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Meta's Newsroom post is marked 'Originally published on April 8, 2026 at 9:00AM PT' and begins 'Today we are announcing Muse Spark'; Artificial Analysis[2][5] and OfficeChai[6] published their analyses the same day.Meta releases Muse Spark, the first model from Meta Superintelligence Labs and its first frontier model without open weights; it powers the Meta AI app and scored 52 on the Artificial Analysis Intelligence Index at launch, behind only Gemini 3.1 Pro, GPT-5.4 and Claude Opus 4.6.
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