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GPT-5.5 Instant release and system card
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OpenAI released GPT-5.5 Instant on May 5, 2026, updating ChatGPT's default model with improved accuracy, reduced hallucinations, and enhanced personalization controls.
- GPT-5.5 Instant became ChatGPT's new default model as of May 5, 2026
- Model delivers smarter and more accurate answers compared to previous versions
- Reduced hallucination rate is a core improvement in this release
- Enhanced personalization controls allow users to customize responses
- OpenAI published a system card documenting model capabilities and limitations