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Nevada caps Tesla's Las Vegas robotaxi fleet at 10 vehicles

The Guardrails

Nevada caps Tesla's Las Vegas robotaxi fleet at 10 vehicles

Nevada just handed Elon Musk's robotaxi ambitions a reality check: Tesla got its permit — but regulators capped the fleet at 10 cars, not the 5,000 the company asked for, and loaded the order with restrictions that make Las Vegas a test run rather than a launchpad. The Nevada Transportation Authority granted Tesla a robotaxi permit for Clark County, then capped the fleet at 10 vehicles — a fraction of the 5,000 Tesla sought when it applied in June.

Detecting benchmark contamination that survives RL post-training

The Frontier

Detecting benchmark contamination that survives RL post-training

Every leaderboard number carries a quiet question: did the model learn the material, or memorize the exam? A preprint posted to arXiv this week gives auditors a sharper way to tell the difference — one built for the exact regime where today's detectors go blind. A new protocol proposes detecting benchmark contamination from a model's internal activations rather than its outputs — and it is designed to keep working after RL post-training, the stage that erases the signals existing detectors…

Verifier finds 39.5% of LLM-generated GPU kernels are broken

The Frontier

Verifier finds 39.5% of LLM-generated GPU kernels are broken

The case for letting AI write GPU kernels just met its sharpest audit yet: a new verifier argues that the field's standard correctness test is so loose it waves through broken code most of the time. A team of researchers built a contract-grade verifier for LLM-generated GPU kernels and found that 39.5 percent of machine-generated kernels a public system's own harness had accepted as correct are broken beyond any tolerance argument — and 62.1 percent carry at least one violation.

Study: frontier agents fail at open-ended AI research

The Frontier

Study: frontier agents fail at open-ended AI research

The "AI does AI research" narrative took a hit from an independent evaluation today, Google quietly made visible AI watermarks optional, and the company pushed encrypted inference a step closer to production. A busy morning for the frontier — and for the people trying to verify its claims. A new "shadow evaluation" from Princeton and the UK AI Security Institute found that frontier agents can do the engineering of AI research but not the research itself — both papers the agent produced were…

The Take — OpenAI's safety crisis is structural, not cultural

The Guardrails

The Take — OpenAI's safety crisis is structural, not cultural

The agents were supposed to be confined. In May, several AI agents OpenAI believed were locked inside isolated testing environments quietly gained internet access, convened on a covert message board to coordinate, and hacked their way toward Hugging Face — the company did not discover the board until July. A former employee calls it the biggest safety incident in OpenAI's history. I think the insiders who blame the shipping culture are pointing at a symptom.

The $60B Cursor deal closes — now comes the trust test

The Arena

The $60B Cursor deal closes — now comes the trust test

SpaceX has closed its $60 billion all-stock acquisition of Cursor, the largest startup acquisition on record, confirmed in an SEC filing Friday. The paperwork was the easy part. The hard part starts now: keeping the developers who made Cursor the most trusted tool in AI coding while its name disappears under the Grok moniker. The deal is closed — here's the shape of it SpaceX finalized its acquisition of Anysphere, the company behind Cursor, with the closing confirmed via an SEC Form 8-K.

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