Calls, puts & mise en place

Appel & Mise

Vol. ITuesday, September 29, 2026 · 59° & cloudy on the UWSThe daily, for Jeremy Ettlinger

BTC$84,160+0.8%ETH$2,716+1.0%S&P 5007,684-0.8%

The lede

Introducing Claude Sonnet 5.5

Anthropic

The headline number is the one that matters for anyone running a fleet: 70.6% on Terminal-Bench 4.0 against Sonnet 5's 10.3%, two points off Opus 5.5 on GDPval-AA, at the same $2/$10 per million tokens but typically needing far fewer of them — Anthropic's own testing puts it up to 30% cheaper per task and 30%+ faster. The quieter news is that it ships with the cyber safeguards previously reserved for the top of the family, because its security capabilities now match Opus 5's, and that it is the model behind the free tier on claude.ai, which is a more interesting competitive move than any of the bars on the chart.

AI & Agents

Matt Taylor and Samuel Macleod, Cloudflare · made the Sunday

Introducing cf: the agentic CLI for the entire Cloudflare API

The number that justifies the whole project: agent use of Wrangler went from single digits last year to a quarter of all use in March to 48% last week, and agents use nearly twice as many distinct commands per day as people do. So Cloudflare generated a new CLI straight from its OpenAPI schemas, taking coverage from Wrangler's hand-built ~280 operations to over 3,000, with JSON as the default output and a search command so an agent can find a verb instead of guessing at one. If you have a wrangler.jsonc in a repo you are not being asked to move yet — but cloudflare.config.ts, TypeScript-typed and Vite-by-default, is clearly where this is going.

Web & Product Craft

Ryan Townsend and Nic Jansma, Cloudflare

How fast is the web? Explore billions of real-user measurements with BEACON

Cloudflare has published the anonymized real-user timings behind 10,000 of the largest sites on its network as full Core Web Vitals histograms rather than a single P75, updated daily in BigQuery, which means you can finally go look at the long tail instead of arguing about it. The findings are a useful corrective to building on a fast laptop: WebKit wins overall but is at least 10% worse than Blink on LCP, INP or both in 46 countries where it holds real share, and in Cambodia its LCP is 50% worse. The LCP and INP sub-parts are the part to steal — they tell you whether the problem is TTFB, JavaScript hiding the candidate, bandwidth, or something blocking the paint.

James Anderson and Matt Taylor, Cloudflare

Next.js applications, powered by Vite: introducing Vinext 1.0

In February this was one engineer and a stack of tokens spending a week seeing how much of Next.js could be rebuilt on Vite; seven months later it is 1.0, above 99% test compatibility on the features customers actually ask for, running the Next.js end-to-end suite nightly to catch upstream drift. The engineering lesson is the honest one buried mid-post: writing an import named revalidatePath is trivial, and making it affect the rendered page, the cache entry and every future request the way the original does is the entire job. Worth reading even if you never touch Next, because it is a clear account of what compatibility costs once you promise behavior rather than API surface.

New York & the Table

King Arthur Baking

What is high-extraction flour, exactly?

Extraction rate is simply how much of the original grain survives milling — whole wheat is 100%, white is well below, and high-extraction sits around 80 to 90%, which is what the French T85 label on King Arthur's new Baker's Reserve bread flour means. The reason it is worth a bag of counter space is the trade it makes: enough bran and germ for flavor and color, not so much that you lose gluten development or an open crumb, and the minerals that come with them measurably wake up a sourdough starter.

Diversions

Eli Burnstein, Literary Hub

What Gertrude Stein, T. S. Eliot and Joan Didion Really Meant With Their Most Famous Aphorisms

An excerpt from Burnstein's new book on literary catchphrases, and the Stein entry earns the whole piece: the line was originally 'Rose is a rose is a rose is a rose,' and his reading is that she is deliberately breaking out of the X is Y of ordinary description into pure X is X — last stop on the train of language, real life from here. Pleasant to have someone take the most quoted and least explained sentences in English seriously enough to explain them.

Loose Change

Patrick Fitzsimmons, Works in Progress · made the Sunday

Why the Bronze Age collapsed

Fitzsimmons starts by pointing out that the usual suspects — drought, famine, the Sea Peoples — explain upheaval but not permanence, and that the real puzzle is why nothing resembling Egypt or the Hittites came back for centuries afterward. His answer is metallurgical: bronze needs tin, tin came from mines thousands of miles away in Afghanistan or Western Europe, and that supply chain is exactly what kept good weapons in the hands of palaces and armies. Iron could be smelted more or less anywhere, so an ordinary farmer could hold something as good as a soldier's, and the arrangement that made empires possible never reassembled.

The Back Page

The Guardian

Arsène Wenger and Arsenal: 30 years on from appointment that changed English football

Thirty years ago tomorrow David Dein confirmed a manager whose name drew an unprintable question from one of his own players, and whom the Evening Standard billboards reduced to 'Arsène Who?'; the precedent everyone had in mind was Jozef Venglos at Villa, foreign and academic and an utter failure, which suited the sceptics fine. Wenger inherited a dressing room he called culturally English, signed two unknown Frenchmen in Vieira and Garde, and by the time he left in 2018 every squad in the league looked like his did. Ferguson's line that he knew nothing about the English game aged about as well as those billboards.

Around town

Sun Oct 4 · 9:30am

CAST-GNY Startup Pitch Competition

Fordham School of Law, 150 W 62nd St, Lincoln Square

A Sunday morning of lightning pitches and judges' questions twenty blocks from the front door, free, done by early afternoon. The grand prize is a Mac Mini, which tells you the register — early founders, not a conference.

professional

Tue Oct 6 · 6:00pm

Tech x Market Decoders: Let's Talk About Jev

Venue given on registration, Manhattan

Fifteen minutes of everyone reading in silence, then forty-five of arguing about what they found — this week on the decision-model shape that arrived three weeks ago and that nobody has a settled read on yet. Ten dollars, bring a laptop, and the format is the point.

professional

Fri Oct 9 · 7:15pm

My Undesirable Friends: Part II — Exile

Film Forum, 209 W Houston St, South Village

Julia Loktev follows the young Russian journalists of her last film out of Moscow and across a dozen countries as they keep reporting from Istanbul, Tbilisi, Prague and Vienna under death threats and an extremist designation. Opening night is chapters one to three with Loktev introducing; the whole thing runs 355 minutes, so this is the sensible way in.

casual

Opens Fri Oct 16

Once Upon a Time in Harlem

Film Forum, 209 W Houston St, South Village

In August 1972 William Greaves filmed a reunion of Harlem Renaissance figures — Romare Bearden, Eubie Blake, James Van Der Zee, Aaron Douglas — in Duke Ellington's townhouse on St. Nicholas Avenue, and never finished the film before he died in 2014. His son David cut the footage together and it has just won the Library of Congress's Lavine/Ken Burns prize; a Greaves centennial series follows on the repertory screen October 23–29.

casual

Quote of the day

“Agents love CLIs.”

— Matt Taylor and Samuel Macleod, Cloudflare

On this day

September 29, 1954 — the twelfth founding government ratifies the CERN convention and the lab opens outside Geneva, thirty-five years before one of its staff programmers circulates a memo about linking documents.

The puzzle corner

The Mini · Wordle · Connections

Cloudflare says half its CLI traffic is now agents; Works in Progress says empires end when the good tools stop being scarce.