Meta's Muse AI agent tops App Store and lifts chip stocks

By Splitfeed EditorialLast updated Sep 26, 2026, 20:18 UTC

On September 21 and 22, 2026, Meta's AI agent Muse reached the top of the US App Store and became available on Mac for desktop workflow automation. The launch sent Meta shares up more than 20% and triggered a broad rally among CPU-focused chipmakers: Arm rose as much as 17%, Intel climbed 12%, AMD gained 9%, and Montage Technology surged nearly 14%. Jefferies described Muse as showing all the signs of a killer app, and reports identified Meta as the lead partner on an AGI CPU initiative tied to the demand Muse is expected to generate. Nvidia was a notable absentee from the rally, with analysts pointing to persistent growth fears. Bloomberg also reported that stocks reliant on consumer inertia fell on the news, with brokerage shares flagged as potentially next in line for disruption.

The market reaction matters because it represents a reorientation of AI investment bets away from GPU infrastructure and toward the CPU layer and the software agents that run on it. If Muse sustains its popularity, it could shift how Wall Street prices the broader AI buildout. What remains genuinely in dispute is whether the app's early chart position reflects durable utility or a short-lived novelty spike, and whether the CPU supercycle thesis holds if agent adoption plateaus.

The Pro-AI camp reads the App Store debut and the stock moves as evidence that Meta could quietly win the AI race, a framing amplified by Dennis Koch on Bluesky, who shared commentary from Scott Galloway and Ed Elson making exactly that argument. The Anti-AI camp is far less celebratory. Commenters on Bluesky flagged a zero-day exploit on macOS, a hidden backdoor setting, a ClickFix hijack vector, and prompts that solicit sensitive financial and personal data. Airbagmoments called the product essentially a tool for scammers, tw600040 questioned why anyone would hand Meta access to their emails and calendars, and Harry and CyberMaster each highlighted the security disclosures directly. The Middle Ground camp, represented by Shawn Chauhan, centers on a structural concern: closed platforms now decide unilaterally which AI agents can act on a user's behalf, regardless of whether those agents are safe or beneficial.

The argument that would most quickly settle the durability question is Muse's App Store ranking over the following two to four weeks, alongside any formal security disclosures or patches from Meta addressing the reported vulnerabilities.