According to Reuters, an unnamed source is said to have confirmed that joint production plans have been dropped, citing an internal document.
News of the separation was first reported by Agence France-Presse, but neither Renault nor Caterham have commented on the reports to date.
Renault is still believed to be pushing ahead with plans to revive the Renault Alpine, but the French carmaker will continue development and production of the sports car alone.
The Alpine project has been the subject of constant on-again, off-again reports since its inception as a joint venture in 2012.
In June last year, reports out of Europe suggested the legal paperwork had been delayed, and that Caterham was yet to stump up the cash for the project.
One month later, further reports suggested Caterham was keen to extend its partnership with Renault, with plans to build a Renault-based SUV along with small and light cars on Renault platforms.
According to Britain’s Autocar, Caterham is still planning to launch its own version of the Alpine project, with both Renault and Caterham looking at a 2016 debut.
2015 was originally planned as the launch year for Renault, but recent design woes have reportedly caused a rethink on the sports car, and a delayed launch date.