Metaopen weightsCurrentReasoning

Muse Spark Open

Name: Muse Spark Open
Author: Meta

Open-weights release of Muse Spark (816B MoE, 42B active, text/image/video/audio in); effort low to xhigh. No Meta API: Together, Fireworks, Baseten and OpenRouter serve it at $1.25/$4.25. Licence requires 'Built with Muse Spark Open' attribution and a separate agreement above $20M/yr revenue. Meta reports Terminal-Bench 2.1 76.4 (Terminus 2, xhigh), HLE-Diamond 26.1 no tools, DeepSWE 1.1 60.

Released

Oct 15, 2026

Price in / out

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Blended $/1M

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Context

Parameters: 816B / 42B active. License: Muse Model License.

Benchmark scoresvs Muse Wonder Full

Benchmark	Score	Δ vs prior	Rank (current)	Configuration	Source
GPQA Diamond	89%	—	#13 of 22	Artificial Analysis run, xhigh effort · independent run	artificialanalysis.ai ↗
Humanity's Last Exam	43.9%	-9.7	#16 of 36	Artificial Analysis run, no tools (2,158 text-only questions), xhigh effort · independent run	artificialanalysis.ai ↗
ARC-AGI-2	57.5%	—	#13 of 14	ARC Prize semi-private, xhigh reasoning (snapshot 2026-10-28) · leaderboard	benchlm.ai ↗
Artificial Analysis Intelligence Index	25	-25.0	#25 of 33	Artificial Analysis Intelligence Index v5, xhigh effort · independent run	artificialanalysis.ai ↗

Version

$ in / out

Terminal-Bench

SWE-bench

GPQA

HLE

ARC-AGI-2

AIME

Muse SparkSuperseded

—

77.4%

89.5%

50.4%

42.5%

—

Muse Spark 1.1Superseded

$1.25 / $4.25

69.3%

—

62.1%

—

Muse Spark 1.2Superseded

$1.25 / $4.25

69.7%

—

Muse Glimmer 30B

—

76%

83.5%

22%

—

94.7%

Muse Spark 1.3

$1.25 / $4.25

79%

—

93.5%

48.7%

—

Muse Wonder

$4 / $20

—

50.1%

—

Muse Wonder Full

—

53.6%

—

Muse Spark Open

—

89%

43.9%

57.5%

—

Muse Spark Open

Benchmark scoresvs Muse Wonder Full

Muse versions

Compare

Shipping with it?

Current open-weight peers

Version	Released	$ in / out	Terminal-Bench	SWE-bench	GPQA	HLE	ARC-AGI-2	AIME
Muse SparkSuperseded	2026-04-08	—	—	77.4%	89.5%	50.4%	42.5%	—
Muse Spark 1.1Superseded	2026-07-09	$1.25 / $4.25	69.3%	—	—	62.1%	—	—
Muse Spark 1.2Superseded	2026-08-05	$1.25 / $4.25	69.7%	—	—	—	—	—
Muse Glimmer 30B	2026-08-09	—	—	76%	83.5%	22%	—	94.7%
Muse Spark 1.3	2026-09-02	$1.25 / $4.25	79%	—	93.5%	48.7%	—	—
Muse Wonder	2026-10-12	$4 / $20	—	—	—	50.1%	—	—
Muse Wonder Full	2026-10-12	—	—	—	—	53.6%	—	—
Muse Spark Open	2026-10-15	—	—	—	89%	43.9%	57.5%	—