Muse Spark 1.2

Claims and evidence

• Released 5 August 2026 ● Primary source[1]

• Status Available ● Primary source[2]Available Muse Spark models

• Successor of Muse Spark 1.1 ● Primary source[1]Muse Spark 1.2 [2]Muse Spark

• Change · Training data Meta says it scaled up training compute on coding tasks, with more varied training environments and long-horizon tasks such as whole-repository generation.Compared with Muse Spark 1.1 ● Primary source[1]
• Change · Other Co-trained with the Muse Code agent harness so that it works with that agent's tools, goals, compaction and subagents.Compared with Muse Spark 1.1 ● Primary source[1]
• Change · Other Meta says it follows complex instructions more precisely, helped by training data that Muse Spark 1.1 generated and graded.Compared with Muse Spark 1.1 ● Primary source[1]
• Change · Availability Also offered on a discounted Contributor tier that lets Meta train on customer prompts and completions; Muse Spark 1.1 has no such tier.Compared with Muse Spark 1.1 ● Primary source[2]Available Muse Spark models

• Input text, image, video, audioThe docs also list PDF input. ● Primary source[2]Available Muse Spark models
• Output text ● Primary source[2]Available Muse Spark models
• Feature Reasoning modeReasoning model with adjustable reasoning_effort from minimal to xhigh; reasoning cannot be disabled. ● Primary source[3]How it works
• Feature Tool use ● Primary source[2]Muse Spark
• Context window 1,048,576 tokens tokens ● Primary source[2]Available Muse Spark models
• Parameters Not disclosedNot disclosed by Meta. No claim madeNo source
• Access APIAvailable in the Meta Model API (with expanded global access) and in the Muse Code terminal agent, which runs on that API. ● Primary source[1]Availability

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