Calls, puts & mise en place

Appel & Mise

Vol. IThursday, October 8, 2026 · 59° & clear on the UWSThe daily, for Jeremy Ettlinger

BTC$83,100-0.8%ETH$2,567-1.1%S&P 5007,802-0.2%

The lede

The Mathocalypse

Scott Aaronson

On Tuesday OpenAI released 372 mathematical results produced by an unreleased internal model, among them a proof of Subhash Khot's Unique Games Conjecture with a Lean certificate attached, and Aaronson — who is not easily stampeded — calls it one of the biggest days in mathematical history. The mechanics are the part to read closely: roughly four thousand problems attempted at about three hours of ChatGPT Pro-level compute each, a hit rate on the broad list near 5%, and proofs written badly enough that the mathematicians checking them are using AI to help read them. The list underneath is what will unsettle anyone who has taken a complexity course — L = BPL, integer multiplication below O(n log n), matrix multiplication at O(n^9/4), parity not in QAC0, a 2D area law for gapped Hamiltonians. Aaronson's conclusion is not triumphalism but a change of category: mathematics may now work more like an empirical science with the model as a telescope, and the community's job is to keep digesting output it did not generate. He also notes the one conspicuous absence from the release, which is cryptography, and draws the obvious inference about where labs are probing quietly.

AI & Agents

Anthropic

Claude Haiku 5.5

The first Haiku-class model with an effort dial (Low through Max), at $0.10 in and $0.50 out per million tokens under 100k of prompt, a cent per million on cache reads, and roughly 75% cheaper to run than Haiku 4.5. The benchmark pair that should decide how you wire it up is 72.4% on OSWorld against Haiku 4.5's 15.7%, and 39.2% on Terminal-Bench 4.0 against Sonnet 5.5's 70.6% — which is Anthropic saying plainly that this is the model for compaction, classification, summaries and subagent legwork, and not the one to hand a hard refactor. Asana is reporting over 30% lower task-completion latency and Box about half the latency of 4.5, which is the kind of change that alters what you are willing to put in a loop.

Terence Tao

Math 2.0 will need to value mathematical progress more holistically

Posted the same day as the OpenAI release, and the sharpest account of what actually gets damaged. Tao's argument is that the value of a breakthrough was never only the proof: it was the talks, the workshops, the followup problems, the collaborations, and the junior people who joined a field because something exciting happened in it — and that none of that is generated when a problem is solved by a prompter with no interest in the field and no ability to answer a question about the output. The line that lands is the irreversibility: a solved problem cannot be returned to unsolved, and even knowing that a solution exists contaminates the search for a better route to it, so fields are being left less fertile than if a human had got there first. He is not arguing against the tools — he thinks they can support exposition and community building too — but he wants the criteria for publication, education and careers rewritten to say so.

Engineering & Leadership

MIT News · made the Sunday

Margaret Hamilton, computing pioneer, dies at 90

She died on September 30, having led the onboard flight software for the crewed Apollo missions and coined the term software engineering specifically to argue that the work deserved the word — a claim she said was treated as a joke at the time. Every engineer knows the Apollo 11 1202 alarm, where her priority-driven scheduler dropped background tasks under an overload and let the landing continue, but the better story is the one before it: her four-year-old daughter crashed the command module simulator by starting the prelaunch program mid-flight, Hamilton proposed a software guard against it, and she was overruled on the grounds that the astronauts were too well trained to make that mistake. Jim Lovell made it on Apollo 8 and wiped the navigation data. The fix went in afterwards, which is the entire argument for defensive programming compressed into one incident.

Web & Product Craft

Chrome for Developers

Shipping JPEG XL in Chrome

Chrome 155 ships JPEG XL decoding, four years after Chrome dropped it, and the format's claimed 30–50% advantage over JPEG plus lossless JPEG transcoding is not the interesting half. The interesting half is that Google wrote a new decoder from scratch in Rust — jxl-rs — rather than ship libjxl behind a sandbox, stabilizing Rust's target_feature_11 to get SIMD without unsafe code and building a Highway-inspired abstraction layer so the unsafe parts live in a handful of vetted places. They report no memory-safety bugs in the implementation's history, which is a useful citation the next time someone argues that process isolation is sufficient.

