The EU AI Act's legacy synthetic content marking requirements take effect on December 2, 2026.

Question

Six frontier AI models put this at 85% by 12 Dec 2026. Full reasoning from every model.

WillHappen.ai · Accepted Answer

85% — the median of 6 frontier models, resolving by 2026-12-12.

Answer

Gemini (Google): 88% — The statutory timeline is already codified in EU law and requires an unlikely emergency legislative amendment to derail. Under the EU AI Act published in July 2024, transparency obligations for synthetic content take effect automatically on schedule. Delaying an established implementation date requires full ordinary legislative procedure involving the European Parliament and Council. A formal proposal from the European Commission to postpone implementation before late 2026 would be the only trigger to lower this.

Answer

Claude (Anthropic): 82% — Turns on whether the EU grants a last-minute delay or simplification amid ongoing Digital Omnibus deregulation talks. Article 50 transparency obligations are already legally set for Dec 2, 2026, and no formal repeal has passed yet as of Nov 2026. The EU's Digital Omnibus package has proposed simplifying/delaying some AI Act provisions, creating real but unresolved risk of postponement. Legislative change this close to deadline is historically rare without finalized trilogue agreement, which hasn't happened yet.

Answer

GPT (OpenAI): 97% — This is a fixed application date in the AI Act, and no enacted EU delay is presently indicated. Article 50 transparency duties, including machine-readable marking of synthetic content, apply from 2 August 2026. The stated 2 December date appears to misdate the Act’s schedule, but the obligations should already be operative by then. Only an EU legislative amendment or a court-suspended application before December would materially change this.

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Grok (xAI): 8% — Whether Art. 50 marking rules are scheduled for 2 Dec 2026 rather than the Act’s 2 Aug 2026 date. The AI Act (Art. 113) applies Chapter IV transparency duties, including synthetic-content marking, from 2 August 2026. No co-legislator or Commission act has postponed that date; 2 Dec would require an unadopted amendment. A last-minute delay this close to the original date has no precedent and would be the only thing that could make the claim true.

Answer

DeepSeek (DeepSeek): 92% — The date is already fixed in law; only a formal postponement before December 2 could stop it. Article 113 sets 2 August 2026 as general application, with Article 50 transparency duties for legacy systems landing 2 December 2026 — a date already in the Official… The Commission would need to propose and both co-legislators adopt a delay in under three weeks; no such proposal exists and the AI Act has no built-in slippage clause. Precedent: the EU has never retroactively postponed a transparency deadline this close to entry, and the watered-down 'digital omnibus' talk targets high-risk rules, not…

Answer

Qwen (Alibaba): 9% — The AI Act's Article 50 transparency obligations apply from August 2, 2026, not December 2, 2026. The EU AI Act's phased timeline sets 24 months post-entry-into-force (Aug 2, 2026) for most provisions including Article 50 synthetic content marking. No 28-month milestone exists in the Act's structure; deadlines fall at 6, 12, 24, and 36 months from the August 1, 2024 entry into force. A targeted delay or amendment shifting this specific obligation to December 2 would require a legislative act with no known basis as of now.

The EU AI Act's legacy synthetic content marking requirements take effect on December 2, 2026.

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