It has been a big week for Meta in the AI sphere, formally launching its Muse Code coding agent out of beta with a triumvirate of new subscription plans. Then late on Wednesday, the company unveiled Muse Spark 1.3, the latest version of its low-cost reasoning model, with Meta claiming its biggest gains yet in coding and agentic tasks.

Available through Muse Code and the Meta Model API, Muse Spark 1.3 is the latest iteration of the reasoning model Meta first introduced in April, and arrives less than a month after the release of Muse Spark 1.2. Meta CEO Mark Zuckerberg took to social media to hype the new release, describing it as delivering “frontier performance almost too cheap to meter.”

“This is the biggest jump we’ve made so far on coding and agentic work.”

“This is the biggest jump we’ve made so far on coding and agentic work,” Zuckerberg writes on X.

Zuckerberg also confirmed that the open-weight releases of Muse Spark will be “coming soon,” a move that could let developers download and run the model on their own infrastructure, bypassing Meta’s hosted API.

Exactly how permissive that will be, however, isn’t clear, as Meta has yet to publish the licence terms that will accompany the release. Its previous open-weight models have carried varying restrictions on use, so those details will determine how freely Spark can be modified, redistributed or deployed.

Notably, Zuckerberg also teased Meta’s much-hyped next model, codenamed Watermelon, using the somewhat apt watermelon emoji.

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