Grok Imagine 1.5 Lite API Pricing: $0.043/s at 720P

TL;DR

• The Grok Imagine 1.5 Lite family (text-to-video grok-imagine-1.5-lite/text-to-video + image-to-video grok-imagine-1.5-lite/image-to-video) bills per second: 480P $0.029, 720P (default) $0.043, 1080P $0.20; the image endpoint adds $0.015 per input image.
• A 720P 6-second clip: $0.258 for text-to-video, $0.273 for image-to-video. Treat 1080P separately — $0.20/s means $1.20 for 6 seconds.
• Both endpoints are live: the t2v page and the i2v page. New accounts get 200 free credits. Prompts: the t2v prompt guide and the i2v prompt guide. Usage: the t2v guide and the i2v guide.

Price table (same per-second rates; i2v adds the image fee)

Tier	Per second	t2v 6 s	i2v 6 s (incl. $0.015 fee)	100 clips (i2v 6 s)
480P	$0.029	$0.174	$0.189	$18.90
720P (default)	$0.043	$0.258	$0.273	$27.30
1080P	$0.20	$1.20	$1.215	$121.50

HiAPI current prices, checked October 23, 2026. Sound ships with every clip and can't be disabled at no extra cost; failures refund. 1080P at $0.20/s is ~4.65× 720P — budget it separately.

Same prompt, three tiers, real clips (text-to-video)

One balloon prompt across three tiers, all 6 s, 16:9:

A glass hot-air balloon drifts slowly over a misty valley of terraced rice fields at sunrise. Golden light spills across the water-filled terraces, mist rolls between the hills, a flock of white egrets glides beneath the balloon. Smooth aerial tracking shot, gentle wind sounds and distant birdsong, cinematic, natural colors. No text, no logos.

480P $0.174	720P $0.258	1080P $1.20
480P balloon →	720P balloon →	1080P balloon →

grok-imagine-1.5-lite/text-to-video, one prompt, 6 s each, 16:9. Left to right: 480P $0.174, 720P $0.258, 1080P $1.20; sound generates with the picture (the model has no disable switch).

What you can see:

• All three hold the same composition and camera move (aerial follow with egrets passing).
• 480P is loosest in detail; 720P steps up clearly; 1080P renders the sharpest terrace reflections and feather detail — at $1.20 a clip.
• Iterate prompts at 480P, deliver at 720P, reserve 1080P for finals.

Spending less

• Draft at 480P: $0.174 per 6-second clip — 33% below 720P and 85% below 1080P.
• Count the $0.015: bulk budgets = per-second × seconds × clips + $0.015 × clips.
• Sound can't be muted: strip the track in post; the price doesn't move.
• Any integer duration 1–15 s: one action fits 5–6 seconds — don't pay for filler seconds.

Compared with related video models (HiAPI prices, 720p per second)

Model	Per second	Notes
grok-imagine/text-to-video	$0.0214	480p $0.0114; 1080P $0.057142
wan2.6-flash/image-to-video	silent $0.029 / audio $0.0575	5/10/15 s only
grok-imagine-1.5-lite/* (this family)	$0.043	Sound built in; any integer 1–15 s
ltx-2.5-fast/*	$0.043	Free audio switch; 1080P $0.086
wan2.7-video/image-to-video	$0.1	1080P $0.167

720P is priced alike across the group — the differences are audio policy, duration granularity, and 1080P pricing; the detailed LTX match-up is here.

Monthly budgets (i2v, 6 s per clip)

Clips / month	480P	720P	1080P
100	$18.90	$27.30	$121.50
500	$94.50	$136.50	$607.50
1,000	$189.00	$273.00	$1,215.00

"480P drafts + 720P finals" is the common mix: 400 six-second 480P image-to-video clips plus 100 six-second 720P image-to-video clips runs about $102.90 a month.

FAQ

• Yes, image-to-video adds $0.015 per clip: image_url is required, so the fee always applies; text-to-video has none.
• Yes, sound can't be disabled: every clip ships with audio at the same price; cut it in post.
• Yes, duration is any integer 1–15, not fixed steps.
• Yes, 1080P is expensive: $0.20/s — $1.20 for 6 seconds; budget bulk separately.
• Yes, $10 buys about 36 clips (i2v, 720P, 6 s).

Next: take the balloon prompt and run one 480P clip ($0.174) to check composition; full usage is in the t2v guide; the text-to-video prompt guide has more scenes.