o0o0o0o / 007 13 Nov 2026
Proof instead of promises
AI agents proved Signal's code. Companies sign numbers that can be checked.
Editorial
Last issue followed the battle for code. This one goes a step further, to the question that comes after any code: how do we know it does what we claim?
On 10 November Google DeepMind said AI agents had mathematically proved key security properties of the real libsignal code, at the machine-code level. The same day Anthropic put numbers into an amended IPO filing that it must stand behind in front of a regulator. OpenAI described a kill switch that stops models within 35 seconds and fails closed. In five days CISA added eleven entries to its catalogue of actively exploited vulnerabilities.
In this issue
Contents
- 04EditorialWhat can be checkedWhy proof is the theme of issue seven.
- 05Cover storyProof instead of promisesFive questions through the issue.
- 06Cover storySignal, proven down to machine codeAlphaProof Code and libsignal.
- 07Cover storySpecification, agents, Lean's kernelHow the proof was built.
- 08Cover storyWhat is proven, and what is notThe limits, from the paper itself.
- 09Cover storyTwo old bugs as an examDoes the spec catch real bugs.
- 10Cover storyYears of work become weeksFrom seL4 to Fermat.
- 11Model watchFable 5.2 and Mythos 5.2: one model, two doorsA cheaper, faster top Claude.
- 12Model watchWhat the numbers show, and whose they areBenchmarks published by Anthropic.
- 13Model watchGemini 4: Carbon for everyone, Hydrogen for speedTwo models in three days.
- 14Model watchAn expensive planner, a cheap workerWhy models are increasingly sold in pairs.
- 15Model watchModels of the weekFive models, with status and price.
- 16WorkAI no longer waits in a chat window.Four days, eight products for business.
- 17WorkClaude gets sheets, boards and dataSheets, Whiteboards and Data.
- 18WorkClaude in the meeting: who may listenMeetings and privacy rules.
- 19WorkAgents inside your perimeterManaged Agents on your own infrastructure.
- 20WorkBusinesses enter ChatGPT, ChatGPT enters AWSBusiness Hub, business agents and AWS.
- 21WorkAgents built for an industryImagine Enterprise and Claude for Manufacturing.
- 22SecurityA kill switch that works when everything else failsOpenAI Control Room.
- 23SecurityWhy the switch sits in the inference layerjob_id, check and fail closed.
- 24SecurityAI finds bugs. So do attackers.OpenSSH, Outlook and Hacktron.
- 25Patch nowPatch immediatelyFour items with confirmed exploitation.
- 26SecurityEleven confirmed attacks in five daysEvery new KEV entry.
- 27SecurityTwo chains: root on a box and a hash from a messageBarracuda and Outlook in detail.
- 28MoneyAnthropic heads to market as ANTRoadshow, price range and S-1/A.
- 29MoneyRevenue grows, but not like this foreverRevenue, loss and customers from the prospectus.
- 30Money900.9 billion dollars of commitmentsWhat Anthropic has already promised to pay.
- 31MoneyCoreWeave: record revenue, record debtQ3 at the largest neocloud.
- 32MoneyNebius: customers pay for the build up frontPrepayments instead of debt, with a delay.
- 33LabA humanoid on the assembly lineGemini Robotics 2.5 and Apollo 2.
- 34LabDexterity, speed and safety around peopleWhat DeepMind measures, and what not.
- 35LabAlphaGenome 2 reads DNA cell by cellFrom tissue averages to single cells.
- 36LabTwice as many causal variantsTenK10K and a gut disease example.
- 37OrbitMoon Base becomes a procurement programmeA 10 billion contract and a nuclear rover.
- 38OrbitA rover that survives the lunar nightPROMISE and radioisotope power.
- 39OrbitContracts arrive, missions slipMoon Base 1, 2 and 3 slip into 2027.
- 40OrbitESCAPADE is on its way to MarsTwo powered Earth flybys succeeded.
- 41BuildSecrets in logs and alerts that switch offGitHub and Vercel this week.
- 42Use thisAn agent a company can trustA four-step guide with TypeScript examples.
- 43Use thisA kill switch that fails closedA check before every model call.
- 44Use thisThe agent never sees the key or picks the addressA proxy with a host allowlist.
- 45Use thisIrreversible waits for a person, everything is loggedApproval and a record of every step.
- 46ShippedArrived this weekWhat is actually available.
- 475 minutesIn briefShort news of the week.
- 48NumbersThe week in numbersSixteen numbers on two pages.
- 49NumbersMore numbers of the week
- 50NextWhat we are watchingDates after the cut-off.
- 51SourcesAll sourcesEvery source, by page.
