GPT-5.5 Instant
GPT-5.5 Instant is the new default ChatGPT model, released May 5, 2026, with an efficiency-first design that cuts hallucination rates by roughly 50% on high-stakes prompts. It is available on the free tier.
GPT-5.5 Instant is the new default ChatGPT model, released May 5, 2026, with an efficiency-first design that cuts hallucination rates by roughly 50% on high-stakes prompts. It is available on the free tier.