Summary
- Meta's official X account, AI at Meta, unveiled the beta of Muse Code, a coding agent that runs in the terminal.
- Muse Code is powered by the newly announced Muse Spark 1.2 model and is aimed at long-horizon software engineering, the company said.
- It was introduced as a system that plans, implements, and validates changes across multiple files in large repositories, using persistent sub-agents.
A coding agent that runs in the terminal
On August 5, 2026 (UTC), Meta's official X account, AI at Meta, unveiled the beta of Muse Code, a terminal-based coding agent. Meta said the agent was designed for "long-horizon software engineering" (AI at Meta). In other words, rather than generating code in a single round of question and answer, it is aimed at development tasks that require multiple steps to complete.
Powered by the new model Muse Spark 1.2
Muse Code is powered by Muse Spark 1.2, a new model that Meta announced alongside it. Details such as the model's parameter size, training data, and benchmark scores were not disclosed in the post. The scope of the release, available regions, and access conditions were also not confirmed.
Multi-file changes and persistent sub-agents
Meta said Muse Code plans, implements, and validates complex multi-file changes across large repositories. It was also described as having persistent sub-agents that divide up the work. However, the original post's text appears to be cut off after the link, so what specific problems the sub-agents solve was not confirmed.
| Item | Confirmed detail |
|---|---|
| Product | Muse Code (beta) |
| Runtime environment | Terminal |
| Underlying model | Muse Spark 1.2 (new) |
| Scope of work | Multi-file changes across large repositories |
| Processing stages | Plan → Implement → Validate |
| Architectural feature | Persistent sub-agents |
| Pricing / release scope | Not disclosed |
Other examples of terminal-based coding agents and how they handle long-horizon tasks can be found in METAL LAB's collection of coding agent articles.
What remains unconfirmed
This announcement is based on a single X post, and no other cross-checkable coverage has been confirmed yet. Benchmark figures, comparisons with existing coding agents, the beta sign-up process, and supported languages and runtimes were not included in the original post. Detailed specifications are expected to be confirmed when Meta releases follow-up documentation or a technical blog post.
Comments