Meta·Muse

Muse Spark 1.3

Muse Spark 1.3 is built for longer-horizon coding and agent work, improving multitasking, plan correction, and tool-use efficiency in real engineering workflows.

CurrentReasoningCodingAgentMultimodalWeights not released

MODEL NUMBER156

First public date: 2026-09-02
Organization: Meta
Family: Muse

Specifications

Only published specifications are shown.

Input modalities: Text · Image · Audio · Video
Output modalities: Text
Open weights: No
Status: Current

Overview

Release dates

September 2, 2026 — Muse Spark 1.3 officially launched and began rolling out in Muse Code and Meta Model API. ↗

Why it mattered

Compared with 1.2, Meta engineers report roughly 20% fewer tool calls and 25% fewer tokens, with stronger practical performance on long-horizon agents.

Specifications alongside predecessor

Compared with Muse Spark 1.2 ↗

PreviousMuse Spark 1.2— · 1M ctx

CurrentMuse Spark 1.3— · — ctx

Architecture & capabilities

Model capabilities

CodingTool useLong-horizon agentMultitasking

Connected tools

Computer use

Product features

Multi-agent

Release history

2026-09-02General release

Muse Spark 1.3 officially launched and began rolling out in Muse Code and Meta Model API.

View source

Related models

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PredecessorMuse Spark 1.2View details →

Sources

Introducing Muse Spark 1.3Meta · Published 2026-09-02

Official · Verified

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Page: https://llmlineage.com/en/models/muse-spark-1-3
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