BMW and Daimler are reportedly in talks to join hands to develop vehicle platforms for electric cars in a step that could save each carmaker at least $7.9 billion.

However, citing internal sources reports now suggest that the talks to cooperate on vehicle platforms could still fall apart. Ahead of this in January, we reported about a possible partnership between the two companies to include the development of advanced driver assistance systems and other mobility services. In the same breath, both companies have confirmed plans of sharing engineering costs for driverless cars, but have declined to comment on whether their cooperation would include vehicle platforms.

Reports suggest that the recent talks of collaborating for electric car platforms were at its early stages and that it could fall apart.

Back in November last year, BMW’s finance chief suggested that the company was open for a deeper partnership with Daimler, but stated that identifying a win-win opportunity in the area of shared vehicle platform was difficult. Reports also suggest that both the companies are in talks about sharing engineering costs for all-electric compact and midsized cars.

Earlier in January, German news agency Handelsblatt reported that the companies are also reported to start sharing patents in order to put up a fight against their rivals together.

Expensive technology for autonomous driving, as well as electric mobility, have led several companies to join hands for a collaborative partnership. In January, Ford announced a partnership with Volkswagen that was aimed at jointly manufacturing commercial vehicles.

The American automaker and its German partner are also reported to be discussing self-driving as well as EV tech. In June last year, both the companies stated that they were considering a development and production alliance that would include light commercial vehicles to strengthen both the companies’ performance in their home turf as well as globally. Volkswagen is en route to build at least 10 million electric vehicles globally that will be based on the first generation of the MEB platform. It is set to do so with a Golf-size hatchback, internally called the I.D. Neo. However, this will soon be followed by the launch of the I.D. Crozz crossover in the U.S. and China.

Similarly, Japanese automaker Honda has also poised to invest billion in General Motors’ Cruise self-driving division. Meanwhile, a few automakers have also attempted to join hands with American startup Aurora Innovation to source self-driving technology.