Anthropic updates Claude system prompts, excluding API users

Anthropic is updating the system prompts for its Claude models, which are used in its web interface and mobile applications. These updates aim to provide more current information, such as the date, and to encourage specific behaviors like using Markdown for code snippets. Importantly, these system prompt changes are not applied to the Claude API, meaning API users will not see the same behavioral updates. AI

IMPACT System prompt updates may improve user experience and consistency for claude.ai and mobile app users, but do not affect API behavior.

RANK_REASON The item describes updates to system prompts for Anthropic's Claude models in their consumer-facing applications, not a new model release or core research.

Read on HN — claude cli stories →

• Claude
• Claude API
• Claude Fable 5
• Claude Haiku 3
• Claude Haiku 3.5
• Claude Haiku 4.5
• Claude Opus 3
• Claude Opus 4
• Claude Opus 4.1
• Claude Opus 4.5
• Claude Opus 4.6
• Claude Opus 4.7
• Claude Opus 4.8
• Claude Opus 5
• Claude Sonnet 3.5
• Claude Sonnet 3.7
• Claude Sonnet 4
• Claude Sonnet 4.5
• Claude Sonnet 4.6

• product

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →