http://www.sciencemag.org/news/2020/10/nature-family-journals-inks-first-open-access-deal-institution

The deal covering 55 Nature-branded titles is based on a cost of €9500 per article for immediate open access, higher than prevailing market rates.

The Nature family of journals announced today it has become the first group of highly selective scientific titles to sign an arrangement that will allow researchers to publish articles that are immediately free to read. The deal will allow authors at Germany’s Max Planck research institutes to publish an estimated 400 open-access (OA) papers annually in Nature journals, which have traditionally earned revenues exclusively from subscription fees.