OPENAI LAUNCHES CHATGPT 5.1 WITH DUAL MODES AND ENHANCED USER EXPERIENCE FOR BRANDS

Summary from the TLDR Design newsletter

OpenAI has launched ChatGPT 5.1, introducing two operating modes: GPT-5.1 Instant for warmer, conversational responses and GPT-5.1 Thinking for deeper reasoning on complex questions. The update expands tone customization with new styles, including Professional, Candid, and Quirky, allowing users and brands to fine-tune their personality, warmth, and emoji use. Technical improvements include better long-form context retention, faster response generation, reduced token usage, and extended prompt caching for more efficient API deployment.