Michael Lynch

Anti-patterns in software blogging

Six failure modes, and the two with real teeth are assuming the reader knows everything you know except this one thing, and leaning on links instead of explaining — if a term is defined by a link to a twenty-thousand-word FreeBSD chapter, it is not defined. Lynch also counts preamble as meandering, which is the unpopular version of the advice: the subtitle, the bio, the hero image and the famous quote all spend the same attention the bad first paragraph would have spent. His last one is the least glamorous and probably the most common, since 25% of his readers are on phones and a wide code block makes a post unreadable for all of them.

New York & the Table

Mia Romanoff, West Side Rag

Slow Sips: a post grad's guide to Upper West Side cocktail bars

A 22-year-old who works Friday and Saturday nights went looking for the cocktail bars the neighborhood is supposed not to have, and came back with four: Sipsteria and its Georgian wine list at 98th, the TV-free Nobody Told Me at 107th, the red basement speakeasy Scarlet Lounge at 83rd, and Velvet Cowboy, the new Pickle Hospitality room at 85th with the disco ball and the $15 Range Rickery. Her conclusion is the practical one — $17 to $20 is West Village pricing, and the claim that The Owl's Tail is the only cocktail bar up here does not survive a Tuesday night of checking.

West Side Rag

Multiple barn owls possibly spotted in Upper West Side building courtyard

The rare barn owl from last weekend now appears to have company. A couple on West 76th between Central Park West and Columbus watched flyovers from their back patio for half an hour on Tuesday night, and reconciling photo timestamps afterwards put the count at four or five birds, with two and possibly three together on a water tower. Parks calls a single barn owl extremely rare in the city; the owl people point out they mate for life and can raise broods of six to eight in a good year, and that they specialize in rats — which is as neat an explanation as you will get for what they are doing on the Upper West Side.

Diversions

Chris Person, Aftermath

Titanfall 2 VR is so good it feels like playing it for the first time

CircuitLord's PCVR conversion of the 2016 campaign, which Person rates the best VR experience since Half-Life: Alyx, and the detail that sells it is how much friction was left in on purpose: you eject a magazine, pull a fresh one off your backpack and cock the gun with your off hand, and the Kraber makes you reach over the barrel to work the bolt between every shot. Holographic sights have real depth and real optics cast shadows that make aiming harder; in the mech your hands track your hands and BT's track the pilot's, which Person says finally vindicates Steel Battalion. The launcher installs the Northstar framework itself and it runs on anything tethered to a PC, which is the whole argument for moddable platforms in one download.

Loose Change

Gary Linscott · made the Sunday

How machines learned precision

An account of how English machine shops between 1769 and the 1850s bootstrapped accuracy out of nearly nothing, and the pleasure of it is in the self-correcting tricks. Watt's first test cylinder was off by three eighths of an inch between its widest and narrowest diameters; by 1776, with Wilkinson's boring mill holding the cutter bar at both ends so it had no choice but to travel straight, a fifty-inch cylinder came in true to the thickness of an old shilling. Maudslay got his first accurate lead screw by joining two bad ones with a bar so their errors averaged out, and the three-plate method produces a genuinely flat surface from three rough plates with no master to copy, for the simple reason that two domed plates cannot fit each other. Whitworth's machine of the 1850s resolved a millionth of an inch — he read it off whether a small weight fell or stayed put — and he noticed in passing that a yard of steel grows measurably when you hold it with a finger.

The Back Page

David Pasztor, We Ain't Got No History

Estêvão and Jorrel Hato among 25 finalists for Golden Boy award, once again

Both on the under-21 shortlist for the second season running, which is the sort of honour that decides nothing and still tells you something about where the squad is. Barcelona have taken three of the last four through Pedri, Gavi and Yamal, nobody is eligible twice, and this year's field looks genuinely open — neither Chelsea player is a favourite, but Estêvão has a couple of years of eligibility left and no Chelsea player has ever won the thing.

