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AI · May 20, 2025

Prompt & Writing Assistance APIs

On-device AI for web apps, built into Microsoft Edge

Prompt & Writing Assistance APIs launched on May 20, 2025 with 101 votes, #472 of 7,905 launches that month and more than 90% of that year's launches. The site was still online in September 2026, 1 year on.

What it does

Microsoft Edge introduces new Prompt & Writing Assistance APIs, giving web devs easy access to a built-in local SLM (Phi-4-mini) for AI features. Enhances privacy & reduces costs. Preview in Edge Canary/Dev.

Local AI models are a great way to bring AI capabilities to your web application with increased privacy, network independence, and, most importantly, reduced costs relative to cloud-based services. But hosting local AI models on the web, via existing

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