OpenAImodelGPT-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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