OpenAI

A 23-year-old with no math degree typed an unsolved conjecture into ChatGPT on a Monday afternoon. Eighty minutes later, he had a valid proof that defeated professional mathematicians for sixty years. Fields Medalist Terence Tao confirmed it. The math world is losing its mind. The Kid Who Didn’t Know It Was Hard Liam Price wasn’t trying to make history. He was “vibe mathing” — his term for feeding random open problems into GPT-5.4 Pro to see what happens. He’d been doing it for months with his friend Kevin Barreto, a Cambridge undergrad, pulling unsolved conjectures from erdosproblems.com like lottery tickets. ...

The U.S. military just took its biggest step toward becoming an “AI-first fighting force.” On May 1st, the Department of Defense announced agreements with eight AI companies — SpaceX, OpenAI, Google, Nvidia, Reflection, Microsoft, AWS, and Oracle — to deploy frontier AI models on the Pentagon’s most sensitive classified networks. But the real headline? The company that’s not on the list: Anthropic. What Actually Happened The agreements give all eight companies access to deploy AI on the Pentagon’s Impact Level 6 and IL7 network environments — the most sensitive classified systems where war plans get made and intelligence gets analyzed. ...

A company founded five years ago by researchers who thought AI safety deserved more attention is now worth more than Switzerland’s GDP. Anthropic is closing a $50 billion funding round at roughly $900 billion. If that lands, the Claude maker officially leapfrogs OpenAI — the very company its founders left behind — to become the most valuable AI startup on Earth. Welcome to 2026, where turning away billion-dollar checks is a flex. ...

On Sunday, OpenAI and Microsoft announced the end of their exclusive partnership. By Monday, OpenAI’s models were live on Amazon Web Services. The speed tells you everything about how long this was in the making. This isn’t a cloud provider swap. It’s OpenAI declaring independence — while juggling missed revenue targets, an $852 billion valuation, a looming IPO, and a trial against Elon Musk happening simultaneously. What Actually Changed On April 27, OpenAI and Microsoft jointly announced a restructured deal: ...

The most consequential courtroom drama in AI history kicked off today in an Oakland federal courthouse. Elon Musk — world’s richest person, OpenAI co-founder — versus Sam Altman, the CEO who turned that nonprofit research lab into an $850 billion juggernaut. Between them: a nine-person jury, thousands of pages of internal documents, and a question that could define how artificial intelligence is governed for decades. Opening arguments started this morning. This one’s going to be messy. ...

Three bombshells in 72 hours. OpenAI launched GPT-5.5. China’s DeepSeek dropped V4 at 85% less cost. Google committed $40 billion to Anthropic. The AI industry didn’t just shift — it lurched into a new phase where billion-dollar moves happen simultaneously and the gap between cutting-edge and affordable collapses faster than anyone predicted. GPT-5.5: The “Just Let It Work” Model OpenAI’s latest isn’t about raw intelligence gains. It’s about how the model works. ...

April 24, 2026 might be the most consequential single day in the AI model wars. Within hours of each other, two of the year’s most anticipated systems went live: DeepSeek’s V4 — an open-source behemoth running on Huawei chips with a million-token context window — and OpenAI’s GPT-5.5, which the company calls its “smartest and most intuitive model yet.” Neither was an incremental update. Both represent genuine leaps. And the fact that they dropped on the same day tells you everything about where this industry is right now. ...

Less than two months between GPT-5.4 and GPT-5.5. Even OpenAI president Greg Brockman admitted during Thursday’s press briefing that “there are probably enough model releases that it’s getting hard to distinguish one from another.” He’s right. But GPT-5.5 deserves your attention anyway — not because of what it promises, but because of what it reveals about where this industry is heading at full speed. The Pitch: Less Hand-Holding, More Doing OpenAI’s headline claim is deceptively simple: GPT-5.5 can do more with less guidance. Hand it a messy, multi-part problem and it figures out the plan on its own — choosing tools, checking its work, iterating toward a solution. ...

There’s a saying in venture capital: if you can’t pick the winner, fund the race. Amazon just applied that maxim with a $75 billion budget. Amazon announced it will invest up to $25 billion in Anthropic — the company behind Claude — as part of a sprawling deal committing Anthropic to spending over $100 billion on AWS over the next decade. This comes just two months after Amazon dropped $50 billion on OpenAI’s record-breaking funding round. ...

AI chipmaker Cerebras Systems just filed to go public on Nasdaq under ticker “CBRS.” The headline numbers look incredible: $510 million in revenue, a swing from a $485 million net loss to $87.9 million in net income, and $24.6 billion in remaining performance obligations. But buried in the S-1 is a financial arrangement so tangled it deserves far more scrutiny than it’s getting. OpenAI isn’t just Cerebras’s biggest customer. It’s also an investor, a lender, and the single reason this IPO is happening at all. ...