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.

The New Stack AI

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Event arc

It clarifies the actual performance gains of the latest GPT model update.

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OpenAI

Market lens

Businesses can better assess whether to adopt GPT-5.5 Instant based on verified capabilities.

Operator take

Consider upgrading to GPT-5.5 Instant after reviewing its proven benefits.

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Sources in this thread (1): The New Stack AI

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