The Daily Index — Tuesday, February 3, 2026 · TLDR Index

Across today’s newsletters

Today’s Index

TLDR

SPACEX, XAI TIE UP, FORMING $1.25 TRILLION COMPANY

SpaceX has acquired xAI. The combined company is valued at $1.25 trillion - the merger valued xAI at around $250 billion. The merger is structured as a share exchange, with shares in xAI being converted into 0.1433 shares of SpaceX stock. Employees will have the option to cash out and sell their xAI shares back to the company.

links.tldrnewsletter.com · 3 min

TLDR AI

OPENAI LAUNCHED CODEX FOR MACOS

OpenAI released a new macOS app for Codex designed to coordinate multiple agents, run tasks in parallel, and manage long-running software projects. It's now available to ChatGPT Free and Go users for a limited time, with doubled rate limits for paid tiers.

links.tldrnewsletter.com · 8 min

TLDR Dev

UNROLLING THE CODEX AGENT LOOP

OpenAI's Codex CLI is a cross-platform local software agent. The core agent loop orchestrates interactions between the user, the model, and various tools, iteratively building prompts from user input, system instructions, and tool definitions, querying the model, executing requested tool calls, and appending results to the prompt. To manage performance and context window limitations, Codex uses prompt caching and conversation compaction to summarize past interactions.

links.tldrnewsletter.com · 20 min

TLDR InfoSec

NOTEPAD++ HIJACKED BY STATE-SPONSORED HACKERS

Notepad++ confirmed that a suspected Chinese state-sponsored group compromised its shared hosting provider from June through December 2025, selectively redirecting update traffic to serve malicious installers by exploiting insufficient update verification controls. The attackers maintained persistent access through stolen internal service credentials even after losing direct server access in September 2025. Notepad++ has since migrated hosting providers and hardened its update mechanism with certificate and signature verification in v8.8.9, with full XMLDSig enforcement expected in v8.9.2.

notepad-plus-plus.org · 4 min

TLDR Crypto

FORGET 'DIGITAL GOLD': TRADERS ARE FLEEING TO STABLECOINS

Despite the crypto market expanding to thousands of altcoins and gaining institutional adoption, 2026 price action demonstrates that the market still moves in lockstep with bitcoin, offering little real diversification as BTC's 14% year-to-date decline to $75,000 has dragged nearly all of the crypto sectors down. Paradoxically, revenue-generating protocols have declined alongside Bitcoin despite producing actual cash flows, while industry narratives continue labeling BTC, ETH, and SOL as "safe havens," with some arguing the industry needs to build consensus around truly resilient sectors like DeFi, similar to how traditional markets designated consumer staples and utilities as defensive. Stablecoins have emerged as the true defensive allocation in crypto.

coindesk.com · 5 min

TLDR

ANTHROPIC IS ABOUT TO DROP SONNET 5 DURING SUPER BOWL WEEK

Leaks show that a new model by Anthropic, branded as Claude Sonnet 5, has an internal date string of February 3, 2026. It is unclear whether this is a public launch date or an internal checkpoint. The timing would coincide with the Super Bowl, which is an event where AI labs have been ramping up mainstream marketing to chase consumer mindshare. Early testing indicates the model already looks competitive on math with today's frontier-tier models, and it shows even stronger coding output than Claude Opus 4.5 in some workflows.

testingcatalog.com · 1 min

TLDR

WAYMO RAISES MASSIVE $16 BILLION ROUND AT $126 BILLION VALUATION, PLANS EXPANSION TO 20+ CITIES

Waymo just closed a $16 billion funding round at a $126 billion valuation. It plans to use the capital to expand to over 20 new cities this year, including its first international markets, Tokyo and London. The company's cars have driven 127 million fully autonomous miles with a 90% reduction in serious injury crashes compared to human drivers. It performed 15 million rides in 2025, a 3x growth from 2024.

electrek.co · 2 min

TLDR

GUINEA WORM ON TRACK TO BE 2ND ERADICATED HUMAN DISEASE; ONLY 10 CASES IN 2025

The Guinea worm is a parasitic nematode found in waters that contain small crustacean copepods. Humans can ingest them through contaminated water, and this results in painful blisters, usually in the feet and legs, that can cause searing pain as the worms fully emerge. The disease can lead to complications such as secondary infections and sepsis, which can in turn lead to temporary or permanent disability. There were only 10 human cases in three countries in 2025 - down from an estimated 3.5 million cases across 21 countries in 1986.

arstechnica.com · 2 min

TLDR

INTRODUCING THE CODEX APP

OpenAI has released a new macOS app for its Codex coding agent. The app provides a nice UI over the capabilities of the Codex CLI agent and adds new features, like first-class support for Skills and Automations for running scheduled tasks. Automations are currently restricted to only run when devices are powered on. OpenAI will enable cloud-based automations soon to resolve this limitation.

simonwillison.net · 3 min