Python package and CLI 1.21.0

Jul 13, 2026, 1:26 PM UTC

PyRel 1.21.0 introduces a new public preview feature called deploy mode that lets you deploy a PyRel model to a Snowflake schema as SQL tables and views.

How to install this version

Review the changes below before installing. To install this version, activate a compatible Python virtual environment and run:

python -m pip install "relationalai==1.21.0"

For the latest installation instructions, see Start building with PyRel.

New Features and Enhancements

• PyRel 1.21.0 introduces a new public preview feature called deploy mode that lets you deploy a PyRel model to a Snowflake schema as SQL tables and views. For more information, see Deploy a model.

• Improved the clarity of error messages when you define membership between concept types that do not match in Model.define(). Before this release, m.define(Target(Source)) could fail with a generic type-mismatch message that did not tell you how to fix the model. Now the error explains compatible fixes, such as making Target a subtype of Source or using AnyEntity when you intentionally allow heterogeneous membership. This example shows one invalid definition and two valid fixes:

  from relationalai.semantics import AnyEntity, Model
  
  m = Model("Demo")
  SourceConcept = m.Concept("Order")
  
  # Invalid: TargetConcept does not extend SourceConcept.
  TargetConcept = m.Concept("NeedsReview")
  m.define(TargetConcept(SourceConcept))
  
  # Valid fix 1: make the target concept a subtype of SourceConcept.
  TargetSubtype = m.Concept("OrderThatNeedsReview", extends=[SourceConcept])
  m.define(TargetSubtype(SourceConcept))
  
  # Valid fix 2: use AnyEntity when membership should accept mixed concept types.
  TargetAnyEntity = m.Concept("NeedsReviewAny", extends=[AnyEntity])
  m.define(TargetAnyEntity(SourceConcept))