OpenAI Releases GPT-5.3 Instant To Improve ChatGPT

OpenAI released March 3, 2026 a new GPT-5.3 Instant model that targets tone, relevance, and conversational flow. The company says the update reduces unnecessary refusals, improves web-grounded synthesis, lowers hallucinations, and enhances writing assistance. GPT-5.3 Instant rolls out to all ChatGPT users today, with GPT-5.2 variants remaining available to paid users until June 3, 2026.