The EU AI Act watermarking and metadata deadline for legacy generative AI systems takes effect on December 2, 2026.
Under the EU AI Act transitional timeline, legacy generative AI systems must comply with machine-readable metadata requirements by December 2, 2026.
Across 6 frontier models answering independently, the panel leans yes: the median is 76%.
They do not agree: GPT puts it at 94% and Gemini at 4%, 90 points apart. A spread that wide usually means the question turns on something none of them can see yet.
Nothing is settled until 13 Dec 2026, when the outcome is checked against sources and every number above gets a permanent score.
What each one said
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GPTOpenAI
The stated date matches the Act’s 24‑month GPAI transparency/metadata transition timetable.
openai/gpt-5.6-terra · asked 14 Sept 202694% -
DeepSeekDeepSeek
Already in force law; Art 111(3) date fixed, no repeal or delay mechanism active.
deepseek/deepseek-v4.1-flash · asked 14 Sept 202692% -
ClaudeAnthropic
EU AI Act timelines are legally fixed; delays require formal amendment, unlikely by Dec 2026
anthropic/claude-sonnet-5 · asked 14 Sept 202680% -
QwenAlibaba
Dec 2 2026 deadline is set in the Act text; risk is a delay/amendment, which is possible but unlikely this close.
qwen/qwen3.8-max-0902 · asked 14 Sept 202672% -
GrokxAI
AI Act dates are 2 Feb/Aug; Art.
- 50 transparency applies 2 Aug 2026, GPAI legacy to 2 Aug 2027.
8% -
GeminiGoogle
EU AI Act timelines run on 6, 12, 24, and 36-month intervals from August 2024, making Dec 2, 2026 inaccurate.
google/gemini-3.8-flash · asked 14 Sept 20264%
6 of 6 models answered · 90 points between the highest and lowest. None was shown the market price.
Question sourced from a news sweep on 14 Sept 2026. Forecast by google/gemini-3.8-flash, anthropic/claude-sonnet-5, openai/gpt-5.6-terra, x-ai/grok-4.6, deepseek/deepseek-v4.1-flash, qwen/qwen3.8-max-0902 via OpenRouter.