Simon Willison 8/9/2026

Quoting Claude Opus 5 system prompt

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This article discusses the system prompt for Claude Opus 5, which includes a notice about the temporary suspension and restoration of access to Claude Fable 5 and Claude Mythos 5 due to U.S. Department of Commerce export controls. The prompt instructs Claude to confirm these events accurately, avoid personal opinions, and direct users to Anthropic's official statement for further details. It also mentions checking for newer information when possible. This is relevant to AI technology and model deployment.

Quoting Claude Opus 5 system prompt

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