Model comparison
Compare Runway Gen-4.5 and LTX-2.5 Fast 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) |
|---|---|---|
| LTX-2.5 FastLightricks | Lightricks | 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.
LTX's speed-optimized video model for text, image, or audio input, native sound, automatic duration, and output up to 4K.
Fast does not mean every 4K job finishes instantly. Price grows from $0.09 to $0.30 per generated second, and permitted duration depends on resolution and frame rate.
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 | LTX-2.5 Fast |
|---|---|---|
| Generation priceCurrent list price per generated second or the provider's closest billing unit. | 12 credits / sec = $0.12 / sec | $0.09/s 720p to $0.30/s 4K |
| Clip durationDocumented duration choices or maximum clip length. | 2–10 seconds | 6–20 seconds depending on resolution and frame rate |
| Maximum outputHighest provider-documented output resolution, with relevant constraints. | Endpoint and output-format dependent | 4K |
| Native audioWhether the endpoint generates synchronized audio with video. | No native audio listed | Yes; can also generate silent video |
| Input modesSupported text, image, video, reference, or motion inputs. | Text or image to video | Text, image, or audio; optional last frame and camera motion |
| Generation timeOnly shown when a provider publishes a range; not a Cody benchmark. | Not published | Fast tier; exact time not published |
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
The reviewed public LTX model and pricing guides do not state one complete endpoint-specific retention or training-use commitment. Verify current account and enterprise terms for sensitive media.
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. LTX-2.5 Fast: LTX's speed-optimized video model for text, image, or audio input, native sound, automatic duration, and output up to 4K.
Consider Runway Gen-4.5 when your priority is Editorial and post-production workflows. Consider LTX-2.5 Fast when your priority is Fast video experiments with native audio. 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.
