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OpenAI rolls out GPT 5.5 Instant replacing GPT 3.5 Instant as ChatGPT default
Technology
Published on 5 May 2026
ChatGPT’s default model quietly gets faster and smarter
OpenAI has introduced GPT-5.5 Instant, replacing GPT-3.5 Instant as the default model in ChatGPT. The update signals a shift to a newer “instant” experience aimed at quicker, more capable responses for everyday prompts. For most users, the change is likely seamless, with ChatGPT automatically routing requests to the new default model.
- GPT-5.5 Instant replaces GPT-3.5 Instant as ChatGPT default
- The update targets an improved instant response experience
- Most users will see the change automatically without switching models
- It marks another step in OpenAI’s rapid model iteration cycle
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This summarization was done by Beige for a story published on 
TechCrunch