📰 Simon Willison's Blog

Given how badly burned anyone who took Apple's 2024 WWDC Apple Intelligence announcements at face value was, I'm holding to a strict "I'll believe it when I see

Microsoft announced two new text LLMs this morning - MAI-Thinking-1 (reasoning, 35B parameters, available to "select early partners") and MAI-Code-1-Flash (5B p

Anthropic shipped Claude Opus 4.8 today. My favourite thing about it is this note in the release announcement: Users will find Opus 4.8 to be a modest but tangi

Anthropic are strongly rumored to be about to have their first profitable quarter. Stories are circulating of companies surprised at how expensive their LLM bil

We just announced the first release of Datasette Agent , a new extensible AI assistant for Datasette. I've been working on my LLM Python library for just over t

How fast is 10 tokens per second really? Neat little HTML app by Mike Veerman ( source code here ) which simulates LLM token output speeds from 5/second to 800/

Release: llm-gemini 0.32 New model gemini-3.5-flash for Gemini 3.5 Flash . See also my notes on Gemini 3.5 Flash , and <a href="https://simonwillison.net/2026/M

TIL: Using LLM in the shebang line of a script Kim_Bruning on Hacker News : But seriously, you can put a shebang on an english text file now (if you're sufficie

Using Claude Code: The Unreasonable Effectiveness of HTML Thought-provoking piece by Thariq Shihipar (on the Claude Code team at Anthropic) advocating for HTML

I'm at Anthropic's Code w/ Claude event in 2026, and I'll be live blogging the keynote and a few other notes throughout the day. Tags: ai , generative-ai , llms

Release: datasette-llm 0.1a7 Mechanism for configuring default options for specific models. Part of Datasette's evolving support mechanism for plugins that use

Release: llm-echo 0.5a0 New -o thinking 1 option to help test against LLM 0.32a0 and higher. This plugin provides a fake model called "echo" for LLM which doesn

Granite 4.1 3B SVG Pelican Gallery IBM released their Granite 4.1 family of LLMs a few days ago. They're Apache 2.0 licensed and come in 3B, 8B and 30B sizes. G

I just sent out the April edition of my sponsors-only monthly newsletter . If you are a sponsor (or if you start a sponsorship now) you can access it here . In

Our evaluation of OpenAI's GPT-5.5 cyber capabilities The UK's AI Security Institute previously evaluated Claude Mythos : now they've evaluated GPT-5.5 for find

I just released LLM 0.32a0 , an alpha release of my LLM Python library and CLI tool for accessing LLMs, with some consequential changes that I've been working t

microsoft/VibeVoice VibeVoice is Microsoft's Whisper-style audio model for speech-to-text, MIT licensed and with speaker diarization built into the model. Micro

Chinese AI lab DeepSeek's last model release was V3.2 (and V3.2 Speciale) last December . They just dropped the first of their hotly anticipated V4 series in th

This week's edition of my email newsletter (aka content from this blog delivered to your inbox) features 4 pelicans riding bicycles, 1 possum on an e-scooter, u

GPT-5.5 is out . It's available in OpenAI Codex and is rolling out to paid ChatGPT subscribers. I've had some preview access and found it to be a fast, effectiv

OpenAI released ChatGPT Images 2.0 today , their latest image generation model. On the livestream Sam Altman said that the leap from gpt-image-1 to gpt-image-2

Claude Token Counter, now with model comparisons I upgraded my Claude Token Counter tool to add the ability to run the same count against different models in or

Anthropic are the only major AI lab to publish the system prompts for their user-facing chat systems. Their system prompt archive now dates all the way back to

Thanks to a tip from Rahim Nathwani , here's a uv run recipe for transcribing an audio file on macOS using the 10.28 GB Gemma 4 E2B model with MLX and mlx-vlm :