GPT-5.5 Instant: The New ChatGPT Default Model Complete Guide 2026

GPT-5.5 Instant replaced GPT-5.3 Instant as the ChatGPT default model on May 5, 2026, with 52.5% fewer hallucinated claims in high-stakes domains, Gmail personalization, and a new Memory Sources transparency feature. Full breakdown of what changed, the API migration path, and when to pin to the old model.

Continue reading the full article on WowHow →

Originally published at https://wowhow.cloud/blogs/gpt-5-5-instant-chatgpt-default-model-hallucination-gmail-2026

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