https://www.live-feeds.com/feed/meta-stock-falls-as-openai-o-agent-threatens-historic-rallyContinuously updated, source-cited coverage. https://www.live-feeds.com/feed/meta-stock-falls-as-openai-o-agent-threatens-historic-rallyhttps://www.live-feeds.com/feed/meta-stock-falls-as-openai-o-agent-threatens-historic-rally#u101194Mon, 05 Oct 2026 03:36:15 +0000Meta Platforms shares fell 4.2% to $720.36 on Monday as OpenAI prepares to reveal a competing always-on AI assistant. The decline follows a strong September where the stock surged roughly 30%. Investors are weighing the threat of OpenAI's rumored "o" agent against Meta's own Muse agent, questioning if Muse can generate the revenue required to sustain its recent valuation growth. Other reports indicate a broader two-day drop of 8% following the monthly rally.Why it mattersMeta recently launched the Muse AI agent to capture a more profitable segment of the economy. The stock&