Muse Spark 1.3

Claims and evidence

• Released 2 September 2026 ● Primary source[1]

• Status Available ● Primary source[3]Available Muse Spark models

• Successor of Muse Spark 1.2 ● Primary source[3]Muse Spark [1]Coding

• Change · Reasoning Adds a max reasoning effort level beyond xhigh, available on the Standard tier only.Compared with Muse Spark 1.2 ● Primary source[2]Max reasoning [1]second paragraph
• Change · Efficiency Meta says that in comparisons by its engineers it took fewer turns, tool calls and tokens and was less verbose than Muse Spark 1.2 in coding work.Compared with Muse Spark 1.2 ● Primary source[1]Coding
• Change · Other Trained to ask clarifying questions on ambiguous prompts, ask for help when stuck and confirm before consequential actions.Compared with Muse Spark 1.2 ● Primary source[1]
• Change · Modality Audio input is not fully supported and may give degraded responses; the API docs recommend Muse Spark 1.2 for audio.Compared with Muse Spark 1.2 ● Primary source[3]Available Muse Spark models

• Input text, image, video, audioThe docs also list PDF input, and say audio understanding in 1.3 is not fully supported and may give degraded responses. ● Primary source[3]Available Muse Spark models
• Output text ● Primary source[3]Available Muse Spark models
• Feature Reasoning modeReasoning model with adjustable reasoning_effort; adds a max level beyond xhigh on the Standard tier; reasoning cannot be disabled. ● Primary source[2]Max reasoning [1]second paragraph
• Feature Tool use ● Primary source[1]Agentic Workflows
• Context window 1,048,576 tokens tokens ● Primary source[3]Available Muse Spark models
• Parameters Not disclosedNot disclosed by Meta. No claim madeNo source
• Access APIAvailable in the Meta Model API and in the Muse Code terminal agent. ● Primary source[1]Availability

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