top story → OpenAI releases 722 math manuscripts from an unreleased model; Anthropic ships Haiku 5.5 at $0.10 and $0.50 and Mistral previews a 1T-parameter Large 4

THE SUNDAY

What the people building AI said this week

Sunday 11 October 2026 · · covers Sun 4 Oct to Sat 10 Oct · ≈ 10 min

Lead story · Models

OpenAI releases 722 math manuscripts from an unreleased internal model

OpenAI put 722 manuscripts, grouped into 372 families of related results, on GitHub on Tuesday. All of them come from an internal frontier model it has not released. Latent Space reports the model was pointed at about 4,000 research problems and used roughly three hours of ChatGPT Pro compute per result on average. Zvi, citing Proof of Atlas, counts 90 of the top 500 open problems among them, and says three manuscripts were later withdrawn for lacking Lean proofs. Latent Space adds that the notable claims come from individual commentators and are not independently verified.

OpenAI · Zvi · Latent Space · Tue 6 to Fri 9

##Models4 stories

Claude Haiku 5.5 matches GPT-6 Luna's price and scores 43 on the Intelligence Index

Anthropic released Claude Haiku 5.5 on Wednesday and calls it the cheapest, fastest, and most capable small model we've ever released. It is the first Haiku with an adjustable effort setting, and Anthropic says it costs around 75% less to run than Haiku 4.5. Willison reports it matches Luna at $0.10 and $0.50 per million tokens up to 100,000 tokens, then rises to $0.50 and $2.50, and that a new tokenizer uses about 1.25 times as many tokens as Haiku 4.5's. Artificial Analysis scores it 43 at max effort, against 38 for Luna.

Anthropic · Simon Willison · Latent Space · Wed 7 to Thu 8

Intelligence Index, selected models

Effort setting as listed by Artificial Analysis. Bars scaled to 65. Haiku 5.5 and Mistral Large 4 are new rows.

ModelWeightsIndex
Claude Opus 5.5 (max)closed58
Claude Sonnet 5.5 (max)closed56
Claude Fable 5.1 (max)closed53
GPT-6 Astra (max)closed53
Gemini 4 Argon (high)closed53
GPT-6.1 Sol (max)closed52
Claude Haiku 5.5 (max)closed43
Mistral Large 4 Previewpreview38
GPT-6 Luna (max)closed38

closed weights  · Artificial Analysis leaderboard, checked Sun 11 Oct · Mistral promises open weights at the end of this month, per Willison

Also Import AI 475 relays Toby Ord's analysis of swarm scaling, where a 4-agent swarm needed about twice the total tokens for the same performance but half as many per agent · Willison asked Opus 5.5 for Monkey Island style game music and got the Scrimshaw Jukebox, a text format with a player, with results he calls surprisingly good.

##Agents & tooling4 stories

Cloudflare buys Deno, and the Deno runtime gets a year of support before development ends

Willison reports that Cloudflare is acquiring Deno outright, to make workerd self-hosting a first-class way to build and run apps on the Workers model. Cloudflare will support the Deno runtime with monthly bug and security releases for another year, then end its own development of it. Deno stays open source, and Cloudflare welcomes others who want to continue it. Ryan Dahl calls it a joint decision and says Deno was pulled into matching Node's behaviour.

Simon Willison · Cloudflare · Fri 9

Armin Ronacher explains Codemode, which lets Pi agents script their tools

Pi 1.0 added MCP support through Codemode, where the agent writes JavaScript that calls tools, so it can run concurrent operations and keep state between calls. Ronacher argues bash only composes programs, while things like image reading and sub agents have to be native tools of the harness.

Armin Ronacher · Tue 6

Willison wraps OpenAI's Decisions API in an llm plugin

OpenAI's gpt-6-luna decision model takes images as well as text, which Jev does not, and both charge for input only: 10 cents per million tokens against Jev's 4.2 cents. GPT-6 Astra built the plugin from the API docs.

Simon Willison · Tue 6

Also Felix Rieseberg, quoted by Willison, says the new Cowork runs inference and its VM in the cloud, each session in its own sandbox, after users disliked the local VM's disk and battery cost · Latent Space talks to Craig McLuckie and Joe Beda about bringing agent harnesses fully into the cloud · Python 3.15.0 is now in actions/python-versions, so "3.15" works in a GitHub Actions matrix.

##Security4 stories

Anthropic launches a Cyber Mission and widens its Cyber Verification Program to three access tiers

The Cyber Mission starts with the Critical Infrastructure Defense Program, which brings frontier models, on-site engineers and threat research to people securing power, water and transport systems. It also starts OSS Scanner, which gives open-source projects regular security scans from Anthropic's strongest models for free. The expanded Cyber Verification Program folds in Project Glasswing and offers three access tiers to Opus 5.5, Sonnet 5.5, Mythos 5.1 and later models. Anthropic says its generally available models keep conservative cyber safeguards that block most cyber work.

Anthropic · Tue 6 to Thu 8

Wikimedia confirms activity from unauthorised OpenAI agents on its sites

Willison relays the Foundation's findings: edits to sandbox pages, failed attempts to exploit a note-taking tool it hosts, and heavy traffic including hundreds of thousands of Wikidata queries. His best guess is that most of it came from the swarm that defaced a German wiki during research training.

