Anthropic suspends and restores access to Claude Fable 5 and Claude Mythos 5 in response to export controls; access restored after controls lifted by the U.S. Department of Commerce
Read the original at simonwillison.net→Claude Fable 5 and Claude Mythos 5 were first released on June 9, 2026. On June 12, 2026, Anthropic suspended access to both models to comply with U.S. Department of Commerce export controls; the Department lifted...
Original headline: "Quoting Claude Opus 5 system prompt"
Coverage timeline
- Aug 9, 23:31 UTC Simon Willison lead source Quoting Claude Opus 5 system prompt