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Simon Willison’s Weblog

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  • Claude Haiku 5.5

    As previously promised, here's Anthropic's new fast, low cost model: Introducing Claude Haiku 5.5. The previous Haiku, 4.5, was very much showing its age.

    Simon Willison4 min read

  • Anti-Patterns in Software Blogging

    Anti-Patterns in Software Blogging Some excellent writing advice from Michael Lynch. Michael warns against "meandering intros", misjudging your reader's existing knowledge, assuming they'll read your previous posts, and excessive formality.

    Simon Willison2 min read

  • Quoting Jake Boggan

    I was a graph theory junkie long ago and even moved to Budapest for awhile to study among the greats. While I was there I started working on Barnette's Conjecture which came to occupy my thoughts over the next 24 years of my life, on and off as I worked in many different fields.

    Simon Willison1 min read

  • OpenAI “rogue” agent activities found on Wikimedia projects

    OpenAI “rogue” agent activities found on Wikimedia projects Given how tempting a target wikis are for rogue agent swarms, it's not a huge surprise that Wikipedia found evidence of that activity once they went looking: The Wikimedia Foundation conducted its own investigation to see whether Wikimedia…

    Simon Willison2 min read

  • Quoting Victoria Kim

    Since the Medicare breach, OpenAI has put in place additional monitoring to allow “immediate intervention” by staff to stop training if the company’s models access the internet in ways they’re not supposed to, Mr. Kwon [chief strategy officer at OpenAI] said.

    Simon Willison1 min read

  • llm-openai-decisions 0.1a0

    Release: llm-openai-decisions 0.1a0 OpenAI released their new Jev-style Decisions API, as previously announced at last week's DevDay. Since I already have an llm-typesafe plugin for talking to Jev, I had GPT-6 Astra read the new OpenAI API documentation and build an llm-openai-decisions plugin…

    Simon Willison2 min read

  • llm-mistral 0.16

    Release: llm-mistral 0.16 Adds support for reasoning models, such as the newly released Mistral Large 4. Tags: llm, mistral, llm-reasoning

    Simon Willison1 min read

  • EmbeddingGemma 2

    My comment on EmbeddingGemma 2 — Hacker News.I really appreciate that EmbeddingGemma 2 is under the Apache 2.0 license. For embedding models in particular, I don't think it makes sense to use a closed, proprietary, hosted-only model.

    Simon Willison2 min read

  • Introducing Mistral Large 4: Le chonk

    Introducing Mistral Large 4: Le chonk Mistral are back in the game. Today they're releasing a preview of Mistral Large 4, a 1 trillion parameter, 49 billion active parameter model trained on their own cluster of 3,800 NVIDIA Grace Blackwell GPUs. The preview is available via their API.

    Simon Willison2 min read

  • Using Parseable with Datasette for OpenTelemetry traces

    TIL: Using Parseable with Datasette for OpenTelemetry traces I saw Parseable in a Show HN today - it's a new observability platform with both an open source (AGPL) Rust implementation (a single ~180MB binary), an "Enterprise" version with extra features and a cloud hosted option.

    Simon Willison1 min read

  • Mistral Large 4

    My comment on Mistral Large 4 — Hacker News. wren6991: The benchmark is saturated. Frontier models are tested with an armadillo in fishnet tights jaywalking on Mars.

    Simon Willison1 min read

  • datasette-atom 0.11a0

    Release: datasette-atom 0.11a0 A minor fix for compatibility with the latest Datasette alphas. This meant we could upgrade the datasette.io site to Datasette 1.0a41. Tags: atom, datasette

    Simon Willison1 min read

  • Scrimshaw Jukebox

    Tool: Scrimshaw Jukebox I wanted to see if Claude Opus 5.5 could compose music, so I tried this: I want you to write some computer game music for me. First design simple text based format for the music and build an artifact that can play it out loud - include some example tracks in that artifact I…

    Simon Willison2 min read

  • Quoting Felix Rieseberg

    The "old" version of Cowork runs model inference in the cloud, executing tool calls in an Anthropic-provided VM we shipped to your computer. We added the VM for capability, safety, and security reasons - mapping in just the data you explicitly added to your session.

    Simon Willison2 min read

  • Qwen3.8 27B addition in words

    Research: Qwen3.8 27B addition in words Colin Frasier posted on Bluesky about an experiment he ran over two years ago using GPT-4o to see how well it could "compute the sum but return the answer in words" across increasingly large numbers.

    Simon Willison2 min read

  • September sponsors-only newsletter

    I just sent the September edition of my sponsors-only monthly newsletter. If you are a sponsor (or start a sponsorship now) you can access it here. This month: More Fable class models A pricing war 3D graphics, Blender, and pixel art LLMs come for mathematics So many more accidental cyberattacks…

    Simon Willison1 min read

  • Rex's Dino Store

    Museum: Rex's Dino Store Located just before the turnstiles in the Grand Army Plaza subway station at the north end of Brooklyn's Prospect Park is this former newsstand which is now operated by a dinosaur. The density of dinosaur puns is exceptional. Tags: art, new-york

    Simon Willison1 min read

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