On April 20, 2026, Tesla CEO Elon Musk addressed the publication of a patent application detailing the mechanical structure of the Optimus humanoid robot hand. Musk clarified that the design represented in the filing is an outdated version that failed to meet performance requirements during internal testing. He noted that the specific architecture described in the patent "didn't actually work" in practice, leading the engineering team to pivot to a more advanced configuration currently being integrated into the latest prototypes.
The patent in question focused on the actuator assembly and tendon-driven system intended to mimic human dexterity. Earlier versions of the Optimus hand featured 11 degrees of freedom. However, the design Musk referenced as flawed was part of an interim development phase between the first generation and the recently unveiled Gen 2 hardware. The Gen 2 hand, which Tesla showcased in recent demonstrations, features 22 degrees of freedom, allowing for significantly more complex manipulation of objects. Musk emphasized that the lag between patent filings and public disclosure often results in the publication of designs that the company has already abandoned.
Tesla’s robotics division, led by Milan Kovac, Director of Optimus and Autopilot Engineering, has been tasked with achieving human-level dexterity to enable the robot to perform factory tasks. The transition from the design mentioned by Musk to the current 22-degree-of-freedom hand involved a complete overhaul of the forearm and wrist actuators. According to company statements, the newer design utilizes integrated sensors and high-torque motors that provide tactile feedback, a feature missing from the design described in the April 20 patent release.
During a brief exchange on the social media platform X, Musk explained that Tesla’s approach to robotics involves rapid prototyping and iterative testing to identify mechanical bottlenecks. The disclosure follows Tesla’s broader strategy of vertical integration, where the company designs its own actuators, battery packs, and control systems specifically for the Optimus platform. Musk reiterated that the company expects to have Optimus units performing useful tasks in Tesla’s electric vehicle assembly plants by the end of 2026, despite the iterative challenges faced during the development of the hand’s complex mechanical linkages.
The Optimus project remains a central pillar of Tesla’s long-term autonomy goals. While the patent filing provides a historical look at the project's engineering hurdles, the company continues to focus on the mass-producibility of the Gen 2 design. Tesla has previously indicated that the cost of the robot could eventually drop below $20,000 once high-volume production is achieved. The revelation of the flawed patent design underscores the technical volatility inherent in humanoid robotics, where software capabilities often outpace the reliability of experimental hardware.