Model comparison
Compare Runway Gen-4.5 and Grok Imagine Video 1.5 using the same provider-sourced video generation rubric. No mystery score and no invented benchmark ranking.
Facts checked September 4, 2026
Set your usage. Your estimate updates as you type.
Example: 8-second, 720p clips with audio. Models that do not support these settings will not receive an estimate.
Estimates exclude taxes, tools, cache storage/writes, free allowances and custom discounts. Image estimates cover output only, not prompt or reference-image charges. Quality modes differ by model. Unlisted settings are not treated as free.
| Model | Access | Estimated total (USD) |
|---|---|---|
| Grok Imagine Video 1.5SpaceXAI | SpaceXAI | No reviewed rate |
| Runway Gen-4.5Runway | Runway | No reviewed rate |
Quick take
Runway's flagship developer video model for text- and image-guided clips, with professional formats and a predictable credit-per-second base rate.
Format surcharges can exceed the base generation cost, and the provider does not publish one render-time number across settings.
SpaceXAI's current video model for turning text, images, or references into short clips with optional generated speech and sound.
Reference-to-video output is capped at 720p, generated download URLs are temporary, and complex requests can take several minutes to complete.
Compare the published facts
Values use each provider's own published units and limits. A blank means the provider did not publish a directly comparable value in the sources reviewed.
| Video generation | Runway Gen-4.5 | Grok Imagine Video 1.5 |
|---|---|---|
| Generation priceCurrent list price per generated second or the provider's closest billing unit. | 12 credits / sec = $0.12 / sec | $0.08 480p · $0.14 720p · $0.25 1080p / sec |
| Clip durationDocumented duration choices or maximum clip length. | 2–10 seconds | 1–15 seconds |
| Maximum outputHighest provider-documented output resolution, with relevant constraints. | Endpoint and output-format dependent | 1080p; references capped at 720p |
| Native audioWhether the endpoint generates synchronized audio with video. | No native audio listed | Yes; can be disabled |
| Input modesSupported text, image, video, reference, or motion inputs. | Text or image to video | Text, image, or references to video |
| Generation timeOnly shown when a provider publishes a range; not a Cody benchmark. | Not published | Typically up to several minutes |
How to choose
Start with the job you need to complete, then validate cost, access, and policy details on your exact provider route.
Data handling depends on the Runway plan and agreement. Review Runway's current terms, workspace controls, and any enterprise commitments before processing confidential media.
Provider and API links
SpaceXAI says API inputs and outputs are not used for training without explicit permission. Default encrypted retention is 30 days; team-level zero data retention is available with feature tradeoffs.
Provider and API links
Frequently asked questions
Runway Gen-4.5: Runway's flagship developer video model for text- and image-guided clips, with professional formats and a predictable credit-per-second base rate. Grok Imagine Video 1.5: SpaceXAI's current video model for turning text, images, or references into short clips with optional generated speech and sound.
Consider Runway Gen-4.5 when your priority is Editorial and post-production workflows. Consider Grok Imagine Video 1.5 when your priority is Short sound-on marketing clips. Test both with your own data and provider route before committing.
No. This comparison aligns provider-published facts for the Video generation category. It does not claim a universal winner or combine incompatible third-party benchmark scores.
