artificialwatch

← the radar · ✳ model tracker

Muse Spark Open

● live
Metaopen weights

Live — Oct 15; Meta's open-weights Spark: 816B total / 42B active mixture-of-experts with a 1.8B perception encoder, 1M context, text, image, video and audio in, text out; reasoning effort low / medium / high / xhigh, default xhigh; weights on Hugging Face in BF16 and NVFP4, gated, under Meta's Muse Model License; Meta says NVFP4 needs at least 700GB of VRAM and BF16 2TB, and that it is tuned to run on two M5 Ultra Mac Studios with MLX; OpenRouter: $1.25 / $4.25 per 1M through BaseTen (FP4), the same price as Muse Spark 1.3; Meta's own table, against open-weight models: Artificial Analysis Intelligence Index 39, behind GLM 5.3 (45), Kimi K3 (44) and Qwen3.8 (40); ahead of all of them on JobBench (61.8) and MCP-Atlas (89.2); behind on Terminal-Bench 2.1 (76.4 vs Kimi K3's 85.0); Artificial Analysis has no page of its own for it yet (Oct 15). On the board as live since 2026-10-15 — the watchers keep tracking it: lineup changes, pricing moves and deprecations all alert.

No reading from our side yet· checked Live model status →

Watch for Meta’s next model, free →Launch report (PDF)

Timeline

2026-10-15
Muse Spark Open verified live — from the vendor's own announcement and catalog listingverified
2026-10-15
Meta releases Muse Spark Open: 816B open weights at $1.25 / $4.25, and its own table puts it behind Kimi K3 and GLM 5.3post

Meta has released Muse Spark Open, an open-weights version of its Spark model: 816 billion parameters in total, 42 billion active per token, with a 1M-token context. Meta's model card on Hugging Face dates the release October 15.

The official word

We alert on verified API behavior, never on announcements alone — but when Meta speaks, it's here: ai.meta.com/blog ↗

Muse Spark Open: quick answers

Is Muse Spark Open out?

Yes. Muse Spark Open is live and has been since October 15, 2026.

When was Muse Spark Open released?

October 15, 2026.

Who makes Muse Spark Open?

Meta. ArtificialWatch also tracks Muse Wonder, Muse Spark 1.3, Muse Glimmer 30B, Muse Code, Muse Spark 1.2, Muse Spark 1.1, Muse Image and Llama 5 from Meta.

Is Muse Spark Open open weights?

Yes. Muse Spark Open is released with open weights.

More from Meta

Muse Wonderlive since 2026-10-12
Muse Spark 1.3live since 2026-09-02
Muse Glimmer 30Blive since 2026-08-09
Muse Codelive since 2026-08-05
Muse Spark 1.2live since 2026-08-05
Muse Spark 1.1live since 2026-07-09
Muse Imagelive since 2026-07-07
Llama 5watching
sweeping every 60 seconds

Know the minute Meta's next model drops. Free.

A free Chrome push the second it's confirmed on a public API, email about 15 minutes later. Texts or a phone call on paid plans.

  • Free forever
  • No card
  • Unsubscribe in one click

Also: the wire · the bench index · our track record