Watching the livestream highlights, some key takeaways: GPT-5 Hallucination rate has been dramatically improved on and was one of the key areas of focus. Wording is more fluid and 'human' and personal like, with a strong removal of words that have a tendency to show it was AI written (words like testament, tapestry, etc).
Coding demo wasn't anything to write home about after using Claude Sonnet 4.0 and Opus 4.1 through Claude Code or even the regular browser
Some examples shown here.
https://openai.com/index/introducing-gpt-5/
Using this prompt in Claude I got a better one shot game version with Sonnet 4.0 (let alone Opus)
Prompt: Create a single-page app in a single HTML file with the following requirements:
- Name: Jumping Ball Runner
- Goal: Jump over obstacles to survive as long as possible.
- Features: Increasing speed, high score tracking, retry button, and funny sounds for actions and events.
- The UI should be colorful, with parallax scrolling backgrounds.
- The characters should look cartoonish and be fun to watch.
- The game should be enjoyable for everyone.
For fun I created this artifact if you want to see a one shot game with the same prompt with Sonnet 4.0 for apples to apples comparison.
https://claude.ai/public/artifacts/c...f-d32a64dc1c90
I was overestimating how whelmed I would be.