GPT-5.5 Instant: smarter, clearer, and more personalized

Update on June 9, 2026: Personalization improvements are now rolling out to ChatGPT Go & Free. Responses on the Free tier will draw from a reduced set of past chats.

We’re updating ChatGPT’s default model, available to everyone, to be smarter and more accurate, with clearer, more concise answers that feel better tailored to you.

Because Instant is the daily driver for hundreds of millions of people, small improvements make a big difference. 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.

Smarter, more accurate answers with less to sort through

Instant is now more dependable, with significant improvements in factuality across the board and the largest gains in domains where accuracy matters most. In internal evaluations, GPT‑5.5 Instant produced 52.5% fewer hallucinated claims than GPT‑5.3 Instant on high-stakes prompts covering areas like medicine, law, and finance. It also reduced inaccurate claims by 37.3% on especially challenging conversations users had flagged for factual errors.

GPT‑5.5 Instant is a generally smarter model that’s more capable across everyday tasks, including improvements in analyzing photo and image uploads, answering STEM-related questions, and deciding when to use web search to provide a more useful answer.

These improvements are reflected in gains on evaluations across visual reasoning, math, and science:

More personalized responses and controls

We’re also introducing memory sources across all ChatGPT models, which give you visibility over what context was used to personalize responses with new controls. When a response is personalized, you can see what context was used, such as saved memories or past chats, and delete or correct it if something is outdated or no longer relevant.