OpenAI says GPT-5.5 Instant produces 52.5% fewer hallucinated claims "on high-stakes prompts covering areas like medicine, law, and finance" (Megan Morrone/Axios)

Megan Morrone / Axios: OpenAI says GPT-5.5 Instant produces 52.5% fewer hallucinated claims “on high-stakes prompts covering areas like medicine, law, and finance” — - GPT-5.5 Instant is rolling out to all ChatGPT users and to the API. — Enhanced personalization is initially for Plus and Pro on the web.