OpenAI Launches GPT-5.5 Instant with Major Hallucination Reductions

OpenAI has rolled out GPT-5.5 Instant as the new default ChatGPT model, replacing GPT-5.3 on May 5. The update boasts a 52.5% reduction in hallucinated claims across critical fields like medicine, law, and finance, addressing a long-standing challenge for AI models. Beyond accuracy improvements, GPT-5.5 Instant introduces cross-session memory, enabling more coherent multi-turn conversations. It also now features native integrations with Excel and Google Sheets, streamlining workflows for professionals. The release underscores OpenAI's focus on practical usability and reliability, setting a higher bar for AI assistants. This move comes amid intensifying competition in the generative AI space, with rivals racing to improve model performance. Users can expect these enhancements to significantly improve productivity and trust in AI-generated outputs.