Germany's Porsche expects to sell out its most expensive model ever by early December, bolstering earnings as the sports-car maker grapples with rising capacity costs.

"We are close to the finish line" in selling all 918 of the 918 Spyder Hybrid model which starts at €768,026, Porsche sales chief Bernhard Maier told Reuters, citing strong demand from North America.

Only a small double-digit number of the plug-in hybrid model, the price of which can rise up to €947,716 in Germany on optional equipment - was still available, Maier said in an interview.

Production of the 918 Spyder, unveiled at the 2013 Frankfurt auto show, has been limited to 918 cars to underscore the exclusivity of the vehicle and the brand.

Volkswagen-owned Porsche has forecast it will increase overall sales to more than 200,000 next year from a record 162,000 in 2013, benefiting from the new Macan compact SUV released last April.

October deliveries jumped 18 percent to 15,820 autos, Porsche said, extending 10-month sales to 14 percent or 151,462 cars.

Operating profit at Stuttgart-based Porsche edged up 1.8 percent in the first nine months to €1.93 billion, about a fifth of parent VW's €9.41 billion, held back by expansion costs at its two German factories.