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

Note: The claim makes three specific assertions: (1) Trust formally established at Series C close, (2) charter amended to create Class T stock, and (3) timing as of 2023-05. The source text discusses the LTBT announcement on September 19, 2023, but does not provide the specific details claimed—namely, the formal establishment date relative to Series C, the Class T stock creation, or confirmation of a May 2023 timing. The source only states the Trust 'has been developing since the birth of Anthropic' without pinpointing establishment to Series C close. The additional context about Series C raising $450M is not addressed in the source excerpt. Without explicit confirmation of these specific events and dates, the claim cannot be verified from this source.