OpenAI rolls out ChatGPT 5.5 Instant as the new default model for everyone

OpenAI is rolling out ChatGPT 5.5 Instant as the default model for all ChatGPT users.

It replaces GPT-5.3 Instant, which will stay available for a while to paid subscribers.

OpenAI says the new model is more accurate, more concise, and better at using context and integrations.

The company also says it should hallucinate less, improving everyday answer quality for more users.