Persistent sessions
Model state stays alive across commands, frames, and recoverable reconnects, so an interactive world can continue without rebuilding context.
The realtime world cloud · Private beta
Build worldsthat answer back.
Windflow turns interactive video and world models into continuous, controllable sessions. Connect once, receive live frames, and send the controls each model supports while it runs.
01Why sessions
A request ends. A world session continues. Connect once, receive live frames, and steer what happens next while the model is still running.
Bidirectional control
Prompts, images, camera motion, and actions travel over the same live control channel, reshaping the active stream without restarting it.
GPU runtime
Long-lived GPU workers keep model state warm while WebRTC returns continuous frames through a low-latency session path.
Stateful metering
Usage begins when the runtime is ready and is recorded against actual session seconds, keeping every live world tied to a clear lifecycle.
02Model systems
Different models,
one session boundary.
4 of the 10 production model runtimes are shown here. Capacity is reported separately from model lifecycle status.
Full model catalog
WF / 01
Standby
Runtime statusProduction
Long-form realtime video
Helios
A continuous autoregressive stream with prompt steering and optional image conditioning.
33-frame chunks · text + image
Inspect runtime
WF / 02
Standby
Runtime statusProduction
Multi-shot direction
LongLive 2.0
Direct a scene over time, introduce soft shot changes, or cut cleanly into a new sequence.
1280 × 704 · multi-shot
Inspect runtime
WF / 03
Standby
Runtime statusProduction
Live video transformation
SANA-Streaming
Transform an uploaded clip or webcam feed while preserving its original motion and timing.
video + webcam · prompt edit
Inspect runtime
WF / 04
Standby
Runtime statusProduction
Navigable world model
LingBot-World 2.0
Enter an image-anchored world and steer its live stream with persistent movement and look controls.
1408 × 768 · image + WASD / look
Inspect runtime
WF / verified signals
Current evidence
Private-beta scope. Measurements are internal and not an SLA.
Model runtimes
10 production
Current
Developer SDKs
JavaScript · Python
Current
Reference applications
Generation · editing · worlds · multi-shot
Current
Faster Helios readiness
Compile cache · about 12 to 2 min
Windflow measured
Active system
Frames, state, and control in one loop
03Current architecture
One session.
Every signal.
One session boundary connects the developer contract, lifecycle control, GPU execution, and live delivery across the whole runtime.
DeveloperInteractive Session Protocol · JavaScript + Python
ControlAccess · lifecycle · session-second usage ledger
ComputeModel adapters · GPU runtime · model-specific state
MediaWebRTC video · reliable data commands
04Session mechanics
The first frame
is the easy part.
Interactive worlds break the scheduler, the cost model, and the request lifecycle of an inference cloud. Four mechanisms replace them.
WF / 01 · DeadlineInstrumented
sendCommand · set_prompt
Generation · 33-frame blocks
in-flight retirednew intent
Delivery
no gapFrames owe deadlines. Controls land at block edges.
Every command lands at the next generation-block edge: a two-level cancel retires the in-flight block, and delivery never gaps.
51 ms budget · 33-frame blocks
Windflow measured · private beta · not an SLA
05One Session API
Commands in.
Live frames out.
Create a session, subscribe to video and state, then send supported controls without restarting it. Model-specific inputs and limits remain explicit.
WF / Session APIISP / 1.0WebRTC + reliable data
Live transportsession.tsTypeScript
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import { Windflow } from "@windflow/sdk";const session = new Windflow.Session({ model: "helios",});session.on("trackReceived", ({ name, track }) => { if (name === "main_video") video.srcObject = new MediaStream([track]);});await session.connect(jwt);await session.sendCommand("start", { prompt: "a city unfolding at dawn",});
Realtime SDK · Private betaConnected transport
Session shapeStateful
01
Create
Allocate a model runtime
02
Connect
Attach realtime transport
03
Control
Send supported commands while live
04
Observe
Read frames, state, and usage
06Get started
Put a world
in motion.
Building an interactive video product or bringing a new world model online? Join the private beta and test it against a real session workflow.