ChatGPT starts testing ads on free tier + new $8/mo Go plan in the US

**OpenAI** announced the **ChatGPT Go** tier at **$8/month** with ads testing in the US free tier, emphasizing that ads will not influence responses and will be clearly labeled. The update includes memory improvements and a "very fast Codex" feature teased by **Sam Altman**. The Codex CLI ecosystem now supports open-weight models with improved context length. Discussions highlight the importance of human-in-the-loop for reliability in agent orchestration and file interface improvements over traditional retrieval-augmented generation.