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Simon Willison's Weblog

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IA Programmation
Qwen3.6-27B: Flagship-Level Coding in a 27B Dense Model
IA Programmation

Qwen3.6-27B: Flagship-Level Coding in a 27B Dense Model

Qwen3.6-27B: Flagship-Level Coding in a 27B Dense Model Big claims from Qwen about their latest open weight model: Qwen3.6-27B delivers flagship-level agentic coding performance, surpassing the previous-generation open-source flagship Qwen3.5-397B-A17B (397B total / 17B active MoE) across all major coding benchmarks. On Hugging Face Qwen3.5-397B-A17B is 807GB, this new Qwen3.6-27B is 55.6GB. I tried it out with the 16.8GB Unsloth Qwen3.6-27B-GGUF:Q4_K_M quantized version and llama-server using…

Simon Willison's Weblog
Quoting Bobby Holley
IA Programmation

Quoting Bobby Holley

As part of our continued collaboration with Anthropic, we had the opportunity to apply an early version of Claude Mythos Preview to Firefox. This week’s release of Firefox 150 includes fixes for 271 vulnerabilities identified during this initial evaluation. [...] Our experience is a hopeful one for teams who shake off the vertigo and get to work. You may need to reprioritize everything else to bring relentless and single-minded focus to the task, but there is light at the end of the tunnel. We…

Simon Willison's Weblog
Changes to GitHub Copilot Individual plans
IA Programmation

Changes to GitHub Copilot Individual plans

Changes to GitHub Copilot Individual plans On the same day as Claude Code's temporary will-they-won't-they $100/month kerfuffle (for the moment, they won't), here's the latest on GitHub Copilot pricing. Unlike Anthropic, GitHub put up an official announcement about their changes, which include tightening usage limits, pausing signups for individual plans (!), restricting Claude Opus 4.7 to the more expensive $39/month "Pro+" plan, and dropping the previous Opus models entirely. The key…

Simon Willison's Weblog
Is Claude Code going to cost $100/month? Probably not - it's all very confusing
IA Programmation

Is Claude Code going to cost $100/month? Probably not - it's all very confusing

Anthropic today quietly (as in silently, no announcement anywhere at all) updated their claude.com/pricing page (but not their Choosing a Claude plan page, which shows up first for me on Google) to add this tiny but significant detail (arrow is mine, and it's already reverted): The Internet Archive copy from yesterday shows a checkbox there. Claude Code used to be a feature of the $20/month Pro plan, but according to the new pricing page it is now exclusive to the $100/month or $200/month Max…

Simon Willison's Weblog
Where's the raccoon with the ham radio? (ChatGPT Images 2.0)
IA Programmation

Where's the raccoon with the ham radio? (ChatGPT Images 2.0)

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 was equivalent to jumping from GPT-3 to GPT-5. Here's how I put it to the test. My prompt: Do a where's Waldo style image but it's where is the raccoon holding a ham radio gpt-image-1 First as a baseline here's what I got from the older gpt-image-1 using ChatGPT directly: I wasn't able to spot the raccoon - I quickly realized that testing…

Simon Willison's Weblog
Quoting Andreas Påhlsson-Notini
IA Programmation

Quoting Andreas Påhlsson-Notini

AI agents are already too human. Not in the romantic sense, not because they love or fear or dream, but in the more banal and frustrating one. The current implementations keep showing their human origin again and again: lack of stringency, lack of patience, lack of focus. Faced with an awkward task, they drift towards the familiar. Faced with hard constraints, they start negotiating with reality. — Andreas Påhlsson-Notini, Less human AI agents, please. Tags: ai-agents, coding-agents, ai

Simon Willison's Weblog
llm-openrouter 0.6
IA Programmation

llm-openrouter 0.6

Release: llm-openrouter 0.6 llm openrouter refresh command for refreshing the list of available models without waiting for the cache to expire. I added this feature so I could try Kimi 2.6 on OpenRouter as soon as it became available there. Here's its pelican - this time as an HTML page because Kimi chose to include an HTML and JavaScript UI to control the animation. Transcript here. Tags: openrouter, llm, llm-release, pelican-riding-a-bicycle, kimi, ai-in-china, llms, ai, generative-ai