Ed Aarons, The Guardian

Mikel Arteta's new contract reflects where the power now lies at Arsenal

Arteta has signed to 2030 on a reported £20m-plus a season, making him the best-paid manager in the league and, on Aarons's reading, the person who decides most things at the club — including the decision against expanding the Emirates, after he raised what a temporary move to Wembley would do to the squad. He also had the final say on not pursuing a forward in the last days of the window, so that Max Dowman would get minutes, which may look different now that Tzolis has a hamstring. Aarons makes half the case through the training-ground labrador, which sounds like a joke and is exactly the point: Arteta chose the dog, took her home for Christmas, and the club shop sells a plush version.

Around town

Thu Oct 8 · 6:00pm

Building at the Frontier: Hypergrowth Startup Operator Panel

Columbia University, 116th & Broadway, Morningside Heights

Four people doing the actual work at AI-frontier companies — an engineer at Cognition, technical staff at Rogo, marketing at Antimetal, business operations at Tennr — talking about what the inside of a hypergrowth company feels like across engineering, research, strategy and brand. It is pitched at students deciding where to go after graduation, which makes it an unusually candid room: nobody is selling to anybody. Free, tonight, and a walk up Broadway.

professional

Thu Oct 8 · 7:00pm

CelEBBration: A Concert of Fred Ebb Award Winners

Peter Jay Sharp Theatre, Symphony Space, 2537 Broadway at 95th, Upper West Side

Ten years of Fred Ebb Award recipients — the prize that goes to musical-theatre songwriters before Broadway has heard of them — with their songs performed by a two-dozen-strong cast including Santino Fontana and Darius de Haas, hosted by Karen Ziemba. Michael R. Jackson and Shaina Taub are on the bill, which is a fair demonstration of what the award spots. Two and a half hours, from $20 with a student ID and $34 without, nine blocks away.

casual

Sat Oct 17 · 4:00pm

Context Engineering Guild: October Edition

111 Conselyea St, Williamsburg, Brooklyn

A monthly meetup that states plainly it is not for first-time coders: a lecture on the last month of tooling and capability changes, then guided discussion, and you bring your actual working laptop so people can show each other how they build rather than describe it. That format is rare and it is the right one for a subject moving this fast. Free, and the one listing this fortnight aimed squarely at someone already deep in it.

professional

Tue Oct 20 · 7:00pm

Assets & Access NYC @ Pubkey

Pubkey, 85 Washington Pl, Greenwich Village

A founder, operator and investor meetup in the Bitcoin bar on Washington Place, run by Introduction.com but open to anyone who registers. No agenda and no speakers listed, which is the honest version of this format — it is a room, and the value is who is standing in it. Free.

professional

Wed Oct 21 · 7:00pm

Selected Shorts: The Best American Short Stories 2026 with Viet Thanh Nguyen

Peter Jay Sharp Theatre, Symphony Space, 2537 Broadway at 95th, Upper West Side

Nguyen guest-edited this year's Best American Short Stories and hosts the live reading of three of them — Nathan Blum, Sigrid Nunez and Akhil Sharma — performed by Sanjit De Silva, Jessica Hecht and Denis O'Hare. Hearing a short story read by an actor who has rehearsed it is a different transaction from reading it, and 105 minutes with no intermission is the right length for it. Twenty minutes up Broadway, from $19.

casual

Quote of the day

“Apparently the greatest open problems of theoretical computer science are indeed pretty hard!”

— Scott Aaronson, on a success rate of roughly 5%

On this day

October 8, 1956 — Don Larsen throws the only perfect game in World Series history, Yankees over the Dodgers at Yankee Stadium, and gets it done in two hours and six minutes. The same date in 1871, the Great Chicago Fire starts in a barn on DeKoven Street.

The puzzle corner

The Mini · Wordle · Connections

Two of today's items describe the same week in mathematics from opposite ends, and the disagreement between them is not about whether the proofs hold. Aaronson wants the community to adapt to a telescope it did not build; Tao points out that a field is a community rather than a list of solved problems, and that the harvest is spending something nobody was keeping accounts of.