Meta's Muse Spark 1.3 Reviewed: Capable Code Model Held Back by Rough Tooling

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A developer has shared a hands-on review of Muse Spark 1.3, Meta's latest frontier-level language model offered through its Muse LLM harness for developers. On the negative side, the model struggles with consistent skill-following, sometimes stalling mid-workflow and requiring manual prompts to continue, while also producing inconsistent markdown output. The sandbox environment was flagged as overly restrictive, blocking external ports and files outside the workspace, with no option to configure exceptions. Despite these drawbacks, the reviewer praised the model's general coding intelligence as comparable to other leading frontier models, noting its output is more readable than some competitors. Pricing was highlighted as a strong point, with the $15 plan offering roughly 2–4 hours of continuous coding before hitting a 5-hour limit, making it competitive in value against similar subscriptions.

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