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AI news for builders
The AI stories that matter if you build, each with sources and why it matters. Plus the best apps, tools and MCP servers made with AI agents.
Sig Weekly, free every Monday
A tested AI workflow with the prompts, plus the AI news that matters if you build.
Free list: 21 AI-built products that publish their revenueFunding · Nov 3, 2026
The 18-person startup's Series A values it at $300M, with Nvidia, Bessemer and Bain Capital Ventures in. Harvey and Rogo already use it to post-train open models, and the platform is now open to everyone.
Agents · Nov 3, 2026
NorthCUA puts three open computer-use models on Hugging Face under Apache 2.0, from 9B to 397B
Models · Nov 3, 2026
Meituan releases LongCat-2.5, a 1.6T-parameter agent model trained on Chinese chips, API only for now
Tools · Nov 3, 2026
Claude Code 2.1.317 lets a failing Agent SDK hook block the action, and asks before your email leaves the machine
Tools · Nov 3, 2026
Claude's Messages API can now hold a conversation server-side, so agents send only the new turn
Tools · Nov 2, 2026
Pi 1.5.0 adds custom self-update commands, extension changelogs and GPT-6.1 Terra
Tools · Nov 2, 2026
Anthropic renames Max 20x to Ultra and drops the five-hour limit for verified accounts
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DetailsLaunches · week of November 2, 2026
Tools, apps and MCP servers people built with AI agents. Most are free to try. Each card says what you get.
No live launches this week yet. The queue is the place to watch.
Nothing is dated for today. This week is still open.
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