The Tesla chief executive, Elon Musk, has claimed the company will produce “genuinely useful” humanoid robots to start working in its factories next year.

The world’s richest person, who has a penchant for making overambitious claims on social media, posted on his platform X, formerly Twitter, that he also hoped to expand into “high production” mode to make robots with a humanlike form available sell to other companies in 2026.

Musk, who owns X and is also the boss of SpaceX, has previously made bold claims about when the robot, called Optimus, would be ready for commercial use. In 2021, the billionaire, estimated by Forbes to be worth $250bn (£194bn), said he expected the mechanoid to be ready for use in Tesla factories the following year.

Optimus is about 1.7 metres tall and weighs 56kg; it is designed to do “boring, repetitious and dangerous” work. The name is an allusion to Optimus Prime, the powerful and benevolent leader of the Autobots in the Transformers media franchise.

At a Tesla AI Day event in 2021 to launch the humanoid robot, at the time dubbed the “Tesla Bot”, Musk hosted a bizarre demonstration featuring an actor in a bodysuit who proceeded to breakdance to a soundtrack of electronic dance music.

At another AI Day event in 2022, Musk – who has claimed Tesla’s robot business will one day be worth more than its cars – demonstrated a prototype of the robot that walked on stage and waved to the audience.

A video of the robot carrying a box, watering plants and moving metal bars in the carmaker’s factory was shown.

Musk has said previously his aim is for the robots to be mass-produced and cost less than $20,000 each.

Optimus is not the only Musk project to be running behind his initial projections. In 2019, he said he felt “very confident” Tesla would have self-driving taxis on the road the following year.

Earlier this year, he said the model would be unveiled on 8 August, but it looks likely to be delayed after Musk said he had requested a change to the front of the vehicle.