According to World Nuclear News, the International Atomic Energy Agency just adopted a report saying that Iran hasn’t been working toward a nuclear weapon since 2009:
The IAEA assessment found that a “range of activities relevant to the development of a nuclear explosive device” had been conducted in Iran prior to the end of 2003 as a coordinated effort, and that some activities had taken place after 2003. However, Amano also said that such activities “did not advance beyond feasibility and scientific studies, and the acquisition of certain relevant technical competences and capabilities”. The IAEA had “no credible indications of activities in Iran relevant to the development of a nuclear explosive device after 2009”.
Under the Joint Comprehensive Plan of Action negotiated between Iran and China, France, Germany, Russia, the U.K., the U.S. and the European Union, Iran will be implementing a comprehensive safeguards agreement, which would lead to resumed technical cooperation on peaceful uses of nuclear energy with the IAEA.