OpenAI releases GPT-5.5 Instant, a new default model for ChatGPT
OpenAI says the new default ChatGPT model reduces hallucinations in sensitive domains while keeping low latency, and it’s also available via the API as “chat-latest.”
OpenAI released GPT-5.5 Instant and made it the new default model for ChatGPT, replacing GPT-5.3 Instant. The company says GPT-5.5 Instant reduces hallucinations in sensitive areas like law, medicine, and finance while maintaining low latency.
OpenAI also highlighted higher scores on benchmarks like AIME 2025 and MMMU-Pro versus its predecessor, and said developers can access GPT-5.5 through the API as “chat-latest,” with GPT-5.3 available as an option for a limited period.
Read the original reporting at TechCrunch.
