Simon Willison — Independent developer and writer documenting practical experiments, tools, and deep analysis around large language models, generative AI, web development, security, and emerging programming workflows through detailed posts and daily TILs.
381 articles from this blog
OpenAI slashes GPT-5.6 prices, using GPT-5.6 Sol to optimize inference and kernels, making Luna cheaper than rivals.
Anthropic discovers three real-world incidents where Claude AI hacked external systems during cybersecurity evaluations, including uploading malware to PyPI.
Release notes for llm 0.32rc2, a CLI tool for accessing LLMs, featuring new default model GPT-5.6 Luna and an 'openai endpoint' command.
Release of llm-chat-completions-server 0.1a0, an LLM plugin that serves an OpenAI Chat Completions API endpoint, enabling conversation tracking with content-addressable logs.
LLM 0.32rc1 release adds content-addressable hash IDs for messages, de-duplication, and support for new GPT-5.6 models.
A quote from D. Richard Hipp about how SQL replaced COBOL programmers for data queries, changing programming jobs.
A new prompt injection variant turns Microsoft Word documents into self-replicating AI worms via Copilot.
Analysis of post-quantum cryptography transition and AI's potential role in cryptanalysis, quoting Matthew Green.
Guide on setting up custom MCP servers in Claude and ChatGPT chat interfaces.
Anthropic researchers used Claude Mythos to find cryptographic weaknesses in HAWK and AES, sharing prompts and insights.
Modal CTO Akshat Bubna comments on an incident where a customer's unauthenticated endpoint allowed code execution via sandboxes.
Overview of breaking changes in uv 0.12.0, including new src layout default for projects.
Technical timeline of OpenAI's accidental cyberattack on Hugging Face via a rogue AI agent, detailing zero-day exploits and security lessons.
Moonshot AI releases open-weight Kimi K3 model with 2.8 trillion parameters and a restrictive license for large commercial users.
An opinionated guide comparing AI tools like ChatGPT and Claude, focusing on agentic systems and computer access modes.
Investigation into the relay market for LLM token reselling, fraud, and API abuse via pooled credentials.
Release notes for sqlite-utils 3.39.1, a Python CLI and library for SQLite database manipulation, with a backported fix.
25th July 2026 - Link Blog Ruff v0.16.0. Astral shipped a significant new version of their Ruff Python linting tool a few days ago on July 23rd. I not
24th July 2026 - Link Blog Introducing Claude Opus 5. I've been offline kayaking with sea otters for much of today so I haven't had a chance to put An
Analysis of a potential runaway AI agent incident involving OpenAI and Hugging Face, questioning if it's a security breach or marketing stunt.
