
GPT-5.5 Instant: OpenAI New Default Model Full Overview 2026
GPT-5.5 Instant reduces medical and legal hallucinations by 52.5% with more concise responses. Learn features, API usage and stable access via 4SAPI.

GPT-5.5 Instant reduces medical and legal hallucinations by 52.5% with more concise responses. Learn features, API usage and stable access via 4SAPI.

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