AI Model Report

Reviews · Featured review · MAY 5, 2026

Reviewed: GPT-5.5 Instant ships as ChatGPT's new default with a 52.5% hallucination-reduction claim

OpenAI's May 5 update to the default ChatGPT model promises sharper answers on medicine, law, and finance. The headline number is internal; the rollout is universal.

By Karl Strauchman · Senior model reviewer

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