The EU AI Act grace period for machine-readable marking of generative AI expires on December 2, 2026.

Question

Six frontier AI models put this at 10% by 1 Dec 2026. Full reasoning from every model.

WillHappen.ai · Accepted Answer

10% — the median of 6 frontier models, resolving by 2026-12-01.

Answer

Gemini (Google): 4% — The EU AI Act ties transitional deadlines to its August 2024 entry into force, leaving no statutory basis for a December 2 expiration. Regulation (EU) 2024/1689 entered into force on August 1, 2024, setting standard 6, 12, 24, and 36-month milestones for August dates. Transparency and marking rules under Article 50 take effect August 2, 2026, with prior models subject to grandfathering or 2027 deadlines. An emergency delay would require an amending legislative act passed by Parliament and Council, which has zero active precedent here.

Answer

Claude (Anthropic): 88% — This hinges on whether the EU keeps the Article 50/Code of Practice timeline fixed without a last-minute delay or amendment. The AI Act's transparency obligations and transitional timelines are set in binding law (Regulation 2024/1689) with a defined Dec 2, 2026 date, not easily changed… EU legislative bodies have shown willingness to adjust AI Act timelines (e.g., GPAI code delays), but changing a dated deadline requires formal amendment, which takes… Resolution date (Dec 1, 2026) is literally one day before the stated expiry, so unless an official amendment already passed, the date stands as written in the Regulation.

Answer

GPT (OpenAI): 4% — The stated deadline falls after the resolution date, and the premise misstates the AI Act’s timing. December 2, 2026 is one day after December 1, 2026, so it cannot literally have expired by the cutoff. Article 50 transparency duties generally apply from August 2, 2026, not via a statutory December 2 grace period for preexisting systems. An EU amendment, Commission implementing act, or corrigendum creating that exact date would sharply raise the odds.

Answer

Grok (xAI): 12% — Whether Art. 50 plus any later act actually sets a 2 Dec 2026 cut-off for pre-August systems. Regulation 2024/1689 Art. 113 makes Chapter IV (incl. Art. 50 marking) apply on 2 Aug 2026 with no extra four-month grace. No delegated or implementing act published by Nov 2026 has inserted a 2 Dec deadline, and none can take effect before resolution. Specific calendar dates in secondary law are rarely invented; the published text is unambiguous so the claim sits well below the base rate of timeline mix-ups.

Answer

DeepSeek (DeepSeek): 88% — The date is fixed in law and no EU body has moved to delay it, so it will almost certainly expire as scheduled. The AI Act's Article 50(2) marking obligation for generative AI applies from August 2, 2026, and the Commission has not proposed delaying it despite industry lobbying. Providers must self-certify compliance; no EU body needs to act before December 2, so the date is unlikely to slip through inaction. The main risk is a last-minute Commission implementing act or Parliament objection, but no such measure is scheduled as of November 2026.

Answer

Qwen (Alibaba): 8% — No provision in the EU AI Act sets a December 2, 2026 deadline for machine-readable marking; the relevant date is August 2, 2026. Article 50 transparency obligations and Article 111(3) both point to August 2, 2026 as the compliance date for marking of generative AI outputs already on the market. The only extended grace period in the Act is the two-year window (to August 2, 2027) for GPAI models placed on the market before August 2, 2025, not a four-month… A December 2 date would require a delegated or implementing act creating a new transitional measure, for which no proposal or draft has surfaced as of late 2025.

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