GPT-5.5 Instant delivers powerful ChatGPT upgrade (opens original article in a new tab)

OpenAI has launched GPT-5.5 Instant as the default model for ChatGPT, featuring improved accuracy and natural conversation capabilities, alongside a new AI chip called Jalapeño to enhance performance and reduce costs.

• GPT-5.5 Instant is now the default model for ChatGPT, replacing GPT-5.3 Instant in May 2026
• GPT-5.5 Instant reduces hallucinated claims by 52.5% and incorrect answers by over a third on high-stakes topics
• OpenAI introduced Jalapeño, a custom AI inference chip developed with Broadcom to improve efficiency of large language models