Simon Willison's Weblog
SQL functions in Google Sheets to fetch data from Datasette
IA Programmation

SQL functions in Google Sheets to fetch data from Datasette

TIL: SQL functions in Google Sheets to fetch data from Datasette I put together some notes on patterns for fetching data from a Datasette instance directly into Google Sheets - using the importdata() function, a "named function" that wraps it or a Google Apps Script if you need to send an API token in an HTTP header (not supported by importdata().) Here's an example sheet demonstrating all three methods. Tags: spreadsheets, datasette, google

Simon Willison's Weblog
Claude Token Counter, now with model comparisons
IA Programmation

Claude Token Counter, now with model comparisons

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 order to compare them. As far as I can tell Claude Opus 4.7 is the first model to change the tokenizer, so it's only worth running comparisons between 4.7 and 4.6. The Claude token counting API accepts any Claude model ID though so I've included options for all four of the notable current models (Opus 4.7 and 4.6, Sonnet 4.6, and Haiku…

Simon Willison's Weblog
Headless everything for personal AI
IA Programmation

Headless everything for personal AI

Headless everything for personal AI Matt Webb thinks headless services are about to become much more common: Why? Because using personal AIs is a better experience for users than using services directly (honestly); and headless services are quicker and more dependable for the personal AIs than having them click round a GUI with a bot-controlled mouse. Evidently Marc Benioff thinks so too: Welcome Salesforce Headless 360: No Browser Required! Our API is the UI. Entire Salesforce & Agentforce…

Simon Willison's Weblog
Changes in the system prompt between Claude Opus 4.6 and 4.7
IA Programmation

Changes in the system prompt between Claude Opus 4.6 and 4.7

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 Claude 3 in July 2024 and it's always interesting to see how the system prompt evolves as they publish new models. Opus 4.7 shipped the other day (April 16, 2026) with a Claude.ai system prompt update since Opus 4.6 (February 5, 2026). I had Claude Code take the Markdown version of their system prompts, break that up into separate…

Simon Willison's Weblog
Claude system prompts as a git timeline
IA Programmation

Claude system prompts as a git timeline

Research: Claude system prompts as a git timeline Anthropic publish the system prompts for Claude chat and make that page available as Markdown. I had Claude Code turn that page into separate files for each model and model family with fake git commit dates to enable browsing the changes via the GitHub commit view. I used this to write my own detailed notes on the changes between Opus 4.6 and 4.7. Tags: system-prompts, anthropic, claude, generative-ai, ai, llms

Simon Willison's Weblog
Adding a new content type to my blog-to-newsletter tool
IA Programmation

Adding a new content type to my blog-to-newsletter tool

Agentic Engineering Patterns > Here's an example of a deceptively short prompt that got a lot of work done in a single shot. First, some background. I send out a free Substack newsletter around once a week containing content copied-and-pasted from my blog. I'm effectively using Substack as a lightweight way to allow people to subscribe to my blog via email. I generate the newsletter with my blog-to-newsletter tool - an HTML and JavaScript app that fetches my latest content from this…

Simon Willison's Weblog
Join us at PyCon US 2026 in Long Beach - we have new AI and security tracks this year
IA Programmation

Join us at PyCon US 2026 in Long Beach - we have new AI and security tracks this year

This year's PyCon US is coming up next month from May 13th to May 19th, with the core conference talks from Friday 15th to Sunday 17th and tutorial and sprint days either side. It's in Long Beach, California this year, the first time PyCon US has come to the West Coast since Portland, Oregon in 2017 and the first time in California since Santa Clara in 2013. If you're based in California this is a great opportunity to catch up with the Python community, meet a whole lot of interesting people…

Simon Willison's Weblog
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