Provenance Marks on Model Output
Frontier vendors will keep extending default, invisible provenance marks across their model lines, and each rollout will produce removal tools and a dispute over who may run the detectors.
forming · confidence 40 · Emerging (watchlist) · tracking since November 1, 2026 · updated November 1, 2026
Why the conviction moved
- Nov 1Strengthened +4
Anthropic will add its hidden text watermark to Mythos 5, Opus 4.7, Opus 4.6 and Sonnet 4.6 on November 3. On the two 4.6 models the mark applies only at default sampling settings, so changing one parameter removes it. This is the thesis in action: default marking spreads across a whole model line, and a built-in way to remove it ships at the same time.
Source trail
Supporting · November 1, 2026
Anthropic adds its hidden text watermark to Mythos 5, Opus 4.7, Opus 4.6 and Sonnet 4.6 on November 3
Anthropic will add its hidden text watermark to Mythos 5, Opus 4.7, Opus 4.6 and Sonnet 4.6 on November 3. On the two 4.6 models the mark applies only at default sampling settings, so changing one parameter removes it. This is the thesis in action: default marking spreads across a whole model line, and a built-in way to remove it ships at the same time.
AI Post
Unlock full source trail, score history, and daily updates.
Unlock TrendsAffected regions & assets
Townsquare
Argue the thesis in Townsquare.