On Thursday, Meta Platforms Inc. (NASDAQ:META) CEO Mark Zuckerberg returned to X after nearly three years to unveil the company’s latest AI model.



<h2>Mark Zuckerberg Returns To X</h2>



Zuckerberg broke his long silence on X to introduce Muse Spark 1.1, Meta’s newest artificial intelligence model designed for agentic AI tasks.



In his post, Zuckerberg said Muse Spark 1.1 delivers improved coding, tool use, computer-use capabilities and multimodal reasoning.



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<blockquote>(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.— Mark Zuckerberg (@finkd) July 9, 2026</blockquote>
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Meta described the model as the first major release from its Meta Superintelligence Labs, calling it a significant upgrade over the original Muse Spark.



According to the company, the AI is built to coordinate multiple AI agents working in parallel, manage long-running tasks, retain context across extended sessions and determine when to automate workflows or interact directly with computer interfaces.



The release follows this week’s launch of Muse Image.



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<h2>Elon Musk And X Executive React To Zuckerberg’s Return</h2>



Zuckerberg’s post quickly drew playful responses from rivals.



Nikita Bier, a product executive at Elon Musk’s X, replied, “Hello Mark, would you like me to enable Creator Monetization on your account,” joking about Zuckerberg’s years-long absence from the platform.



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<blockquote>Hello Mark, would you like me to enable Creator Monetization on your account— Nikita Bier (@nikitabier) July 9, 2026</blockquote>
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Musk also chimed in with a brief “Jinx,” likely a nod to the Wednesday announcement about xAI’s Grok 4.5 model, which also focuses on coding, research and complex work tasks.



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<blockquote>Jinx— Elon Musk (@elonmusk) July 9, 2026</blockquote>
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<h2>MKBHD Flags Instagram’s New Muse AI Feature</h2>



Meanwhile, popular tech YouTuber Marques Brownlee, better known as MKBHD, highlighted a Meta AI feature rolling out on Instagram.



“Instagram decided to roll out a new ‘Muse AI’ feature… Then they opted in EVERYONE with a public account,” he wrote on X.



Brownlee also shared instructions for opting out by opening the Instagram profile page, tapping the three-line menu, navigating to “Sharing and reuse” and turning off the settings for both Posts and Reels.



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<blockquote>Instagram decided to roll out a new &#34;Muse AI&#34; feature, that lets users create AI images based on people’s Instagram photos. Then they opted in EVERYONE with a public account To opt out: Click your profile picture 3 bars in the top right scroll down to &#34;Sharing and reuse&#34; Toggle… pic.twitter.com/eWb64iOP7D— Marques Brownlee (@MKBHD) July 10, 2026</blockquote>
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Price Action: Meta shares closed Thursday up 4.70% at $631.48 and gained another 1.25% to $639.36 in after-hours trading, according to Benzinga Pro.



According to Benzinga Edge Stock Rankings, Meta ranks in the 88th percentile for Growth, although the stock has lagged over the medium and long term while showing short-term strength.



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Disclaimer: This content was partially produced with the help of AI tools and was reviewed and published by Benzinga editors.



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Photo courtesy: Shutterstock

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Meta CEO Mark Zuckerberg returned to X after three years to launch Muse Spark 1.1, an agentic AI model. The post drew reactions from Elon Musk and X executives. Meanwhile, MKBHD highlighted a new Instagram Muse AI feature that automatically opted in public accounts, providing instructions for users to opt out. Meta shares rose 4.70% to $631.48 on the news.

- Meta Platforms Inc. CEO Mark Zuckerberg reemerged on X to announce the launch of Muse Spark 1.1, an advanced AI model aimed at agentic tasks.  
- The model supports improved coding and multitasking capabilities, allowing coordination of multiple AI agents in extended sessions.  
- Following the announcement, Meta shares surged by 4.70% and further increased in after-hours trading, reflecting positive market response.

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Mark Zuckerberg Posted on Elon Musk's X for the First Time Since 2023 to Promote Meta's Muse AI—MKBHD Explains How to Opt Out