Story
Changes in the system prompt between Claude Opus 4.6 and 4.7
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Overview
Anthropic has updated the system prompt for Claude Opus 4.7, released on April 16, 2026, following the previous version 4.6 from February 5, 2026. The system prompt archive for Claude models dates back to Claude 3, released in July 2024.
Summary from simonwillison.net.
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Community reactions
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Hacker News · simonwillison.net
Hacker News discussion ↗
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Based on 5 sampled comments from this thread. Analyzed 2026-04-19.
- Praise: The ability to update system prompts post-release allows for flexibility in addressing emerging issues, which can enhance model safety and responsiveness.
- Praise: The new <acting_vs_clarifying> section aims to improve user interactions by encouraging the model to seek clarification, potentially leading to more accurate outputs.
- Concern: The reliance on extensive system prompts, exceeding 60,000 words, raises concerns about efficiency and security, as it could lead to increased infrastructure costs without improving model performance.
- Concern: The model's heightened caution against enabling malware development has resulted in significant usability issues, causing companies to block its use due to unaligned behavior.