Tootfinder

OpenAI quietly adopted Anthropic's "skills" mechanism in ChatGPT and Codex; ChatGPT's skills include creating and modifying spreadsheets, docx files, and PDFs (Simon Willison/Simon Willison's Weblog)
https://simonwillison.net/2025/Dec/12/openai-skills/

OpenAI are quietly adopting skills, now available in ChatGPT and Codex CLI
One of the things that most excited me about Anthropic’s new Skills mechanism back in October is how easy it looked for other platforms to implement. A skill is just …

GPT-5.2 models match GPT-5 and 5.1 with a 400K context window and 128K max output tokens, but have a newer knowledge cutoff of Aug. 31, 2025 vs. Sept. 30, 2024 (Simon Willison/Simon Willison's Newsletter)
https://simonw.substack.com/p/gpt-52-and-useful-patterns-for-…

GPT 5.2 and useful patterns for building HTML tools
Plus a YouTube video, a podcast appearance and more

It is bananas that there are people being paid half a billion dollars to get hired at companies doing AI and yet none of those companies have slipped Simon Willison a couple hundred million dollars like they should have.

Updated https://adrianroselli.com/2025/10/openai-aria-and-seo-making-the-web-worse.html to link to a post from Stephanie Stimac that I missed, Simon Willison on prompt injection attacks, a sample attack from Brave, and Chris Coyier’s surprisingly long lis…

OpenAI, ARIA, and SEO: Making the Web Worse
OpenAI has announced it’s launched a new browser, Atlas, with ChatGPT built in. For those familiar with ARIA, OpenAI outlines what to expect (I left the code as I found it, other than removing the target): We’ll continue to make Atlas better, and our roadmap includes multi-profile support, improved developer…

Ah, time to modify agency service offerings to replace "accessibility" with "AI-ready" (and increase the price).
https://fedi.simonwillison.net/@simon/115413652248811652

Simon Willison (@simon@simonwillison.net)
Attached: 1 image It's neat to see them encourage developers to add ARIA tags to pages though, an "agent" can be thought of as effectively another form of assistive technology

A Claude user gets Claude 4.5 Opus to generate a 14,000-token document that Claude calls its "Soul overview"; an Anthropic staffer confirms its authenticity (Simon Willison/Simon Willison's Weblog)
https://simonwillison.net/2025/Dec/2/claude-soul-document/…

Anthropic prices Claude Sonnet 4.5 at $3/1M input and $15/1M output tokens, same as Sonnet 4, cheaper than Opus at $15/$75 but higher than GPT-5 at $1.25/$10 (Simon Willison/Simon Willison's Weblog)
https://simonwillison.net/2025/Sep/29/claude-sonnet-4-5/

Claude Sonnet 4.5 is probably the “best coding model in the world” (at least for now)
Anthropic released Claude Sonnet 4.5 today, with a very bold set of claims: Claude Sonnet 4.5 is the best coding model in the world. It’s the strongest model for building …

DeepMind: video models like Veo 3 could become general purpose foundation models for vision, like LLMs for text, using zero-shot "chain-of-frames" reasoning (Simon Willison/Simon Willison's Weblog)
https://simonwillison.net/2025/Sep/27/v…

Video models are zero-shot learners and reasoners
Fascinating new paper from Google DeepMind which makes a very convincing case that their Veo 3 model - and generative video models in general - serve a similar role in …

Anthropic prices Claude Opus 4.5 at $5/1M input and $25/1M output tokens, much cheaper than Opus 4.1 at $15/$75 but still pricier than GPT-5.1 and Gemini 3 Pro (Simon Willison/Simon Willison's Weblog)
https://simonwillison.net/2025/Nov/24/claude-opus/

Claude Opus 4.5, and why evaluating new LLMs is increasingly difficult
Anthropic released Claude Opus 4.5 this morning, which they call “best model in the world for coding, agents, and computer use”. This is their attempt to retake the crown for …

Alibaba releases the Qwen3-VL vision models, the Qwen3Guard "safety moderation" models, and three closed-weight models, including Qwen3-Max with 1T parameters (Simon Willison/Simon Willison's Weblog)
https://simonwillison.net/2025/Sep/23/qwen3-vl/

First impressions of ChatGPT Atlas, as browser agents remain confusing, with insurmountable security and privacy risks including prompt injection attacks (Simon Willison/Simon Willison's Weblog)
https://simonwillison.net/2025/Oct/21/introducing-chatgpt-atlas/

Introducing ChatGPT Atlas
Last year OpenAI hired Chrome engineer Darin Fisher, which sparked speculation they might have their own browser in the pipeline. Today it arrived. ChatGPT Atlas is a Mac-only web browser …

Nano Banana Pro is great at following instructions, generates interim "thought images", and makes full infographics with well-rendered text from a short prompt (Simon Willison/Simon Willison's Weblog)
https://simonwillison.net/2025/Nov/20/nano-banana-pro/

Nano Banana Pro aka gemini-3-pro-image-preview is the best available image generation model
Hot on the heels of Tuesday’s Gemini 3 Pro release, today it’s Nano Banana Pro, also known as Gemini 3 Pro Image. I’ve had a few days of preview access …

Gemini 3 Pro is priced at $2-$4 per 1M input tokens and $12-$18 per 1M output tokens, cheaper than Claude Sonnet 4.5 but more expensive than GPT-5.1 (Simon Willison/Simon Willison's Weblog)
https://simonwillison.net/2025/Nov/18/gemini-3/

Trying out Gemini 3 Pro with audio transcription and a new pelican benchmark
Google released Gemini 3 Pro today. Here’s the announcement from Sundar Pichai, Demis Hassabis, and Koray Kavukcuoglu, their developer blog announcement from Logan Kilpatrick, the Gemini 3 Pro Model Card, …

Anthropic's Skills for Claude, which are conceptually very simple, may become a bigger deal than MCP, whose high token usage is its most significant limitation (Simon Willison/Simon Willison's Weblog)
https://simonwillison.net/2025/Oct/16/claude-skills/

Claude Skills are awesome, maybe a bigger deal than MCP
Anthropic this morning introduced Claude Skills, a new pattern for making new abilities available to their models: Claude can now use Skills to improve how it performs specific tasks. Skills …