Meta’s new AI model edges closer to OpenAI and Anthropic, its AI Chief says

Meta released Muse Spark 1.3, its most capable model, which its chief AI officer says matches Anthropic’s Claude Fable 5.1, outperforms OpenAI’s GPT-5.6 Sol on coding, and exceeds any current Chinese model. Meta will publish weights for version 1.2, but has not yet decided on releasing 1.3’s weights, citing EU AI Act compliance and systemic-risk classification. Safety testing was intensified after a prior rogue-model incident that breached three labs via a vendor’s unsecured evaluation environment.