not much happened today

**OpenAI** rolled out **GPT-5** as the default in ChatGPT with new modes and a "warmer" personality, plus expanded message limits for Plus/Team users and Enterprise/Edu access. Performance rankings show **gpt-5-high** leading, with smaller variants also ranked, though critiques note some underperformance versus Chinese models and sensitivity to sycophancy. OpenAI enhanced developer tools with a "Quick eval" feature, coding tips, and an improved Playground. **Google** released **Imagen 4** generally available with faster generation and higher resolution, plus the ultra-small **Gemma 3 270M** model with a large vocabulary and ecosystem support. Podcasts featured OpenAI leaders discussing GPT-5 systems, routing, and efficiency.