Two months after her design for a 2020 Olympic stadium in Tokyo was scrapped by the government because of spiraling costs, the prizewinning architect Zaha Hadid has taken herself out of the running for the project’s next round of competition.

“It is disappointing that the two years of work and investment in the existing design for a new national stadium for Japan cannot be further developed to meet the new brief through the new design competition,” a spokesman for Zaha Hadid Architects in London said in a statement on Friday, The Guardian newspaper reported.

The office of Ms. Hadid, 64, an Iraqi-British architect who won the Pritzker Architecture Prize in 2004, said it had been unable to find a contractor to partner with in creating a new design, as required under the terms of the new competition.

Many objected to the design and cost of the building — projected to be the most expensive Olympic stadium in recent history — even after officials reduced its size and budget, to $1.37 billion. Ms. Hadid’s earlier version came in at about $2.5 billion, more than twice the $1.1 billion originally allocated for the stadium.