System Prompts – Claude API Docs (opens in new tab)

# System Prompts See updates to the core system prompts on claude.ai and the Claude iOS app and Claude Android app. --- Claude's web interface (claude.ai) and mobile apps use a system prompt to provide up-to-date information, such as the current date, to Claude at the start of every conversation. The system prompt also encourages certain behaviors, such as always providing code snippets in Markdown. This prompt is periodically updated to improve Claude's responses. These system prompt upda...