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GPT-5.5 Instant | OpenAI | Chasing Next

OpenAImodel

May 5, 2026·Source

GPT-5.5 Instant

New default ChatGPT model with fewer hallucinations, shorter responses.

Details

Replaces GPT-5.3 Instant as ChatGPT's default model, rolling out over two days
52.5% fewer hallucinated claims and 37.3% fewer inaccurate claims on flagged conversations vs GPT-5.3 Instant
About 30% fewer words and lines per response, fewer gratuitous emojis

Best for

everyday ChatGPT use where accuracy and concise answers matter

When to use it

fact-sensitive prompts in medicine, law, finance, or any task where ChatGPT used to ramble

Who benefits

all ChatGPT users

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