Changelog

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Changed

• set_image_strength takes effect on the next chunk. A new value applies on its own. You no longer have to send set_image again to apply it.
• A rewind sent while generation is paused now applies before the next chunk. The first chunk after resume comes from the restored snapshot. Before this release, the model generated one more chunk of the old branch first.

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New

• Rewind. Helios saves snapshots of the scene and returns to them on demand. save_snapshot captures the world state, rewind restores it, and list_snapshots reports what the buffer holds. The buffer keeps up to 50 snapshots per session and evicts the oldest once full; a reset empties it, and it is released when the session ends. Each snapshot records the one it descends from, so a save after a rewind branches off the restored snapshot while a save without one extends the branch in progress, and current_snapshot_id on the state message says which branch is live. Rewinding restores the scene but not the prompt, so send the prompt you want to continue with after the rewind. Available in @reactor-models/helios as saveSnapshot, rewind, and listSnapshots, with the matching useHeliosSnapshotSaved, useHeliosRewindComplete, useHeliosRewindFailed, and useHeliosSnapshotList hooks.

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New

• Image conditioning for Helios. set_image() accepts a reference image to steer generation, with cut or blend transitions for swapping mid-stream. See Helios.

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Improved

• Image size guidance clarified: 64KB limit with JPEG quality 0.5 recommended for set-image calls.

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New

• Helios launch. Reactor’s first interactive real-time video generation model, built on a 14B-parameter Diffusion Transformer. Produces a continuous infinite stream you can steer with prompts and reference images.
• Helios prompt guide. A dedicated Prompt Guide covering scene composition, transitions, and steering techniques.