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Muse Spark 1.3

MetaProprietaryPending Human Review

Muse Spark 1.3 is a proprietary Meta multimodal reasoning model for coding and agentic knowledge work. The 1.3 update improves long instruction adherence, multi-task coordination, self-awareness of task limits, and cooperation with users during extended work. It accepts text, images, video, and audio and produces text; the API specifies a 1,048,576-token context for these versions. Standard and, where offered, Contributor access use the same model capabilities but different data-use terms. Contributor access is a serving tier rather than a separate model. Future open-weight plans are not a weight release.

2026-09-02
Undisclosed
Proprietary

Specifications

Architecture
Undisclosed
License
Proprietary
Context Window
1,048,576 tokens
Type
multimodal
Modalities
textimagevideoaudio

Benchmark Scores

Advanced Specifications

Model Family
Muse Spark
API Access
Available
Chat Interface
Not Available
Variants
StandardContributor

Capabilities & Limitations

Capabilities
codingreasoningmultimodal understandingtool uselong-running agents
Known Limitations
Weights are not publicly availableAudio understanding is not fully supported in 1.3; use 1.2 for audio
Notable Use Cases
software engineeringmultimodal agentsdocument and video analysis
Tool Use Support
Yes

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