What was Cameron (Summer Glau)'s model number? I know it doesn't say it anywhere in the show, but perhaps someone knows it from another source.
It's never specifically stated. There's some internet chatter (based on the poster below) that she's a TOK715 but this may simply be an embellishment of the graphic artist.
In the pilot episode, she specifically avoids the question
John: What model are you? Are you new? You seem... different.
Cameron : I am.
And in other posters she's just designated as type : Cameron.
Her chassis bears a superficial similarity to the T-888 so she may be some kind of heavily customised T-888 infiltration unit.
While the canon never mentioned exact series number of Cameron, a promotional poster of Terminator: The Sarah Connor Chronicles says that Cameron is of Terminator Class TOK715. So, fans are speculating that she may be T-715.
(Source: Terminator Wikia)