I tested OpenAI’s three claims about GPT-5.5 Instant, and only one fully held up

OpenAI recently updated ChatGPT's default model from GPT-5.3 Instant to GPT-5.5 Instant. A test of OpenAI's three main claims about GPT-5.5 Instant found that only one claim was fully accurate. This evaluation helps users understand the real improvements in the new model version.

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PublishedWednesday, May 13, 2026 at 4:50 PMMay 13, 04:50 PM

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A head-to-head test of OpenAI's GPT-5.5 Instant against GPT-5.2 on conciseness, accuracy and personalization shows where the new default model improves.

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Opening the briefing

I tested OpenAI’s three claims about GPT-5.5 Instant, and only one fully held up

Original article excerpt

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Opening the briefing

I tested OpenAI’s three claims about GPT-5.5 Instant, and only one fully held up

Original article excerpt

Signal trust

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