The deal would have "effectively left Iran as a threshold nuclear power," he told a Washington think-tank in a recorded speech, adding Israel's "voice and our concerns played a critical role in preventing a bad deal."
Israel has publicly criticized US-led efforts to reach a deal to rein in Iran's suspect nuclear program, warning that the administration of President Barack Obama is being fooled by the new, more moderate face of the Iranian leadership.
Netanyahu said Israel's aim is now to work for a deal which would dismantle all of Tehran's weapons capability.