Meta released Muse Spark 1.3, an update to its Muse Spark model, with improved performance on agentic and coding tasks. The model is available today in Muse Code and Meta Model API, with max reasoning coming after additional safety testing. Meta also announced plans for a Muse Spark 1.2 open weights release following final safety fine-tuning.

Most coveredModel update

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The Register: “Zuck's Muse to Spark joy with open weights release 'soon'”

Reporting · 7 outlets

Meta· 2 Sept

Introducing Muse Spark 1.3

How it measures

Artificial Analysis · Intelligence Index · Max

48.124thof 696 models

Coding index75.8 · 25th

Median 12.5Top 57.6

Benchmarks, as Artificial Analysis ran them

94%GPQA Diamond
49%Humanity's Last Exam
33%Terminal-Bench 4.0
84%Terminal-Bench 2.1
59%SciCode
51%τ²-Bench Banking
83%Long context reasoning

Speed: 123 tokens/s
First answer: 42.1 s; thinking included
Per 1M tokens: $1.25 in · $4.25 out
Context: 1M tokens

LMArena · Text10thof 416

1Gemini 4 Argon (High)
2Muse Wonder (Max)
3Claude Opus 5.5 (High)
4Claude Fable 5 (High)

Muse Spark 1.3 (Max) · 1,494 (1,489–1,500) · 17,561 votes

Rated by versionMuse SparkLevel with Muse Spark 1.2.

Muse Spark 1.3 · 1,494 (1,489–1,500) · 10th

Against list priceRating for the price

Muse Spark 1.3 · 1,494 · $2.00 per 1M tokens ($1.25 in, $4.25 out) · 1M context

LMArena, CC BY 4.0, 15 October 2026 · prices OpenRouter, list price blended 3:1, read 20 October 2026 · Artificial Analysis, read 20 October 2026

About the model

Lab: Meta
Variant: Muse Spark 1.3 Contributor
Released: 2 September 2026, per models.dev
OpenRouter: Listed 2 September 2026meta/muse-spark-1.3

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