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The wp_insert_post action is called with the same parameters as the save_post action (the post ID for the post being created), but is only called for new posts and only after save_post has run. Please see Plugin_API/Action_Reference/save_post for more information. Keep in mind that this action is called both for actions in the admin as well as anytime the wp_insert_post() function is invoked.
This action can be replicated by creating a conditional in a save_post action that excludes certain post statuses.