With Firefox 159 out, scroll-driven animations and scoped custom element registries now work in every major browser. Moonshot and OpenAI released new models, Chrome warns before opening HTTP sites, and PHP fixed two bugs that let attackers run code on servers. Then there's Google's A2UI Express, OpenAI and Claude on Google Cloud, and decision models.
Chrome 156 is out with a CSS function for random values and a selector for view transitions. DeepSeek and Meta released open-weight models, Next.js fixed two bugs that let attackers run code on servers, and Cloudflare is porting the TypeScript compiler to Rust. Then there's DevTools news, what's coming to Chrome, decision models, and WebSockets on Vercel.
A lot happened this week. I became a Google Developer Expert in Web Technologies! Gemini 4 Argon tied GPT-6 Astra and Claude Fable 5.1. Chrome 155 and Firefox 158 are out. Then there's what's coming in Chrome 156 and 157, more decision models, Pi 1.0, news from Antigravity and Claude Code, OpenAI's text watermarks, and Cloudflare's AI toll.
Claude Opus 5.5 led Artificial Analysis' tests. I explain what Jev is, the thing everybody is talking about. OpenAI released GPT-6 Sol and Luna, SpaceXAI introduced Grok 4.7, and Xiaomi's MiMo-V2.6-Pro is now free. Chrome 154 allows embedded frames to resize to fit the page, Lighthouse 13.5 checks support for AI assistants, and Cloudflare added previews for each branch. Google, Anthropic, and OpenAI updated their programming tools, and nine mathematicians will help OpenAI with sharing math research.
Artificial Analysis swapped the tests behind the model table so every score moved, Chrome 153 shipped camera and microphone as real HTML elements, OpenAI launched GPT-6 Astra and published an AI-written Navier-Stokes proof, Claude, ChatGPT, and Grok broke on the same morning, and NVIDIA signed to buy Hugging Face.
Claude Fable 5.1 took the top of the model table, Gemini 3.8 Flash came in as the fastest model on it, Chrome and Firefox both shipped, OpenAI is cutting Cursor off, and Go, Flutter, and Dart join The Brief.
Five models entered the weekly table at once, GitHub lost most of a Monday, and Firefox 154 finished two CSS features the other engines already had.
Anthropic explains the invisible watermark Claude will leave in text it generates, Meta ships the Muse Code terminal agent and opens Muse Glimmer's weights, and the State of CSS 2026 results show what other developers actually ship. Plus a refreshed ARIA in HTML rulebook, 41 Chrome security fixes, and two new rows in the model table.
OpenAI cuts GPT-5.6 Luna by 80 percent and the model table returns with two models down to pennies a task, Chrome 152 beta ships the CSS media state pseudo-classes, GitHub opens stacked pull requests to every repository, and Safari's preview build lands Temporal.
Claude Opus 5 tops the intelligence table for the first time, Kimi K3's open weights land, GitHub hardens npm and GitHub Actions, Firefox 153, Chrome 151, and Safari 26.6 ship real platform features, and OpenAI confirms its own models broke into Hugging Face during a cyber test.
