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

The author compared OpenAI's new default model GPT-5.5 Instant with its predecessor GPT-5.2, evaluating accuracy, conciseness, and personalization. Results show GPT-5.5 significantly improved accuracy with fewer hallucinations; it was less concise but more conversational; personalization saw incremental gains. Overall, GPT-5.5 is a real but modest improvement.

SourceThe New Stack AIAuthor: Nick Lucchesi
I tested OpenAI’s three claims about GPT-5.5 Instant, and only one fully held up
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Under the source content permission, this page provides an editorial summary, key points, and a link to the original article.

Key points and analysis

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EngineersIntermediate

Key points

  • GPT-5.5 performed better on accuracy, especially on high-stakes topics, reducing false claims.
  • In conciseness, GPT-5.2 was more concise, while GPT-5.5 traded conciseness for a more conversational tone.
  • Personalization showed slight improvements, with GPT-5.5 detecting more user patterns, but the difference is subtle.
  • The author concludes GPT-5.5 is a genuine upgrade, though the difference may not be noticeable in everyday use.

Highlights and analysis are generated automatically and may contain errors. Check the original source.

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