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The EU AI Act (Regulation 2024/1689) enters its most significant enforcement phase on August 2, 2026, when high-risk AI system obligations become enforceable. GPAI model provider obligations (Articles 53-55) have been in effect since August 2, 2025, requiring providers of models like GPT-4, Claude, and Gemini to comply with transparency, documentation, and copyright obligations. The August 2026 deadline marks the transition from preparation to enforcement for high-risk AI systems across 8 categories defined in Annex III. Non-compliance carries penalties up to €35 million or 7% of global annual turnover under Article 99. The European AI Office is the primary enforcement body, and the 2025 GPAI Code of Practice establishes the compliance framework. European Commission Digital Strategy reported the core details. Legiscope noted additional context. Medialaws.eu added corroborating details.