Muse Spark 1.3

Meta AI · Closed weights · Released Sep 2, 2026 · Price not listed

n/aOverall · not enough data

Score by job

Not enough data · 1 of 5 benchmarks

Benchmark	Result	Variant	z
LMArena Coding	1516 rating	muse-spark-1.3-max	1.20

Not enough data · 1 of 4 benchmarks

Benchmark	Result	Variant	z
APEX-Agents	57.8%	muse-spark-1.3_unknown	0.52

Not enough data · 0 of 4 benchmarks

59 · rank 13 · 4 of 5 benchmarks

Benchmark	Result	Variant	z
FrontierMath Tiers 1–3	74.4%	muse-spark-1.3_xhigh	0.44
FrontierMath Tier 4	46.3%	muse-spark-1.3_max	0.22
OTIS Mock AIME	99.2%	muse-spark-1.3_xhigh	0.88
LMArena Math	1489 rating	muse-spark-1.3-max	0.31

68 · rank 12 · 2 of 2 benchmarks

Benchmark	Result	Variant	z
LMArena Creative Writing	1452 rating	muse-spark-1.3-max	0.04
LMArena Instruction Following	1479 rating	muse-spark-1.3-max	0.55

64 · rank 7 · 1 of 1 benchmarks

Benchmark	Result	Variant	z
LMArena WebDev	1658 rating	muse-spark-1.3-max	0.99