Grok Imagine video pricing: API per second and subscription limits

Grok Imagine API price per second

xAI bills video by output second at the resolution you choose. Image and video inputs are billed on top.

How the three models differ:

• Grok Imagine Video 1.5 Lite: $0.02/s at 480p, $0.03/s at 720p, $0.14/s at 1080p. Text and image inputs. The jump to 1080p is steep: 4.7 times the 720p price (derived).
• Grok Imagine Video 1.5: $0.08/s at 480p, $0.14/s at 720p, $0.25/s at 1080p. Takes text, image and audio inputs; audio generation is not confirmed on the price page.
• Grok Imagine Video 1.0: $0.05/s at 480p and $0.07/s at 720p. Accepts text, image and video input, including extension, editing and reference-to-video. The video-extension rate is a promotional price that xAI says is subject to change.

Input image and input video fees

• Input images cost $0.002 per image on 1.0 and $0.01 per image on 1.5 and 1.5 Lite.
• Input video is billed at $0.01 per second on grok-imagine-video (1.0), in addition to the output seconds.

For a single image-to-video clip these fees are small next to the per-second price, but they add up in editing or reference workflows with many inputs. Avoiding input video is one way to cut AI video costs.

Is it available on fal.ai?

Yes. fal.ai lists Grok Imagine Video 1.5 at the same price as xAI. For the three-way comparison with direct APIs see fal vs Replicate vs direct API.

Grok video limits and subscription: what is unknown

The Grok app's video allowance depends on xAI's subscription tiers, and those changed recently. xAI's docs navigation now shows an "X Subscription", and the old SuperGrok tiers may no longer be sold to new users. xAI does not publish a checkable price or per-day Imagine cap for them, so none is shown here. Read the live terms on x.ai and the xAI models page before you subscribe.

The API price list shows no per-day cap, and it does not state a maximum clip length. Check the model page for supported durations, then see AI video length limits for the lengths that are confirmed for other models.

xAI lists an Imagine image-quality retirement dated 2026-11-02 in its docs. The video models are not named in it as far as the price page shows.

Worked example: 8 second clip at 720p

An 8 second clip is used as a round number, not a statement about what xAI allows. Assume you keep one generation in two.

• 1.5 Lite at 720p: 8 s x $0.03 = $0.24 per attempt, $0.48 per kept clip.
• 1.0 at 720p: 8 s x $0.07 = $0.56 per attempt, $1.12 per kept clip.
• 1.5 at 720p: 8 s x $0.14 = $1.12 per attempt, $2.24 per kept clip.

All are derived from per-second prices and ignore input fees. At 480p the Lite attempt costs 8 s x $0.02 = $0.16. Put your own numbers into the cost calculator.

API or subscription?

For a developer or a high-volume job, the API is the only route with a published price. A chat subscription may be cheaper for occasional use, but its limits and price are not verifiable here, so you cannot compare it per clip. If you need a cost you can plan around, use the API and a draft-then-final workflow: draft on Lite at 480p, then render the keepers at the resolution you need. See the cheapest AI video generator list for how Lite compares across all routes.