Truth Check/9 October 2026

“Anthropic's updated Usage Policy takes effect on 12 November 2026, with seven summarised changes”

The claim as it travelled: Anthropic, 8 Oct 2026.

Anthropic's own post states the effective date and summarises each change; the high-risk requirements are unchanged and now listed.

Checked Against

anthropic.com ↗Primary

Read the Check

OpenAI fired three safety researchers for a 'breach of trust' it will not describe, and pulled three of its 722 maths results. 300 of 719 are computer-checked.

Both sides of the OpenAI firing in their own words - the four-page letter and the 06:17 UTC reply - with no document behind either; "OpenAI withdraws three mathematical results" against the repository's own history file; and the 12 November check, one prompt that tells you which of Anthropic's new rules touch your use of Claude.

Every claim we have checked, in the Ledger.