A 7-minute guide to prompting GPT-6 Astra
The author lists setup steps for Astra: use the app instead of the browser, upgrade to Pro, pick Astra in Work mode with effort set to Medium, and follow a prompt guide.

If I had only 7 mins to learn how to prompt (the new) ChatGPT-6-Astra. I would read this free prompt engineering guide: http://chatgpt.rubenhassid.ai. Step 1. Download the ChatGPT app. Do not use ChatGPT in the browser. You won't have access to Work mode. You won't see any Astra model. Step 2. Upgrade to the Pro plan. GPT-6-Astra is not available on a free tier. It will be available for Plus users eventually. Step 3. Go to ChatGPT Work mode Select GPT-6 Astra from the toggle. Set the effort to "Medium". Step 4. Go to http://chatgpt.rubenhassid.ai Copy and paste my prompts from the guide. I read the entire official GPT-6 prompting guide. So you don't have to. Step 5. Always add these two words in your prompt: "Use ASD-STE100." to receive no BS answers. Full setup guide + prompts: http://chatgpt.rubenhassid.ai
This post quotes another post: x.com/rubenhassid/status/2096841587313787149