OpenAI Launches GPT-5.3 Instant to Improve ChatGPT Amid Pentagon Partnership Concerns

OpenAI has released GPT-5.3 Instant, an update to ChatGPT aimed at improving accuracy, reducing hallucinations, and enhancing conversational flow by cutting unnecessary refusals and overly cautious or moralizing responses. The model balances web-sourced information with internal knowledge for better contextualization. This release coincides with criticism over OpenAI's partnership with the U.S. Department of Defense, raising ethical concerns about AI use in military settings. GPT-5.3 Instant is now the default for ChatGPT users and available via API.