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

Last week, OpenAI managed to stop ChatGPT from talking about goblins all the time. This week, there's a whole new model for users to play with.

The company announced in a blog post on Tuesday that ChatGPT 5.5 Instant has begun rolling out to all users as the new default model for the popular AI chatbot. The new model is a follow-up to GPT 5.5, which was released in April.

GPT-5.5 Instant replaces 5.3 Instant, which will remain available for the next three months for paid users but will otherwise be sunsetted.

Unlike Claude Opus 4.7 from Anthropic and GPT-5.5, which are only available to paid customers, GPT-5.5 Instant is "available to everyone." OpenAI says it should produce fewer hallucinations and better overall results for everyday ChatGPT usage.

"This update makes everyday interactions more useful and more enjoyable: stronger and tighter answers across subject areas, a more natural conversational tone, and better use of the context you’ve already shared when personalization can help," OpenAI's blog post said.

According to OpenAI, GPT-5.5 Instant produced 52.5 percent fewer hallucinated claims in internal testing than GPT-5.3 in "high stakes" topics like law, finance, and medicine. In addition, the new model "reduced inaccurate claims by 37.3% on especially challenging conversations users had flagged for factual errors."

The company also says the new model is better at deciding when to use web search for a prompt and analyzing image uploads than before. The new model is also allegedly more concise in its answers, while also maintaining something of a personality in how it talks to the user. GPT-5.5 Instant should also be better at understanding and referencing context from a connected Gmail account and other integrations to provide quality answers.

And, again, most importantly, it should avoid mentioning goblins unless absolutely necessary.

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Disclosure: Ziff Davis, Mashable’s parent company, in April 2025 filed a lawsuit against OpenAI, alleging it infringed Ziff Davis copyrights in training and operating its AI systems.