Release: 2.1.0b1 | Release Date: January 21, 2026

# SQLAlchemy 2.1 Documentation

# Declarative API

## API Reference

Changed in version 1.4: The fundamental structures of the declarative system are now part of SQLAlchemy ORM directly. For these components see:

- `declarative_base()`

- `declared_attr`

- `has_inherited_table()`

- `synonym_for()`

- `sqlalchemy.orm.as_declarative()`

See Declarative Extensions for the remaining Declarative extension classes.