Anthropic sent letter to US Senate Banking Committee — accuses Alibaba-affiliated operators of largest-distillation-attack-to-date, 28.8M interactions across 25,000 fraudulent accounts
Anthropic sent a letter to the US Senate Committee on Banking, Housing, and Urban Affairs — formally accusing Alibaba-affiliated operators of launching the largest distillation attack to date against Claude. The attack involved 28.8 million interactions between April 22 and June 5, 2026, using approximately 25,000 fraudulent accounts. The Senate-level escalation moves the dispute into formal Congressional record.
The substantive piece is the Senate-level formal escalation with specific scale + duration + attribution. Yesterday's Anthropic Alibaba-specific accusation identified the vendor; today's Senate Banking Committee letter formalizes the accusation into Congressional record with operational specifics — 25,000 fraudulent accounts, 28.8M interactions, April 22 to June 5 window.
The competitive read for the H2 2026 to 2027 US-China AI ecosystem decoupling trajectory is that Senate-level formal escalation creates legislative-and-regulatory follow-up potential beyond vendor-to-vendor dispute. The Senate Banking Committee jurisdiction over financial sanctions could result in commercial-vendor restrictions on Alibaba that extend beyond AI specifically into the broader commercial relationship.
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