GPT-5.5 Instant becomes ChatGPT default with 50% fewer hallucinations, plus real-time audio suite and Ads Manager

OpenAI made GPT-5.5 Instant the default ChatGPT model, claiming over 50% fewer hallucinated claims in high-stakes scenarios with context drawn from past chats, files, and Gmail. It also launched GPT-Realtime-2, GPT-Realtime-Translate (70+ languages), and GPT-Realtime-Whisper, plus a self-serve Ads Manager targeting $2.5B in 2026 ad revenue. ChatGPT additionally added a 'Trusted Contact' safety feature.