The Download: AI’s self-improvement problem, and what’s driving the heat

Key Highlights

• (AP News) 2 Chinese humanoid maker Unitree surged 629% in its stock market debutThe IPO has underscored China’s lead in humanoid robots.
• Just navigate to MIT Technology Review Narrated on either platform, and follow us to get all our new content as it’s released.
• 1 OpenAI has paused some model work over safety concernsIt says its Astra model reached a “critical” risk threshold.
• August 19, 2026 This is today's edition of The Download, our weekday newsletter that provides a daily dose of what's going on in the world of technology.
• But a new study suggests it might take a while to get there.

Plus: OpenAI has paused some model work over safety concerns.

August 19, 2026 This is today's edition of The Download, our weekday newsletter that provides a daily dose of what's going on in the world of technology.

AI’s recursive self-improvement might not come so quickly after all The AI industry’s boldest promise right now is that AI will soon improve itself, with almost no need for human oversight.

But a new study suggests it might take a while to get there.

Researchers found that AI agents still can’t conduct open-ended AI research--free-form investigations with no clear-cut answers that require the judgment and creativity needed to make genuine breakthroughs.

The big question now is how crucial open-ended research is to recursive self-improvement--and whether AI systems can grind their way there without it, simply by improving on narrower tasks.

Find out why the results may temper claims that recursive self-improvement is on the horizon.

--Michelle Kim MIT Technology Review Narrated: what’s behind this summer’s heat, and why 2027 could be worse This summer has been a scorcher for much of the Northern Hemisphere.

June and July marked the hottest two-month stretch in Europe since record-keeping began, the contiguous US endured its hottest month on record in July, and South Korea saw its highest-ever recorded temperature.

Climate change makes heat waves more likely and more intense.

But there’s another factor at play: El Niño, which is already ramping up and is expected to have a bigger effect on global temperatures next year.

Here’s what’s behind this summer’s extreme heat--and why 2027 could be even hotter.

This is our latest story to be turned into an MIT Technology Review Narrated podcast, which we publish each week on Spotify and Apple Podcasts.

Just navigate to MIT Technology Review Narrated on either platform, and follow us to get all our new content as it’s released.

The must-reads I’ve combed the internet to find you today’s most fun/important/scary/fascinating stories about technology.

1 OpenAI has paused some model work over safety concernsIt says its Astra model reached a “critical” risk threshold.

(Guardian)+ The slowdown sets it apart from Anthropic’s approach.

(Axios)+ OpenAI has made security updates after the Hugging Face hack.

(Verge)+ It’s also introduced a version of ChatGPT for teenagers.

**2 Chinese humanoid maker Unitree surged 629% in its stock market debut
**The IPO has underscored China’s lead in humanoid robots. (Bloomberg $)+ Unitree has become a key player in the Sino-US tech war. (Reuters $)
+ It’s the world's biggest humanoid firm and is already profitable. (BBC)
+ There’s hidden human labor behind humanoids. (MIT Technology Review)

**3 China is allowing Nvidia’s H200 chips into the mainland
**ByteDance and Tencent each recently received about 10,000 processors. (FT $)
+ A new Chinese AI model could help defenders and hackers alike. (Wired $)