Can websites use AI without sending page data to the cloud? Opera has shipped an early local preview
Opera 139 now exposes opt-in prompt, classification and embedding interfaces backed by on-device models. The preview narrows cloud disclosure but does not make every model, extension or permission choice private or reliable.
The short version
- What happened
- Opera 139 has launched WebAI as an opt-in early preview: compatible sites and extensions can call local prompt, classification and semantic-embedding interfaces.
- Who it affects
- A person could use a page-aware AI tool without automatically sending the relevant text to a cloud model provider. They still need understandable controls over which sites can call the model and evidence that extensions cannot misuse the local capability.
- What remains unproven
- Company announcement
Keep in mind
Company announcement
Early preview
No independent benchmark
No published energy or battery measurements
Limited operating-system and processor support
Model and hardware performance varies
Local processing does not validate calling sites or extensions
Source analysis · 2 linked sources. Primary analysed source date: 27 October 2026.
Read the full report · 3 min The evidence, methods, implications and limitations
The browser becomes the model host
Opera 139 now lets a compatible website or extension ask the browser to generate text, classify information or compare text semantically using an on-device model. The user must first enable WebAI in settings and download a compatible model. Opera says permissions are granted per site, and developers do not need their own cloud AI account, server or per-request API bill.
That design can keep the page material handled by the local model on the user's computer instead of sending it to an external model provider. It also shifts compute, storage and electricity use onto the device. Response speed and capability therefore depend on the selected model and hardware, not just the website calling the interface.[1][2]
Local does not automatically mean safe or dependable
Opera calls WebAI a proposed standard and an early preview. Its examples are experimental extensions, not built-in production features. The launch supplies no shared test of hallucination, malicious prompts, permission confusion, model updates, battery use or performance across supported computers. Sites still decide what they ask the model to process, while users must understand and manage access.
The first release supports 64-bit Windows PCs with Intel or AMD processors and Macs with Apple silicon; Linux, Windows on Arm and Intel Macs are excluded. Independent browser-security review, clear permission telemetry and reproducible model-and-device benchmarks would show whether the local approach delivers its privacy and usability promise at scale.[1][2]
The distinction that matters
Where the data travels
The preview changes who supplies the model and where inference runs.
Enable
User opts in and downloads a model
No model download by default
Permit
A site or extension requests WebAI access
Site-specific browser permission
Run
The browser processes supported tasks locally
No required cloud-model round trip