Short answer
If you mean Grok on grok.com or in the Grok app, xAI describes its Free plan as having limited usage and labels Imagine image generation “Limited”—but it does not publish a specific number of free images, videos, or a reset schedule on its pricing page. Don’t treat a claimed quota, such as five images a day or a midnight reset, as an official guarantee. (xAI pricing)
A separate fal.ai generator describes free runs as dependent on its active offer and your eligibility. It displays the available allowance and any refill information in the generator. That is fal.ai’s offer, not an xAI free-plan allowance; check the generator itself before planning a batch. (fal.ai generator)
For API use, xAI lists Grok Imagine Video 1.5 Lite at $0.02 per second at 480p, $0.03 per second at 720p, or $0.14 per second at 1080p, plus $0.01 per input image. At those listed rates, a 10-second, 720p image-to-video request with one input image comes to about $0.31. (xAI model pricing)
“Free Grok Imagine” can mean different things
| Where you generate | What the available information says | What to budget around |
|---|---|---|
| Grok on xAI’s site or app | The Free plan has limited usage, and Imagine image generation is marked limited. xAI’s public plan information gives no numeric Imagine quota or reset interval. | Treat the amount available to your account as variable; don’t assume a fixed daily count. (xAI pricing) |
fal.ai’s separate generator |
Its generator page says free runs depend on the active offer and your eligibility, and that remaining runs and any refill time appear in the tool. | Check that tool’s current allowance before generating. It is not the xAI consumer plan. (fal.ai generator) |
| API use | The xAI rate card lists pay-per-use charges by output-video second and input image. fal.ai also provides a separate API endpoint and example request for the model. |
Estimate by resolution, duration, and number of input images; confirm current rates and applicable limits before forecasting spend. (xAI model pricing; fal.ai API example) |
The official xAI plan page supports saying that free Imagine image use is limited, but it does not establish an exact allowance or reset time. The public plan information also does not make a specific free-video quota clear. Third-party figures should not be treated as confirmed xAI policy when the official page does not give those details. (xAI pricing)
What fal.ai’s free generator makes
fal.ai describes its generator as turning an uploaded image into a 6-second, 720p video with native sound. Its instructions list JPEG, PNG, and WebP uploads. These are specifications for fal.ai’s generator—not proof of what the free Grok app provides. The fal API example is separate and requests a 10-second clip at 720p; that example does not establish the free generator’s duration options. (fal.ai generator)
API budget: a worked example
For Grok Imagine Video 1.5 Lite, xAI’s published rate card lists these USD charges:
| Output resolution | Video charge | Input-image charge |
|---|---|---|
| 480p | $0.02 per second | $0.01 per image |
| 720p | $0.03 per second | $0.01 per image |
| 1080p | $0.14 per second | $0.01 per image |
For one 10-second, 720p clip from one image: 10 × $0.03 + $0.01 = $0.31. For ten such clips, the same rate-card arithmetic is about $3.10. These are estimates from the listed rates, not a guarantee about charges for failed requests, retries, taxes, or other billing conditions; confirm those details before setting a production budget. (xAI model pricing)
These API rates are separate from a consumer subscription or fal.ai’s conditional free runs. xAI’s video API documentation describes an asynchronous flow: submit a request, poll using its returned request_id, then download the clip. (xAI Video API overview)
What the production API supports
For a concrete request example, fal.ai identifies Grok Imagine Video 1.5 Lite image-to-video and provides the endpoint ID xai/grok-imagine-video/v1.5/lite/image-to-video. Its JavaScript sample uses @fal-ai/client and fal.subscribe, with image_url, prompt, resolution, and duration fields; the example sets resolution to 720p and duration to 10. It also shows queue updates and returning result.data and result.requestId. This is fal.ai’s endpoint and sample—not the xAI API endpoint. (fal.ai API example)
The supplied example is not a complete production specification. It does not establish authentication instructions, a full response or error schema, all supported parameter combinations, failure billing, service guarantees, or your applicable rate limit. Check the current documentation for the API provider and account or team you plan to use before selecting an integration route or estimating throughput. (fal.ai API example; xAI rate limits)
Bottom line: xAI’s public plan information says free Imagine image generation is limited but gives no fixed count. fal.ai’s separate free runs depend on its current offer and your eligibility. If you need predictable video volume, estimate spend from the API’s listed per-second rates, then confirm current billing and limits before production.
Sources
Grok Imagine Video Generator: Free Runs When Available
Grok Imagine Video 1.5 Lite API Model and Pricing