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1.2026.146
GPT-5.5 Instant is now ChatGPT's default model, featuring smarter and more accurate answers with reduced hallucinations and improved person…
OpenAI · Product ReleasesAs of March 11, 2026, GPT-5.1 models are no longer available in ChatGPT. This applies to GPT-5.1 Instant, GPT-5.1 Thinking, and GPT-5.1 Pro…
OpenAI · Models
