OpenAI upgrades GPT-5.5, as it plans to retire legacy ChatGPT models

OpenAI releases an update to GPT-5.5 Instant, enhancing response accuracy and speed. The update focuses on reducing hallucinations in real-time conversations. GPT-5.5 Instant now handles 20% more complex queries than previous versions. OpenAI plans to retire o3 and other legacy models by end of Q3. The update is available to all users through the ChatGPT interface. Builders using real-time chat APIs can expect improved consistency and lower error rates.