World Model IndexLast reviewed · October 15, 2026
Helios
Prompt-directed video with reference images and rewind snapshots.
- Provider
- ByteDance (as credited by Reactor)
- Category
- Continuous video
- Published price
- $6.12 /hrReactor reserved session wall-clock time
- Resolution
- 640 × 384 native on Reactor; default 2× delivery is 1280 × 768; optional 4×
- Frame rate
- Hosted output rate not specified; official research implementation reports 19.5 end-to-end fps on one H100
- Access
- Reactor hosted API; research code and weights available separately
Capabilities
- Live and scheduled prompts
- Reference image changes
- Pause
- Up to 50 rewind snapshots
Pricing & billing
Reactor: $6.12/hr of reserved GPU time, including idle time. Converted from the provider’s per-second tariff.
Billing basis: Reactor reserved session wall-clock time
Quality evidence
No verified Elo score for this model.
Video Elo measures clip preference. World consistency and interaction latency require separate tests.
Related comparisons
Notes
Reactor chunks contain 33 output frames. Prompt changes apply at the next chunk.
Delivery resolution includes upscaling. H100 research throughput and Reactor service speed use different configurations.
Sources
Last checked October 15, 2026. Specifications and prices use provider sources; Elo links to the evaluator.
- reactor.inchttps://www.reactor.inc/models/helios
- docs.reactor.inchttps://docs.reactor.inc/model-api-reference/helios/overview
- github.comhttps://github.com/coloth/helios
- api.reactor.inchttps://api.reactor.inc/pricing
Compare models
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