Learn Spanish (Latin America): Este modelo es tan caro como ese.

You use the structure tan + adjective + como. In this sentence, tan means "as", caro is the adjective "expensive", and como is the second "as". Together, tan caro como gives us "as expensive as".

Does the adjective caro change if the item is feminine?

Yes! Even when it is between tan and como, the adjective still has to match the noun it describes. Since modelo is masculine, we use caro. If we were comparing something feminine like a house (casa), it would be tan cara como.

Why is the word for "this" este instead of esto?

We use este because modelo is a masculine, singular noun. The word esto is only used for abstract ideas or unknown objects (like when asking "What is this?"). When "this" points to a specific masculine noun, you must use este.

What does ese refer to at the end of the sentence?