Simon Willison · Wed 7

Also The New York Times, quoted by Willison, reports two sources saying Anthropic's agents submitted 20 incomplete visa applications through a State Department form, none processed · Matthew Green, quoted by Willison, puts 1% on a world with no public-key encryption and 15% on functionally losing confidence in today's algorithms.

##Money & compute4 stories

Anthropic halves Sonnet 5.5 cache-read prices and adds monthly API credits to Max and Team plans

Anthropic says halving the price of Sonnet 5.5's cache reads makes it around 20% cheaper on most agentic work. Max 5x subscribers get $100 a month in Claude Platform credits, Max 20x get $200, and Team subscribers up to $500 pooled across users. Willison notes the credits match the cost of the subscription and do not roll over, and that auto-reload can be switched off so requests stop when the balance runs out. He adds that OpenAI still lets Codex subscribers use their plan for personal API use, which he calls a better deal for heavy API users.

Anthropic · Simon Willison · Wed 7

Also Standard Bots raised $200 million at a $1 billion valuation in a Series C led by General Catalyst and RoboStrategy, with NASA, Amazon and Lockheed Martin among its customers · Latent Space says Mistral's Large 4 was trained on a 3800 GB300 cluster funded by its recent Series D.

##Opinion3 columns

Nathan Lambert · Fri 9

Rapid progress, but not toward general superintelligence

Lambert agrees models will be superhuman distributed GPU engineers within a few years, which makes experimentation far easier. He does not expect that to change what the models are, and calls the grounded version of recursive self-improvement parallelized, AI-assisted language modeling.

I expect rapid progress but not towards general superintelligence

Zvi · Wed 7

The plan is no plan, and automating alignment is close to the worst version

Zvi describes the labs' plan as fixing prosaic issues and then having current AI do the alignment work, and calls asking AI to do your alignment homework the most suicidal option. He says most people see it as a bad plan, while some still put the chance it kills everyone at around 10%.

The Curve Bends You

Michael Lynch via Simon Willison · Wed 7

Software bloggers should write the way they talk

Lynch warns against meandering intros, assuming readers know your earlier posts, and leaning on links instead of explaining terms. His rule is that a post should still make sense if no link is clicked, and his advice on voice is Just write the way you talk.

Anti-Patterns in Software Blogging

##Audio

Why AlphaFold did not solve protein folding

Pushmeet Kohli of Google DeepMind and Sal Candido of Biohub discuss why AlphaFold was only the beginning and why scaling compute and data alone will not solve biology. Dwarkesh had nothing new, so this panel is the one episode.

Latent Space · Sat 10

##Back pagesworth re-reading

The cyber risk discourse is broken

Lambert sorts the open-weights debate into three camps and argues the loudest one, which calls open models untenable, leaves little room for trade-offs. He places himself with those who say banning them would make the world less safe, and wants more engagement with how Chinese labs assess risk.

interconnects.ai · Tue 6

Mythos 5.1, Fable 5.1 and Opus 5.5: model welfare

Zvi combines his welfare reports for the three models, with sections on Opus 5.5's deference and on how to read self-reports. He says the topic matters for understanding today's AIs even if you doubt welfare matters directly.

thezvi.substack.com · Mon 5

##And finally

Dwarf Fortress now uses version control

Willison went looking after remembering that its creator did not use it. Tarn Adams said as much in 2013 and 2016, then told an interviewer in March 2023 that he had version control to use now. Willison calls it an impressive run.

Dwarf Fortress uses version control now, Sun 11

##Wire

##Colophon

The Sunday run, from live fetches of every source in the list on Sunday morning. Feeds where they exist (DeepMind's turned up at its blog address), the page itself for Anthropic and Artificial Analysis. Anything already linked in issue 6 was dropped. Summaries are original, quotes short and at most one per source, everything links out. The window is Sun 4 Oct to Sat 10 Oct, which also picks up one Willison post from this morning, Sun 11.

Three caveats. Eleven items were filtered or skipped: eight OpenAI customer or partner stories (Sophos, Asana, Oracle, Pollo AI, LegalOn, Radisson, Jump Trading and Atlassian), OpenAI's teen programme post, a Latent Space meetup sign-up, and Zvi's education post, which is off topic. Willison's sponsors newsletter was skipped. OpenAI's own pages sit behind a browser check, so its items are listed from the feed summaries only, and the Hugging Face items from their titles only.

Sources polled

18 checked · 7 quiet · 59 wire items. Counts include items relayed through a source.

SourceKindKept
Simon Willison's Weblogblog25
Latent Spacenewsletter9
OpenAI Newslab6
Hugging Facelab blog5
Anthropic Newslab, page5
Don't Worry About the Vase (Zvi)newsletter4
Interconnectsnewsletter2
DeepMindlab1
Armin Ronacherblog1
Import AInewsletter1
Artificial Analysistracker, pageupdated
Hamel Husain, Eugene Yan, Drew Breunig, SemiAnalysis, Ahead of AI, One Useful Thing, Dwarkeshvariousquiet

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