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The EU Artificial Intelligence Act (Regulation 2024/1689) enters its most operationally demanding phase on August 2, 2026, when high-risk AI system obligations become mandatory. Providers of high-risk AI systems must comply with requirements including risk assessments, transparency obligations, human oversight, and data governance. Penalties for non-compliance reach up to €35 million or 7% of global revenue. Meanwhile, California has enacted SB 53, the Transparency in Frontier Artificial Intelligence Act, applying to companies with over $500 million annual gross revenue and defining frontier models as those trained with over 10^26 FLOPS. This marks a significant convergence of EU and US state-level AI governance approaches, with both frameworks targeting frontier AI models and high-risk systems. EU Artificial Intelligence Act Implementation Timeline reported the core details. Legiscope - EU AI Act Timeline noted additional context. Compliquest - EU AI Act 2026 Requirements Guide added corroborating details.