{"slug": "claude-system-prompts", "title": "Claude: System Prompts", "summary": "Anthropic disclosed the system prompts used by Claude's web interface and mobile apps, which provide up-to-date information such as the current date and encourage behaviors like always providing code snippets in Markdown. These prompts are periodically updated to improve responses and do not apply to the Claude API. Starting with the Claude 4.6 generation, each model ID is a single fixed snapshot, so those models have one entry.", "body_md": "We use cookies to deliver and improve our services, analyze site usage, and if you agree, to customize or personalize your experience and market our services to you. You can read our Cookie Policy [here](https://www.anthropic.com/legal/cookies).\n\nClaude's web interface ([claude.ai](https://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](/docs/en/about-claude/models/model-ids-and-versions), so those models have one entry.\n\nWas this page helpful?", "url": "https://wpnews.pro/news/claude-system-prompts", "canonical_source": "https://platform.claude.com/docs/en/release-notes/system-prompts", "published_at": "2026-08-16 12:48:21+00:00", "updated_at": "2026-08-16 13:11:04.535273+00:00", "lang": "en", "topics": ["large-language-models", "ai-products", "ai-tools"], "entities": ["Anthropic", "Claude", "Claude API", "Claude 4.6"], "alternates": {"html": "https://wpnews.pro/news/claude-system-prompts", "markdown": "https://wpnews.pro/news/claude-system-prompts.md", "text": "https://wpnews.pro/news/claude-system-prompts.txt", "jsonld": "https://wpnews.pro/news/claude-system-prompts.jsonld"}}