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ToolsThe story, in brief

OpenAI says old prompts are holding GPT-5.5 back and developers need a fresh baseline

GPT-5.5 breaks your old prompts. Here's what developers need to rewrite.

Reporting by The Decoder 1 min brief
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The KeyNews take

Why it matters

OpenAI is signaling a significant shift in how GPT-5.5 handles prompting strategy—old patterns won't transfer, forcing developers to rebuild their prompt frameworks from scratch. This has immediate implications for production systems and engineering velocity.

The key facts

4 to know

  1. GPT-5.5 requires fresh prompts; legacy prompts no longer optimal

  2. Minimal starting baseline recommended

  3. Role definitions re-elevated as critical framework component

  4. Breaks backward compatibility with GPT-5 prompt patterns

Go to the source

The Decoderthe-decoder.com

Publisher excerpt: OpenAI says developers shouldn't carry over old prompts for GPT-5.5. Instead, start minimal and from scratch. Role definitions, which some had written off as unnecessary, are back at the front of the framework.
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