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via Decrypt · By Decrypt Editorial
OpenAI Just Upgraded ChatGPT's Default Model—Here's What GPT-5.5 Instant Actually Does
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Decrypt Editorial(06:29 PM UTC)
1 min read
In brief
- GPT-5.5 Instant replaces GPT-5.3 Instant as ChatGPT's default model starting today, rolling out to all users for free.
- The model produced 52.5% fewer hallucinated claims than its predecessor on high-stakes medical, legal, and financial prompts in OpenAI's internal tests.
- GPT-5.5 Instant is the first Instant-tier model OpenAI classifies as "High Capability" in both cybersecurity and…
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