OpenAI introduced its newest model, GPT‑5.1, as the default engine for ChatGPT. The update offers two variants—Instant for fast responses and Thinking for more deliberative tasks—while adding real‑time personality and tone controls that let users adjust the chatbot’s style on the fly. The rollout follows criticism of the previous GPT‑5 release, with OpenAI keeping older models available for comparison and planning a phased deployment over several months. Leer más →