DEVOURED
OpenAI made GPT-5.5 Instant the new ChatGPT default, cutting hallucinations by 52.5% in medical, legal, and financial prompts compared to its predecessor GPT-5.3 Instant.
What: OpenAI rolled out GPT-5.5 Instant as the new default model for all ChatGPT users on May 5, 2026, replacing GPT-5.3 Instant. The model showed 52.5% fewer hallucinated claims on high-stakes evaluations covering medicine, law, and finance, and 37.3% fewer inaccurate claims on user-flagged difficult conversations. It's available in the API as chat-latest. OpenAI also launched memory sources, showing users which past chats, uploaded files, or Gmail context influenced each answer. Paid users retain access to GPT-5.3 Instant for three months.
Why it matters: Upgrading the free default model instead of gating improvements behind premium tiers signals OpenAI's bet that raising the floor for hundreds of millions of everyday users matters more for product strategy than incremental gains for power users, while the memory sources feature indicates a shift toward persistent, context-aware assistance over one-off Q&A.
Original article
The new Instant model is designed to produce clearer, shorter, and more accurate answers than previous models.
Explore all 66 articles in today's digest
Fresh dev news, AI-digested daily. Never miss a trend at devoured.fyi