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Your System Prompt Has a Shelf Life: Maintaining Prompts as Models Improve

This story is from 2026-09-02. It is preserved in the archive; the latest stories are on the live feed.

Anthropic removed over 80% of Claude Code's system prompt for Claude Opus 5 and Claude Fable 5, and measured no loss on their coding evaluations. Those instructions were not wrong when they were written. They were load-bearing. Somewhere between the model they were written for and the model running…

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  1. 2026-09-02 16:07 · DEV Community — AI
    Your System Prompt Has a Shelf Life: Maintaining Prompts as Models Improve

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