Mark Zuckerberg returns to X after 3 years to unveil Muse Spark 1.1, Meta's agentic AI model

Mark Zuckerberg Returns to X After Three-Year Absence

Mark Zuckerberg made an unexpected return to Elon Musk's X platform on Thursday after a three-year hiatus, breaking his silence to announce Muse Spark 1.1, Meta AI's latest agentic and coding AI model 1

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. The Meta CEO's last post on X dated back to July 5, 2023, when he shared a Spider-Man meme. His return generated significant attention, with the announcement quickly surpassing 12 million views 2

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The abrupt comeback sparked immediate debate within the tech community about why Zuckerberg chose to make the announcement on a rival's platform rather than on Threads, Meta's own social network. Elon Musk himself chimed in with a brief "Jinx" comment, likely referencing xAI's Wednesday announcement of Grok 4.5, which also targets coding, reasoning, and agentic tasks 3

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. Nikita Bier, a product executive at X, playfully offered to enable Creator Monetization on Zuckerberg's account.

Muse Spark 1.1 Delivers Advanced Multimodal and Agentic AI Capabilities

Muse Spark 1.1 represents the first major release from Meta Superintelligence Labs and marks a significant upgrade over the original Muse Spark model 3

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. Zuckerberg described the model as "strongest at agentic performance, tool use, and computer use" 1

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. The AI model is now available through Meta's Model API and Meta AI, allowing developers to build with Muse Spark for the first time.

The model is specifically designed to handle coding, reasoning, and agentic tasks with improved multimodal reasoning capabilities 2

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. According to Meta, Muse Spark 1.1 can coordinate multiple AI agents working in parallel, manage long-running tasks, and retain context across extended sessions. The system determines when to automate workflows or interact directly with computer interfaces, positioning it as a versatile tool for developers seeking to build sophisticated AI-powered applications 3

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Meta's Focus on Low-Cost Agentic Models and Market Response

Zuckerberg emphasized Meta's strategic direction in his announcement, stating, "The Meta Model API allows developers to build using Muse Spark for the first time. Our focus is on delivering strong agentic and multimodal models at very low cost. More to come soon" 1

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. This pricing strategy could position Meta competitively against other AI model providers as the market for agentic AI solutions expands.

The release follows this week's launch of Muse Image, indicating Meta's accelerated push into diverse AI capabilities. Meta's stock responded positively to the news, with shares closing Thursday up 4.70% at $631.48 and gaining another 1.25% to $639.36 in after-hours trading 3

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. According to Benzinga Edge Stock Rankings, Meta's stock ranks in the 88th percentile for Growth.

Instagram's Muse AI Feature Raises Privacy Concerns

Meanwhile, popular tech YouTuber MKBHD flagged a separate development involving Instagram's rollout of a new Muse AI feature. The feature automatically opted in everyone with a public account, prompting concerns about user consent and data usage 3

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. MKBHD shared instructions for users to opt out by navigating to their Instagram profile settings under "Sharing and reuse" and disabling the feature for both Posts and Reels. This automatic enrollment approach has drawn criticism from users who prefer explicit consent for AI-related features, highlighting ongoing tensions between rapid AI deployment and user privacy preferences in social media platforms.