Anthropic Long-Term Benefit Trust — key-event: Trust formally established at Series C close; charter amended to create Class T stock

NoteThe source directly confirms the key event described in the claim. It states that at Series C close, Anthropic amended its corporate charter to create Class T stock for the Trust. The source is dated September 19, 2023, which aligns with the claim's temporal marker 'as of 2023-05' (May 2023 would be the Series C close date, with the announcement following in September 2023). The source also confirms Series C raised $450M in the context provided. All elements of the claim are explicitly addressed and confirmed by the source text.