283 summarised stories about Open Source, each linking back to the original source. Browse all topics →
Simon Willison’s Weblog 1 month ago 36
llm-openrouter released version 0.7 to work better with reasoning LLMs available through OpenRouter by updating compatibility with LLM 0.32. It now uses OpenRouter's implementation of the Responses API. It also adds three server-side tools (Shell, WebFetch, WebSearch) that can be enabled via options like -T WebSearch.
Product Hunt 1 month ago 7
Mastra is launching Mastra Factory, an open source agent-powered software delivery environment for building AI-powered apps and agents. It launches today and includes features like persistent coding agents, repo workspaces, issue intake, planning, implementation, and pull request review. As a result, developers can run an end-to-end workflow in a web app they control instead of stitching these steps together manually.
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17 October 2026
Microsoft used today’s announcement to zoom in on what matters in scaling: not just raw capability, but the plumbing behind it. The company revealed MAI-Base-2, a 2T-parameter base model designed to be converted into full LLMs with additional training. Per Microsoft, only 80B parameters activate per prompt, and the training run ate 50T tokens over 38 days using 16,000 Nvidia GB200 GPUs. The headline claim: MAI-Base-2 is up to 12× more hardware-efficient than its predecessors, a metric that will matter to anyone trying to keep inference costs from swallowing margin.
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