The Daily Index — Friday, August 29, 2025 · TLDR Index

Across today’s newsletters

Today’s Index

TLDR

MICROSOFT STARTS TESTING AI MODEL THAT COULD ESCALATE COMPETITION WITH OPENAI

Microsoft has started testing its MAI-1-preview model on LMArena. MAI-1-preview is a foundation model trained end-to-end in-house by Microsoft. The model will be rolled out for certain text use cases within Copilot over the coming weeks. Developers can fill in a form to request early access.

cnbc.com · 3 min

TLDR AI

MICROSOFT RELEASES TWO IN-HOUSE MODELS

Microsoft AI has launched MAI-Voice-1, a speech generation model that can produce a minute of audio in under a second, and MAI-1-preview, a mixture-of-experts foundation model trained on ~15,000 NVIDIA H100 GPUs. The technical capabilities of the models are unclear, but they indicate Microsoft's intention to reduce its reliance on OpenAI's model to power its AI offerings.

microsoft.ai · 3 min

TLDR Web Dev

YOU'RE LOADING FONTS WRONG (AND IT'S CRIPPLING YOUR PERFORMANCE)

Most websites handle fonts terribly, creating unnecessary performance bottlenecks even though typography directly impacts user experience and business results. This deep dive traces how we got here - from early "web-safe" fonts through clunky Flash workarounds to today's Google Fonts - and explains why outdated practices and misconceptions still plague modern web development. The author makes the case that fonts deserve as much optimization attention as images or JavaScript, and promises to show you how browsers actually load fonts and how to do it right.

jonoalderson.com · 8 min

TLDR InfoSec

FREEPBX SERVERS HACKED VIA ZERO-DAY, EMERGENCY FIX RELEASED

There is an actively exploited zero-day vulnerability affecting systems with exposed Administrator Control Panel (ACP). Hackers have exploited it since August 21, compromising servers and affecting thousands of SIP extensions, allowing attackers to run commands as the Asterisk user. Sangoma has released emergency EDGE module fixes. It recommends blocking ACP access, restoring from pre-August 21 backups if compromised, and rotating all credentials.

bleepingcomputer.com · 4 min

TLDR Crypto

JPMORGAN BELIEVES BITCOIN IS UNDERVALUED, SEES $126K BY YEAR-END

Bitcoin's current price is “too low” relative to gold as volatility hits record lows, setting a fair value of $126,000 by year-end. Corporate treasury accumulation, index-driven inflows from Strategy and Metaplanet, and reduced volatility seems to have boosted bitcoin's institutional appeal. With BTC's volatility ratio to gold at a record 2.0, Bitcoin is closer than ever to gold on a risk-adjusted basis.

links.tldrnewsletter.com · 3 min

TLDR

ELON MUSK REVEALS WHEN SPACEX WILL PERFORM FIRST-EVER STARSHIP CATCH

Elon Musk says that SpaceX will attempt to catch Starship on Flight 13, 14, or 15, depending on how well the V3 flights go. The V3 rocket is more powerful than V2 in terms of initial thrust and booster thrust, and it has a higher payload-to-orbit rating. V4 will likely be the first version to carry humans to space. Musk has previously said that SpaceX hopes to attempt a catch of Starship this year, but the company will need to launch two more flights before the end of the year to get to his expected first catch attempt of Flight 13.

teslarati.com · 3 min

TLDR

STARSHIP WILL REDUCE BANDWIDTH LAUNCH COST BY UP TO 50X

Even if fully expendable, Starship already has an around 40% lower cost per kilogram than a mature Falcon 9. With reuse, Starship's cost per kilogram quickly falls towards a $60 per kilogram floor. Starship introduces a different cost regime that will transform the industry to be supply-rich, price-flexible, and capability-driven. For Starlink, this will mean faster scale, richer service tiers, and room to price for demand and margin.

research.33fg.com · 12 min

TLDR

THE WORLD'S LARGEST SAND BATTERY JUST WENT LIVE IN FINLAND

Finnish Firm Polar Night Energy has built an industrial-scale sand battery in Pornainen, Finland. The battery is set to reduce carbon emissions from the local heating network by as much as 70%. At 42 feet tall and 50 feet wide, the battery can store up to 100 MWh, enough to heat the whole town for a week. The sand battery can hold a charge for months at a time, helping balance the energy grid during periods of high demand. A video of the battery being put together is available in the article.

newatlas.com · 4 min

TLDR

INTRODUCING GPT-REALTIME AND REALTIME API UPDATES FOR PRODUCTION VOICE AGENTS

OpenAI's Realtime API, powered by gpt-realtime, enables developers to build reliable, production-ready voice agents. It supports remote MCP servers, image inputs, and phone calling through Session Initiation Protocol. OpenAI has released two new voices in the Realtime API, Cedar and Marin. OpenAI's most advanced speech-to-speech model yet, gpt-realtime shows improvements in following complex instructions, calling tools with precision, and production of speech that sounds more natural and expressive.

links.tldrnewsletter.com · 8 min