Tesla audits Chinese suppliers for Optimus Gen 3: Tuopu, Sanhua and Joyson in the spotlight

Tesla's Optimus team is in China to check whether the humanoid robot's suppliers are ready for mass production, according to Chinese media reports summarised by CnEVPost and TrendForce on September 21. The audits cover factories in the Yangtze River Delta, the industrial region around Shanghai, and mainly involve companies that already supply parts for Tesla's cars.

Tesla has not commented. The details below come from Chinese outlets citing people in the supply chain.

What is reported

• Timing: according to the 21st Century Business Herald, a Tesla team arrived in Ningbo on September 16 and began a new round of mass-production audits the next day.
• Where: the audits are not limited to Ningbo, as earlier rumours suggested, but also cover Hangzhou, Shanghai and other parts of the region, according to The Paper.
• Who: named companies include Tuopu Group, Sanhua Intelligent Controls and Joyson Electronics. Others were not named.
• What they make: core electromechanical parts such as joint modules, actuators, sensors and precision structural parts.
• Orders: The Paper's source said these suppliers had already received Optimus orders before the audits, 'differing only in size'. Production would start soon after a line passes.

What the suppliers say

According to TrendForce, citing Chinese media, Tuopu said Tesla research and development staff are regularly stationed at its Ningbo site and that the two companies work together on linear, rotary and dexterous-hand actuators. Sanhua said it was not aware of the latest audits, but confirmed it is developing robot joint actuators with a major customer, without naming it.

The focus: cost, scale and backup capacity

This is not the first round. An earlier round ran from about September 2025 to February 2026 to prepare for the Gen 3 redesign. It used car-industry standards, with fast cycle times and high yields, and checked how suppliers integrate motors, gearboxes, controllers and encoders, as well as the consistency of parts such as planetary roller screws and torque sensors.

The new round reportedly looks at three things:

• Cost per unit, broken down part by part and measured against a reported target price of about $20,000 for the robot.
• Overseas production, meaning whether suppliers can also make parts outside China.
• Second-tier suppliers, and how well the auditees manage their own supply chains.

The $20,000 figure and a reported target of about 50,000 robots in 2026 come from Chinese media and have not been confirmed by Tesla.

Context: Gen 3 is the first Optimus built for volume

The robot heading for mass production is the third-generation Optimus, the first designed for high-volume manufacturing, with a new hand mechanism and upgraded joint actuators. Its first jobs will be industrial: moving materials and simple help on assembly lines. Tesla has converted the former Model S and Model X lines in Fremont into an Optimus line with a planned capacity of one million robots a year, and a much larger line at Giga Texas, designed for ten million a year in the long term, is expected around next summer.

Musk has called Optimus 'the hardest product to scale manufacturing' that Tesla has made, and said earlier this year that Tesla's biggest humanoid competitors will come from China. Chinese rival XPeng opened an automated production line for its IRON robot earlier this month.

Why it matters

A humanoid robot has thousands of parts, and many of the most important ones, especially actuators and hand components, are made in China's existing car supply chain. Using those suppliers could help Tesla scale quickly and cut costs. But it also ties Optimus to China at a time of trade tension, which may explain why overseas production capacity is part of the checklist.

What to watch next

Watch for confirmation from Tesla or the suppliers that audits have been passed, for supplier filings that mention robot orders, and for the long-delayed public reveal of Optimus Gen 3, which would show what these parts actually go into.