7.19.26 | GPT-5.6 closes convex optimization gap, Mayor Mamdani bans AI images for advertising, speech recognition and TTS less than 500kb

Hacker News Highlights · Jul 19, 2026 · 13m

This is a recap of the top 10 posts on Hacker News on Jul 19, 2026.

Feel free to leave feedback on Github: https://github.com/denolfe/hacker-news-highlights

(00:00) - Intro

(00:20) - GPT-5.6 used a prompt to close a 30-year gap in convex optimization

(01:53) - Mayor Mamdani Says Landlords Can't Use AI Images to Advertise

(03:21) - Speech Recognition and TTS in less than 500kb

(04:33) - Transcribe.cpp

(05:53) - If You Build It, They Will Come

(07:05) - The Kimi K3 Moment

(08:26) - Fable 5 vs. GPT-5.6 Sol on an NP-Hard Problem: Does /goal help?

(09:56) - Gleam Is Now on Tangled

(11:15) -…