GPT-5.5 Instant: ChatGPT Gets More Accurate, Concise, and Emoji-Free

Since May 5, 2026, ChatGPT runs on GPT-5.5 Instant by default — the new base model for all users. You don't need to change anything, the update is automatically active. And the improvements are not subtle this time — they are immediately noticeable.

The key changes at a glance:

- 52.5% fewer hallucinations on high-risk topics like medicine, law, and finance
- 37.3% fewer factual errors in conversations previously flagged by users as inaccurate
- ~30% shorter responses — more concise, less filler text
- No more gratuitous emojis — OpenAI deliberately dialed back excessive emoji usage

What this means in practice:

If you use ChatGPT for research, you now get more reliable answers. The hallucination reduction is especially relevant for fact-intensive tasks: summarizing technical literature, initial legal assessments, or medical information. Important: Still verify facts — 52% fewer is not zero.

The shorter responses solve a problem that annoyed many users: ChatGPT tended to answer simple questions with three paragraphs where one sentence would have sufficed. This is noticeably better now.

New for Plus/Pro users — Memory Sources:

ChatGPT now shows which personal information influenced a response. If you have past chats, saved files, or connected services (e.g., Gmail), you can now see which memory entries were used under each answer — and correct or delete them.

How to get the most out of it:
- Fact-checking: Use the higher precision for initial research, but continue to verify critical information
- Productivity: Shorter answers save reading time — especially when asking many questions in a row
- Check your memory: Go to Settings > Personalization > Memory and review what ChatGPT has stored about you. Delete outdated or incorrect entries

Privacy note:
The Memory Sources feature reveals how much context ChatGPT uses about you. This is transparent — but regularly check whether you are comfortable with the stored information. Under Settings > Personalization you can disable Memory entirely.

Bottom line: A solid update that noticeably improves everyday usage. Not a revolution, but exactly the kind of improvement that counts: fewer errors, less fluff, more substance.

Sources: techcrunch.com/2026/05/05/openai-releases-gpt-5-5-instant, the-decoder.com/chatgpt-update-rolls-out-gpt-5-5-instant