Hacker Newsroom AI for 20 April: Changes System Prompt, Prompt Excalidraw Demo Gemma 4, Banned by Anthropic, Uber S Anthropic AI Push

AI Daily: 5-Minute, best of Hacker News · Apr 20, 2026 · 4m

Hacker Newsroom AI for 20 April recaps 5 major AI Hacker News stories, moving through changes system prompt, prompt excalidraw demo gemma 4, banned by anthropic, uber s anthropic ai push.

1. Changes System Prompt

The next story is Simon Willison's comparison of Claude Opus 4. 6 and 4.

Story link

Hacker News discussion

2. Prompt Excalidraw Demo Gemma 4

The next story is a Show HN demo of Prompt-to-Excalidraw running Gemma 4 E2B entirely in the browser, and the author says it can turn a text prompt into diagrams while staying fast enough for real use, which matters because it shows serious…