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 updates do not apply to the Claude API. Where a model has multiple dated entries below, updates between versions are bolded. Starting with the Claude 4.6 generation, each model ID is a single fixed snapshot, so those models have one entry.
AI · Technology
Anthropic Updates Claude AI's System Prompts for Enhanced User Interaction
Anthropic has been refining the system prompts for its Claude AI, aiming to provide more current information and guide specific response behaviors in its web and mobile interfaces.
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