Meta Launches Muse Spark 1.3, Its Fourth Model Release in Five Months

AI at Meta ·

Key Info

Meta has released Muse Spark 1.3, its fourth model release in five months, and it is rolling out in Muse Code and the Meta Model API. The max variant is in limited preview for partners and scores 62 on the Artificial Analysis Intelligence Index, behind only Claude Fable 5.1 and Claude Opus 5. The currently available xhigh variant scores 61, tying GPT-5.6 Sol (max) and Grok 4.6 (high).

Highlights

  • Muse Spark 1.3 (max) achieves an AI Index score of 62, placing it third overall.
  • The available Muse Spark 1.3 (xhigh) scores 61, matching GPT-5.6 Sol (max) and Grok 4.6 (high).
  • Gains come primarily from improvements in agentic work and scientific capabilities.
  • Muse Spark 1.3 (max) with deeper reasoning is expected after safety testing is completed.
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