References 488% CONFIDENCEOverall confidence: 88%How well the pin's source and references back up its dates.Weighted average of how firmly 4 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better

The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.

• [1]90%
  research.meta.ai/blog/introducing-muse-spark-1-3

  research.meta.ai· Posted Sep 28, 2026· Starts Sep 2, 2026 ✓· 26% of score

  Meta's^[2] post is dated "September 2, 2026" and says "We're excited to release Muse Spark 1.3" and that it "is available today in Muse Code and in Meta Model API"; Artificial Analysis^[4]' write-up of the same day opens "Meta has released Muse Spark 1.3".

• [2]90%
  Muse Spark 1.3 | Meta

  developer.meta.com· Added Sep 28, 2026· 26% of score

  Meta's^[1] developer model page lists the two API models and their prices - muse-spark-1.3 at $1.25 input, $0.15 cached input and $4.25 output per million tokens, and muse-spark-1.3-contributor at $0.10 and $0.20 with data used to improve Meta's products - both with a 1M-token context window.

• [3]80%
  Meta says Muse Spark 1.3 has frontier performance - but its best results come from a model developers can't broadly use yet

  venturebeat.com· Published Sep 3, 2026· 24% of score

  VentureBeat's report by Carl Franzen says the xhigh version is broadly available through Muse Code and Meta^[1][2] Model API while the max configuration is undergoing safety testing and will arrive shortly, and notes the open-weights release now on Meta's roadmap.

• [4]90%
  Muse Spark 1.3: Meta reaches the frontier

  artificialanalysis.ai· Published Sep 2, 2026· Starts Sep 2, 2026· 24% of score

  Artificial Analysis' same-day independent benchmark write-up: Muse Spark 1.3 (xhigh) scores 61 on its Intelligence Index, up from 57 for 1.2 and 53 for 1.1, and the limited-preview max variant 62, behind only Claude Fable 5.1 and Claude Opus 5; it gives the Tau3-Bench Banking, Terminal-Bench 2.1, GDPval-AA v2 and cost-per-task figures.

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