The basic version is free, while heavier users can choose subscription plans priced at $20 and $100 a month.

Early demand has helped drive a sharp rally in Meta shares.

The company’s stock has climbed more than 20 per cent since Muse launched, adding more than $200 billion to Meta’s market value and taking its shares to their highest level in more than seven months.

Muse recorded 2.8 million downloads across the US and Canada during its first 12 days, according to data from market intelligence firm Apptopia cited by Reuters.

On a comparable basis, Muse recorded around 1.8 million downloads versus 1.3 million for ChatGPT during their respective first 12 days, according to the data.

Muse is currently available on iOS and Android in the US and Canada.

Analysts say one reason for the early interest is Muse’s ability to execute workflows rather than generate text.

BofA Global Research said early reviews suggested users were responding particularly well to the agent’s ability to perform multi-step tasks with limited intervention.

J.P. Morgan analysts said that while it was still early, Muse could become one of the most widely used consumer AI applications since ChatGPT.

The distinction reflects a broader shift in generative AI.

Enthusiasm surrounding Muse has spread beyond Meta.

Meta shares surged more than 11 per cent on Monday as investors reassessed the company’s prospects in consumer AI.

The optimism also helped lift technology and semiconductor stocks, with AMD reaching a $1 trillion market valuation for the first time.

Muse’s rapid start is particularly significant for Meta after criticism surrounding some of its earlier Llama AI models.

The company is now trying to demonstrate that its heavy spending on artificial intelligence can produce products that consumers will actually use — and potentially pay for.