Shares of Meta Platforms Inc. climbed Tuesday, extending gains from the previous session after Chief Executive Mark Zuckerberg unveiled a major shift back toward open-source artificial intelligence, positioning the company more directly against rivals OpenAI and Anthropic.

The stock traded at $609.05 as of 10:25 a.m. Eastern time, up $14.13, or 2.38%. The gain builds on Monday's session, when shares rose nearly 3% in premarket trading following Meta's announcement, even as the stock remains down roughly 10% for the year amid ongoing investor questions about the payoff from the company's massive artificial intelligence spending.

In an Instagram video posted Monday, Zuckerberg announced that Meta would release the weights for its newest and most capable AI model, Muse Spark 1.2, meaning developers and the public will be able to download and use the underlying technology directly rather than accessing it only through Meta's own products. Alongside that announcement, Meta launched Muse Glimmer, a new family of smaller, open-source models specifically designed to run on laptops and other consumer devices rather than relying entirely on cloud-based data centers.

Muse Glimmer is a 30-billion-parameter model distilled from the larger Muse Spark 1.2, according to Bloomberg, with Meta transferring reasoning capabilities from the flagship model and adding a lightweight companion model to speed up text generation. The model is being released under an Apache 2.0 license, allowing developers to download and modify it freely,........

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