sits beside the data, inherits Snowflake roles and row-level security, and can be called from any app through the Cortex API, but nothing outside Cortex reads it automatically.