At Build 2026 Microsoft baked a language model straight into the OS. Aion 1.0 isn’t an app you install — it’s a small language model family shipping in-box on capable Windows 11 devices, plus a Windows Agent Framework to drive it.
What it actually is
Aion 1.0 Plan is the headliner: a 14B reasoning and tool-calling model with 32K context, built to run entirely on your machine. It reasons over intent, calls tools, manages files, and orchestrates sub-agents — no round-trip to the cloud, no per-token bill. A lighter Aion 1.0 Instruct handles fast general chat and is already in Edge Insider preview, with open weights promised on Hugging Face in July.
The agent hook
The Windows Agent Framework is the real move. It packages the loops, planning, memory, and safety controls developers used to bolt on themselves, and orchestrates local agentic workflows against the on-device runtime. SDKs ship via NuGet — Microsoft.AI.Foundry.Local.WinML for Windows-tuned inference, Microsoft.AI.Foundry.Local for cross-platform.
The pitch is simple: privacy-sensitive, offline agents that never leave the device. Microsoft is turning Windows itself into the agent platform — and it’s giving you the model for free.
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