Zuckerberg’s return to X after 3 years wasn’t about Elon Musk. It was about AI

When Mark Zuckerberg posted on X for the first time in three years, speculation naturally turned toward his long, public rivalry with the platform’s owner, Elon Musk. The actual reason was more mundane, and arguably more consequential for Meta’s business: a major AI product launch.

Zuckerberg used the platform as a “megaphone” for probably Meta’s biggest AI launch of the year, announcing public developer access to Muse Spark 1.1. “Today we’re releasing Muse Spark 1.1 — a strong agentic and coding model at a very low price. It’s available through our new Meta Model API and in Meta AI,” he wrote, adding that the model “is strongest at agentic performance, tool use, and computer use.”

The launch marks a strategic pivot for Meta, moving the company from purely free, open-source AI technology into the paid enterprise market, setting up direct competition with Anthropic and OpenAI. According to Meta, the model does well on long-running tasks thanks to a 1M token context window, can delegate execution to sub-agents running in parallel, and is trained to use computer interfaces across desktop, mobile and browser.

Meta first tested a baseline version of Muse Spark in April through a private preview with select corporate partners. Starting Thursday, developers in the US can access the upgraded model in public preview on the Meta Model API, with $20 in free trial credits offered before users are switched to pay-as-you-go pricing.