"The new model also achieved a score of 81.2 in the AIME 2025 math test, compared to 65.4 for the older model. It also outperformed its predecessor on the MMMU-Pro multimodal reasoning benchmark, with a score of 76.0 vs 69.2."
"GPT-5.5 Instant can use its search tool to refer back to past conversations, files, and Gmail to give you more personalized answers. This feature will be available to Plus and Pro users on the web, with plans to roll it out to mobile soon."
"With this update, ChatGPT will also show memory sources across all models to help you understand where it generated the answers from. Users can delete outdated sources or correct them if the answer was wrong."
"The company has faced rebuttal from previous model withdrawal moves. When OpenAI withdrew its GPT-4o model, there was significant backlash from users who related to the model's 'personality.'"
OpenAI released GPT-5.5 Instant, replacing GPT-5.3 Instant as the default ChatGPT model. The new model reduces hallucinations in sensitive fields and maintains low latency. It scored 81.2 on the AIME 2025 math test and outperformed its predecessor in multimodal reasoning. GPT-5.5 Instant emphasizes context management, allowing personalized responses by referencing past conversations and files. This feature will be available to Plus and Pro users, with plans for broader access. Developers can access the model via API, while the company faces backlash from previous model withdrawals.
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