AI BriefingClaude System Prompt Change History
Key point
Explains how system prompts are updated in the Claude web and mobile apps and how they differ from the API.
Details
The Claude web interface (claude.ai) and mobile apps use a System Prompt to control specific behaviors, such as providing the current date at the start of a conversation and utilizing Markdown code snippets.
This prompt is periodically updated to improve response quality, but the key point is that it does not apply to the Claude API.
Additionally, it provides the change history of system prompts for each model, and starting from the Claude 4.6 generation, each model ID is managed as a single fixed snapshot.
This summary was generated automatically by AI. Check the original for the author's claims and context. Copyright belongs to the original author.
Our guide explains how the AI works. Report summary errors, attribution issues, or removal requests via Contact.
Related
US Appeals Court Upholds Pentagon Blacklisting of Anthropic as Supply Chain Risk