OpenAI releases GPT-5.5 Instant as new default ChatGPT model
Original: OpenAI releases GPT-5.5 Instant, a new default model for ChatGPT
Why This Matters
Major AI model upgrade enhances accuracy and context awareness in enterprise applications
OpenAI launched GPT-5.5 Instant on Tuesday, replacing GPT-5.3 Instant as ChatGPT's default model. The update reduces hallucinations in sensitive areas like law, medicine, and finance while maintaining low latency and improving context management features.
OpenAI released GPT-5.5 Instant as the new default ChatGPT model, replacing GPT-5.3 Instant. The model shows significant performance improvements, scoring 81.2 on the AIME 2025 math test versus 65.4 for its predecessor, and achieving 76 vs. 69.2 on the MMLU-Pro multimodal reasoning benchmark. Key features include enhanced context management allowing the model to reference past conversations, files, and Gmail for personalized responses. Plus and Pro users get web access first, with mobile and other tiers following. The update adds memory source visibility across all models, letting users delete or correct outdated information. For developers, GPT-5.5 is available via API as 'chat-latest,' while GPT-5.3 remains accessible for three months.