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OpenAI Tweaks ChatGPT’s ‘Instant’ Brain with GPT‑5.3 — And Promises GPT‑5.4 Even Sooner

OpenAI has launched GPT‑5.3 Instant, an update designed to make ChatGPT’s most used mode more helpful by reducing unnecessary refusals and improving context comprehension. The company also signalled a faster timetable for GPT‑5.4, suggesting more substantial capabilities — and more intense scrutiny — lie ahead.