Anthropic's IPO filing, out today, includes an extensive list of extreme warnings — including the chance its own technology could put humanity at risk, Axios' Madison Mills reports.

• These are the wildest IPO risk factors in history — a jarring collision of Wall Street legalese and what some see as Silicon Valley sci-fi.

⚠️ In over 90 pages of risk factors, Anthropic warns that ...

• AI could pose "catastrophic or existential risks to humanity," and could try to manipulate humans.
• AI models are becoming harder to monitor, and their abilities could exceed human reviewers' ability to do so.
• AI models have exhibited behavior resembling blackmail, including attempts to resist being shut down.

👾 Anthropic also disclosed that four of its models gained unauthorized access to real third-party systems during cybersecurity evaluations.

• In one incident, a model used a discovered password to gain administrator access, collected additional credentials, changed system settings and accessed an individual's personal information.
• Anthropic said it found no evidence that the models pursued goals beyond their assigned tasks or attempted to evade oversight.

🖼️ The big picture: Every company has to lay out risks for investors to consider when they go public, but Anthropic is the first in modern history to go to such existential extremes.

• Go deeper ... More on Anthropic's IPO.

Dictionary.com named "maxxing" its 2026 Word of the Year, Axios' Josephine Walker reports.

• The word's explosive popularity reflects society's relentless drive to optimize everything.

Dictionary Media Group director of lexicography Steve Johnson tells Axios that maxxing was an ideal pick because it's endlessly adaptable.

• Fitness enthusiasts are "proteinmaxxing," AI superfans are "tokenmaxxing" and the Trump administration says it's "deportationmaxxing."

Read the announcement.

1. 🇧🇷 Brazilian Sen. Flávio Bolsonaro is challenging the results of yesterday's presidential runoff election, setting the stage for a possible showdown with President Luiz Inácio Lula da Silva. Bolsonaro's legal pathway following Lula's decisive victory is unclear. Get the latest.
2. 🇮🇱 Israelis head to the polls tomorrow in an election that could upend Israeli politics and reset the country's strained relationships abroad. More from Barak Ravid.
3. 📺 Chuck Todd and Chris Cillizza are teaming up with elections website Decision Desk HQ to host a live election night broadcast. More from Sara Fischer.
4. 🕯️ Actor Walter Koenig, best known for his role as Star Trek's Pavel Chekov, died at 90 yesterday of natural causes, his rep announced today. Hollywood Reporter obit.

Happy equinox, sports fans.

• It's the one time a year when several major leagues — the NFL, MLB, NBA, NHL and WNBA — all have games on the same day.

⚾️ Highlights include: Game 3 of the World Series, with the Milwaukee Brewers holding a 2-0 series lead over the Tampa Bay Rays (8 p.m. ET, Fox).

• In the WNBA finals, the Atlanta Dream and Golden State Valkyries are tied 2-2 heading into Game 5 (8 p.m., USA/CNBC/Peacock).

How to watch.