Meta releases Muse Spark 1.2 and coding agent Muse Code
Meta is launching Muse Spark 1.2 and an early beta of Muse Code, a purpose-built coding agent equipped with a 1 million token context window.

What happened?
Meta has released Muse Spark 1.2 alongside an early beta version of Muse Code, the company's first purpose-built coding agent. The model and agent are designed for long-running software development workflows involving multiple agents and support a 1 million token context window. The launch is reported by Pulse 2.0.
Key facts
| Kontextfönster | 1 miljon tokens |
|---|---|
| Distributionskanaler | Meta Model API, OpenRouter |
| Produktsteg | Tidig beta / Global förhandsvisning |
Why it matters
Muse Spark 1.2 is specifically optimised for refactoring multiple files simultaneously, extended debugging sessions, and continuous development projects that span beyond a single prompt. Furthermore, Muse Code introduces a replayable event log that provides developers with full transparency into every sub-agent, tool call, and interruption, creating a traceable and auditable development process.
Who is affected?
The news primarily concerns software developers, IT architects, and development teams working with large-scale codebases and complex refactoring projects. Companies building upon Meta's AI infrastructure or using OpenRouter and the Meta Model API are also affected by the new tools.
Impact on the EU
The launch is occurring globally in public preview, making Muse Spark 1.2 available to developers and companies within the EU via the Meta Model API and OpenRouter. However, usage within the EU must comply with applicable data protection regulations such as the GDPR, particularly when handling source code and personal data.
What else you should know
Because Muse Code was part of the training process for Muse Spark 1.2, the model has gained an enhanced ability to use tools and plan long-term coding tasks. The system's replayable event logs also allow teams to analyse agent decisions retrospectively.
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