PendingMusk promised (Sep 19, 2025) 'the algorithm will be purely AI by November.' November passed with the main feed still on the legacy stack (in late October he was still promising to remove heuristics 'within 4-6 weeks'). But the promised thing shipped about seven weeks late: on Jan 20, 2026 X released its new production For You algorithm — live on the platform and open-sourced — which 'relies entirely' on a Grok-based transformer, with all hand-engineered ranking features removed. Delivered-late: purely-AI ranking arrived, just not by November. TechCrunch — X's new Grok-powered For You algorithm, Jan 20 2026 ↗
The X feed was not 'purely AI' by November 2025; Musk publicly apologized for algorithm issues in late Oct 2025, and the confirmed Grok-powered feed came months later (Jan-Mar 2026).
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