OpenAI launched GPT-5.5Instant as ChatGPTs new default model replacing GPT-5.3Instant It shows improved reasoning with higher scores on AIME2025 and MMMU-Pro benchmarks and reduces cognitive biases in law medicine and finance Key features include enhanced context management using search tools for personalized responses and a visualized memory source mechanism for transparency The model is now available for web PlusPro users with broader rollout planned GPT-5.5 will be offered via API as chat-latest while GPT-5.3Instant remains a paid option for three months
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