Flux
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
Socket Named Top Sales Organization by RepVue
Cybersécurité Programmation

Socket Named Top Sales Organization by RepVue

Socket has been named a 2026 Reppy Award recipient by RepVue in two categories: Small Companies and Venture Capital Backed Companies. RepVue is the leading platform for B2B sales reps to rate their own employers, with more than 225,000 users, and Reppys recognize top-rated sales organizations based on employee ratings across categories like Culture & Leadership, Compensation, and Product-Market Fit. Socket earned a RepVue Score of 94.25, placing us in the top 5% of all companies on the…

Socket
PHP Alive And Kicking: Episode 22 Sara Golemon
Programmation Web

PHP Alive And Kicking: Episode 22 Sara Golemon

Sara Golemon returns to the show — her first appearance was way back in Episode 2 — for a deep dive into Git Worktrees, a powerful but underused Git feature that lets you work on multiple branches simultaneously without the overhead of stashing, context-switching, or rebuilding from scratch. The episode covers practical real-world use cases, […] The post PHP Alive And Kicking: Episode 22 Sara Golemon appeared first on PHP Architect.

PHP Architect
NIST Officially Stops Enriching Most CVEs as Vulnerability Volume Skyrockets
Cybersécurité Programmation

NIST Officially Stops Enriching Most CVEs as Vulnerability Volume Skyrockets

NIST is moving to a risk-based enrichment model for the National Vulnerability Database, formally abandoning its longstanding goal of analyzing every submitted CVE. Starting immediately, the NVD will only enrich vulnerabilities that appear in CISA's Known Exploited Vulnerabilities (KEV) catalog, software used by the federal government, or software designated as critical under Executive Order 14028. Everything else gets labeled "Not Scheduled." The announcement came during VulnCon, where NVD…

Socket
datasette 1.0a28
IA Programmation

datasette 1.0a28

Release: datasette 1.0a28 I was upgrading Datasette Cloud to 1.0a27 and discovered a nasty collection of accidental breakages caused by changes in that alpha. This new alpha addresses those directly: Fixed a compatibility bug introduced in 1.0a27 where execute_write_fn() callbacks with a parameter name other than conn were seeing errors. (#2691) The database.close() method now also shuts down the write connection for that database. New datasette.close() method for closing down all databases and…

Simon Willison's Weblog