1. Advanced Reasoning (“Thinking Built In”)

GPT-5 takes a big leap in reasoning ability. It can now pause to “think deeply” before responding, leading to clearer, more structured answers, especially for complex problems like trip planning or puzzles. OpenAITom’s Guide

2. Expanded Context Window & Multimodal Mastery

GPT-5’s memory has gone huge—some sources cite an expanded context window up to 1 million tokens, enabling coherent interaction across long conversations or large documents. Plus, it’s impressively multimodal, handling text, images, audio, and even video inputs. Cinco Días+1Geeky Gadgets

3. Customizable Personalities & Smarter Voice

Now you can personalize the conversation—choose how ChatGPT sounds or behaves, from tone to personality, and even tweak chat aesthetics. Alongside that, voice interactions have become more natural and expressive. OpenAIThe Times of IndiaCinco Días

4. Safe, Reliable, and Context-Aware Responses

GPT-5 introduces “Safe Completions”: it can handle sensitive queries more thoughtfully—offering guidance or explanations rather than abrupt refusals, striking a better balance between safety and usefulness. Tom’s GuideWikipediaThe Guardian

5. Deep Integration & Productivity Boosters

Go beyond chat: GPT-5 now connects seamlessly with tools like Gmail and Google Calendar. There’s even a Study Mode for personalized learning, as well as powerful coding capabilities—able to build apps or UIs from a single prompt. OpenAIThe Times of IndiaTom’s Guide