Meta's next model "Muse Spark 1.4" may be running internally, leak says; name reportedly in a GitHub PR, no official announcement confirmed

Leaker posts that 1.4's name is in a Meta PR

A leak posted on Nov. 13 (12:46:15 a.m. Nov. 14 Japan time) by @LuminaBench, an X account that tracks AI models, said the name "Muse-Spark-1.4-internal," apparently Meta's next model, appeared in one of the company's code change proposals, or pull requests (PRs). The post said there is also a record of an actual call using the model, and it attached one image. The text of the post did not include the URL of the original PR, and ORIENS could not check the PR itself. Meta has not announced version 1.4.

TestingCatalog believes it is "already used internally"

About 18 minutes later, at 1:04:38 a.m. Nov. 14 Japan time, TestingCatalog, an X account that publishes AI news, quoted @LuminaBench's post and reported that "Muse-Spark-1.4-internal" had been spotted in one of the PRs on GitHub. According to the account, the PR is a small logging change to the experimental "live tuning" feature of "RocksDB," and the name appeared in PR notes that seem to have been generated automatically. TestingCatalog believes Muse Spark 1.4 is in development and appears to be already used inside Meta.

TestingCatalog also did not give the URL of the PR. In a search ORIENS ran on Nov. 14, no public PR containing the name was found. The internal use is a view based on the leak, and Meta has not confirmed it.

Spark 1.3 is the latest official version

The latest Muse Spark that Meta has announced on its official blog is "Muse Spark 1.3," dated Sept. 2. Meta described 1.3 as a version with its deepest reasoning setting for challenging reasoning and agent tasks, in which the AI carries out work on its own, and with improved real-world usability.

In its Nov. 9 announcement of the small model "Muse Ember," the higher-end Spark that Meta compared it with was also version 1.3. In that announcement, Meta divided roles among "Muse Wonder" for the hardest problems, "Muse Spark" for coding and agent work, and "Muse Ember" for handling repeatable tasks at scale.

Within what ORIENS checked on Nov. 14, Meta has not mentioned 1.4 on its official blog or its official X accounts. No official document showing the performance, release timing or pricing of 1.4 was found.