Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_203_873 ( id number, "model name" text, "length" text, "width" text, "height" text, "riders" number, "capacity" number, "description" text, "portable" text, "notes" number )

### Question ###
how many models have a capacity other than 600 ?

### Accurate SQL ###

SELECT COUNT("model name") FROM table_203_873 WHERE "capacity" <> 600