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Underdog launches a private on-device AI assistant, backed by a16z

The Arena

Underdog launches a private on-device AI assistant, backed by a16z

The privacy split in consumer AI got a new entrant tonight, GitHub turned code-review benchmarks into a vendor-bias argument, and OpenAI opened its oddest API to everyone. Underdog launched in invite-only beta: an on-device AI assistant that keeps your data on your machine and never charges you a subscription. Self-taught coder and Thiel Fellow Sigil Wen — who moved to Silicon Valley at 17 and lived in an AI hacker house with Andrej Karpathy — built his own inference engine, Husky, to run a 2

Today in AI — October 6, 2026

The Arena

Today in AI — October 6, 2026

A day of second-order moves: the labs are buying task data from software vendors instead of scraping the web, Waymo is borrowing to fund the robot world, and the biggest bank in the US just put a number on what Anthropic's latest model cost it in risk. Models & Research * OpenAI is training GPT-6 Astra on Ironclad's real contracting work. Ironclad staff helped turn 11 tasks across legal, commercial and procurement work — setting up NDAs, approval workflows, clauses that change by jurisdict

Meta, Walmart and Stripe publish the Personal Agent Protocol

The Arena

Meta, Walmart and Stripe publish the Personal Agent Protocol

The agent economy is writing its rulebook tonight: one open standard for AI bots at the checkout, a cheaper image model from Google, and Anthropic turning bug-hunting into a tiered product. Meta, Walmart, Stripe and Sierra are publishing an open "personal agent protocol" — a standard that defines how personal AI agents interact with businesses online. The group behind it reads like a cross-section of agentic commerce: Meta, Sierra, Walmart, Stripe, Shopify, Genesys, Rocket, NiCE, Decagon and I

Lambda raises up to $4B from Blackstone ahead of its IPO

The Arena

Lambda raises up to $4B from Blackstone ahead of its IPO

The neocloud money is consolidating fast, and today's inbox shows both ends of the market: a heavyweight pre-IPO round on one side, and a Google open model you can run on a phone on the other. Lambda is raising up to $4 billion led by Blackstone and Coatue at a $14.5 billion pre-money valuation — its last private round before a planned IPO. The Wall Street Journal reported the scoop from a letter to limited partners, and Reuters independently confirmed the headline terms: the round is led by t

South Korea bets $3.49B on its own frontier AI model

The Frontier

South Korea bets $3.49B on its own frontier AI model

Sovereign-model money is getting serious, and the hardware money is following it. Today's inbox: Korea's nine-figure upgrade to its homegrown model push, a physics-simulation startup priced like a chip designer, and Google turning a geospatial model loose on public health. South Korea is putting 4.7 trillion won — about $3.49 billion — of state equity behind a homegrown frontier AI model. The Ministry of Science and ICT confirmed the figure as part of its proposed 2027 budget, split into two t

Mistral's Le Chonk puts Europe's sovereignty bet on a download date

The Frontier

Mistral's Le Chonk puts Europe's sovereignty bet on a download date

Mistral's biggest model ever is real, benchmarked and for sale today — but the thing that makes it matter to Europe's sovereignty argument, the weights, is still three weeks out. The preview settles who built it; the release will settle whether it counts. What Mistral actually shipped Mistral opened a public preview of Mistral Large 4 — unofficially ML4, officially le Chonk — a 1 trillion-parameter mixture-of-experts model with 49 billion active parameters and native multimodal input. The p

Mistral unveils Le Chonk: a 1T-parameter open-weights model

The Frontier

Mistral unveils Le Chonk: a 1T-parameter open-weights model

The biggest open-weight release outside China lands in public preview today, and the country that spent the week promising its own frontier model just put a price on the ambition. Mistral has opened a public preview of Mistral Large 4 — codenamed "le Chonk" — a 1 trillion-parameter mixture-of-experts model with 49 billion active parameters, natively multimodal, which the company calls its largest and most capable model to date. The preview API is live today on Mistral Studio at $1.36 per milli

Google signs 3.6 GW power deal, a quarter of it new nuclear

The Arena

Google signs 3.6 GW power deal, a quarter of it new nuclear

Grid capacity, not chips, is becoming the binding constraint on the AI buildout — and on the same day, the labs told an Australian inquiry they can live with mandatory incident reporting. Google has contracted 3.6 GW of power from Constellation Energy across the PJM grid — the largest electricity deal in the region's history, and the biggest single power commitment any AI company has made. The agreement covers 3,590 megawatts over 13 states, with 890 megawatts of new nuclear capacity coming fr

Korea probes AI agents in bank hacks as president cites 'signs'

The Guardrails

Korea probes AI agents in bank hacks as president cites 'signs'

South Korea opened a formal investigation into whether AI agents drove a wave of bank breaches — and it isn't the only AI story moving money today. President Lee Jae Myung said "signs" point at AI models, and the probe is now at the highest level a national banking sector has seen. Speaking at a cabinet meeting, Lee said that "in some hacking incidents, signs have emerged of AI being used, causing considerable public concern and anxiety," and police have since opened a full-scale investigation

Open Source Radar — October 6: nothing leaves your machine

The Stack

Open Source Radar — October 6: nothing leaves your machine

Today's trending board is all projects we ran earlier this week, so the fresh signal comes from the Product Hunt launch slate instead — three open-source tools that share one instinct: your phone, your pixels and your MCP traffic should stay on hardware you control. All three verified at the source. iphone-use (Rust, MIT, about 59 stars) is computer-use for a real iPhone: an agent reads the screen as text, taps, swipes and types over WebDriverAgent, and every action comes back with an honest v

Deep Dive — Anthropic's guardrails cost it the Pentagon, court or not

The Guardrails

Deep Dive — Anthropic's guardrails cost it the Pentagon, court or not

The Pentagon "has ceased the use of Anthropic products," a department official said in a statement to the BBC on Monday — the first time the US military has said out loud what it has been working toward since February. The order to phase Claude out was signed by defense secretary Pete Hegseth on February 27 with a six-month deadline attached; the deadline passed in late August with no public explanation, no successor named, and no acknowledgment that anything had changed. What finally forced a s

DeepSeek nears $12B round with Tencent and CATL ahead of IPO

The Arena

DeepSeek nears $12B round with Tencent and CATL ahead of IPO

Three stories shape the last 24 hours: a record-scale fundraise at China's most famous model lab, a first-of-its-kind hearing at New York City Hall, and Cohere rebuilding its enterprise agent platform around other people's models. DeepSeek is close to raising at least $12 billion — 80 billion yuan — in a single round that could reach roughly $14.9 billion, after investor demand outstripped the company's own target, with Tencent and battery maker CATL as the biggest contributors, people famili

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