During Tesla’s Q1 2026 earnings call today, CEO Elon Musk confirmed that Optimus robot production will begin at Fremont in late July or August — just four months after the last Model S and X roll off the line in early May. Musk warned, however, that initial output will be “quite slow,” calling it “literally impossible to predict” the production rate this year given Optimus has 10,000 unique parts across an entirely new production line. Converting the Model S/X line in record time The timeline Musk laid out is aggressive. The last Model S and X vehicles will be produced in early May, ending a 14-year production run for the Model S and 11 years for the Model X. Combined, Tesla produced over 610,000 of these vehicles — but sales had dwindled to roughly 30,000 annually, a fraction of the line’s 100,000-unit capacity. Once the final vehicles are assembled, Tesla will dismantle the entire production line from the ground up — starting with smaller parts production equipment and working forward to final assembly, which Musk said will be torn down next month. Advertisement - scroll for more content Then comes installation of entirely new production equipment for Optimus, including all wiring, communications, and testing infrastructure. Musk framed the four-month conversion as unprecedented: “If we were able to go from stopping production on one line, dismantling that entire line, reinstalling a whole new line, and turning that on in a matter of four months, that is an insanely fast speed. I don’t think any other company on Earth has ever done that before.” 10,000 parts and the “slowest, dumbest” one wins Musk was candid about the challenges ahead, pushing back on investor questions that he said “do not fully understand what happens with a production line.” The core problem: Optimus is a brand-new product with a brand-new production line and over 10,000 unique components — none of which have been through mass production before. “It will move as fast as the least lucky, slowest, dumbest part in the entire 10,000,” Musk said. “It is impossible to predict these things.” He declined to provide any production target for 2026, saying only that initial skills for the robots will be “simple skills in the factory” before building up from there. This represents a significant walk-back from Musk’s January 2025 prediction of “roughly 10,000 Optimus robots” being built that year — a target Tesla missed entirely, with Musk admitting in January 2026 that zero Optimus robots were doing “useful work” in Tesla’s factories. Second Optimus factory at Giga Texas, Gen 3 reveal delayed again Beyond Fremont, Musk confirmed Tesla is constructing a second Optimus factory at Giga Texas, with production expected to begin around summer 2027. That facility is being built on the north campus expansion and is expected to eventually produce the higher-volume Gen 4 variant. As for the Gen 3 reveal that was originally expected in Q1 2026, Musk pushed the timeline again — this time to “probably middle of this year.” The reason? Tesla says competitors “do a frame-by-frame analysis whenever we release something and copy everything they possibly can.” It’s worth noting that Tesla’s competitors aren’t standing still. Boston Dynamics is shipping its electric Atlas humanoid to Hyundai factories this year, with plans for a production facility capable of 30,000 units annually. Figure AI, valued at $39 billion, has an active pilot deployment at BMW. And Agility Robotics’ Digit is already commercially deployed in customer warehouses, including at a Toyota plant in Ontario. Electrek’s Take We’ve been tracking Elon Musk’s Optimus promises for years now, and the pattern is familiar: grand vision, ambitious timelines, then reality hits. In January 2025, Musk said Tesla would build 10,000 Optimus robots that year. By January 2026, he admitted none were doing useful work. Now, the target is simply “start production” with no volume commitment. To his credit, Musk was more measured on this call than usual. Telling investors “it is impossible to predict” production rates and walking them through the practical realities of dismantling one production line and installing another is the kind of reality injection that’s been missing from previous Optimus discussions. The four-month Fremont conversion is genuinely ambitious — but “starting production” and “producing meaningful quantities” are very different things. Tesla’s own Cybertruck took over a year to ramp from first production to meaningful volume, and that was a vehicle leveraging Tesla’s existing automotive manufacturing expertise. Optimus is something entirely new. The real competition question isn’t whether Tesla can start building robots — it’s whether those robots can actually do useful work at scale. So far, the answer has been no. Every other claim needs to be weighed against that track record. Stay up to date with the latest content by subscribing to Electrek on Google News. 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