WebAI by Opera

WebAI is an early-preview feature in Opera One, Opera GX and Opera Neon that lets websites and browser extensions use AI models running locally on your computer through Prompt, Decision and Semantic Embeddings APIs, with no API key or local server to set up.

Why it matters

For independent web and extension developers who want to add AI features without paying per-request cloud costs or sending users' page data to an AI provider. Opera describes WebAI as a proposed web standard backed by companies including Google and Microsoft.

Highlights

• Adds Prompt, Decision and Semantic Embeddings APIs so pages and extensions can generate text, classify content and find related content locally.
• Inference is built into the browser and works with open-weight models provided through Opera or compatible models already on your device.
• Opt-in: nothing downloads until you turn on Enable Web AI API under Settings, Opera AI.
• Opera published six experimental example extensions, such as an article quiz writer and a paragraph-relevance highlighter.
• Developer docs and the supported API list are at next.opera.com/web-ai.

Taken from the project's own README, docs or launch page. Claims about speed or accuracy are the maker's unless stated otherwise.

Worth knowing: It's an early preview, and Opera says response speed depends on your hardware. Features built on it only work for visitors using a supporting browser.

Quick facts

Links

• Official site: https://blogs.opera.com/news/2026/10/webai-local-ai-for-the-web-now-in-opera
• Docs: https://next.opera.com/web-ai

Related ranking

See how established tools compare in Best AI Coding Tools for Developers. New releases aren't scored until we review them against the rubric.

What we couldn't verify

• why_it_matters (the Google and Microsoft backing is Opera's description of the proposed standard)

Checked 2026-10-28 from the tool's own pages. Prices and star counts change, so confirm on the official site. Listing here is not a ranking or an endorsement.