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GPT-5.5 Instant

OpenAI | In Edition 33,

The call on this one

DEPLOYif you use ChatGPT daily

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

GPT-5.5 Instant replaces GPT-5.3 Instant as the default model for all ChatGPT users and in the API as chat-latest. It produced 52.5% fewer hallucinated claims than GPT-5.3 Instant on high-stakes prompts covering medicine, law, and finance, and reduced inaccurate claims by 37.3% on conversations users flagged for factual errors.

Added to The Deploy Log , updated . Read Edition 33, the edition that carried it.

93 rows from OpenAI in The Deploy Log are dated on or before this one, this one included.

The same day from OpenAI: GPT-5.5-Cyber (0 days apart). After it: Codex mobile app, 5 days later.

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