GPT-5.5 is in the API. Don't just bump the version string.

📰 Dev.to · Andrew Kew

GPT-5.5 landed in the OpenAI API this week. OpenAI's own docs warn you not to treat it as a drop-in for gpt-5.4. Here's what actually changed and what that means for your prompts and agents.

Published 25 Apr 2026
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