LTX 2.5 Fast API Pricing: $0.043/s at 720p

TL;DR

• The LTX 2.5 Fast family (text-to-video ltx-2.5-fast/text-to-video + image-to-video ltx-2.5-fast/image-to-video) bills per second: $0.043/s at 720p (a 6-second clip is $0.258) and $0.086/s at 1080P; both endpoints share pricing, and the audio switch is free.
• Twelve enumerated durations (2–20 s); your bill is duration × the per-second rate. $10 buys about 38 clips (720p, 6 s).
• Both endpoints are live: the text-to-video page and the image-to-video page. New accounts get 200 free credits. Usage: the t2v guide.

Price table (text and image endpoints alike)

Tier	Per second	5 s clip	6 s clip	10 s clip	100 clips (6 s)	$10 yields (6 s)
720p (default)	$0.043	$0.215	$0.258	$0.43	$25.80	38
1080P	$0.086	$0.43	$0.516	$0.86	$51.60	19

HiAPI current prices, checked October 23, 2026. The generate_audio switch never changes the price; failed tasks refund.

Real outputs at both resolutions

Both clips are aerial shots, ~5 s, 16:9, with sound; the prompts differ (an alpine lake versus a futuristic city) — read the pair for resolution and sharpness only:

720p $0.215 (5 s)	1080P $0.43 (5 s)
720p alpine lake →	1080P future city →

Left: ltx-2.5-fast/text-to-video, 720p, 1280×720, ~5 s, audio, $0.215. Right: 1080P, 1920×1080, ~5 s, audio, $0.43. Different prompts — resolution and sharpness are the point.

What you can see:

• Both are drone views with ambient sound; 1080P's building edges and light trails read sharper.
• At 5 seconds, 1080P costs 2× 720p — pick per delivery platform, not by default.

Spending less

• Iterate at 720p: composition and motion read fine; upgrade keepers to 1080P.
• Audio is free: generate_audio: false gives clean footage at the same price — no penalty for scoring in post.
• Match duration to content: one action fits 5–6 s; duration takes enumerated values only (2, 3, 4, 5, 6, 8, 10, 12, 14, 16, 18, 20).
• Bulk at 720p: 100 six-second clips cost $25.80; vertical 9:16 is the same price.

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

Model	720p	1080p	Notes
grok-imagine-1.5-lite/text-to-video	$0.043	$0.2	Sound always on; duration any integer 1–15
ltx-2.5-fast/* (this family)	silent $0.043 / audio same	$0.086	Free audio switch; 12 durations
wan2.6-flash/image-to-video	silent $0.029 / audio $0.0575	silent $0.043 / audio $0.086	5/10/15 s only; aspect follows image
grok-imagine/text-to-video	$0.0214	$0.057142	480p $0.0114
wan2.7-video/image-to-video	$0.1	$0.167	Input uses a media array

Silent 720p is cheaper on Wan 2.6 Flash; for 1080P with controllable audio, LTX's $0.086 is a direct option.

Monthly budgets (720p, 6 s per clip)

Clips / month	All 720p	All 1080P
100	$25.80	$51.60
500	$129.00	$258.00
1,000	$258.00	$516.00

"720p drafts + 1080P finals" is the common mix: 400 six-second 720p drafts plus 100 six-second 1080P finals runs about $154.80 a month.

FAQ

• Yes, text and image endpoints cost the same — no input-image fee.
• Yes, muting saves nothing: only resolution and duration set the price.
• Yes, durations are 12 enumerated values (2–20); 7 or 9 returns a 400.
• Yes, $10 buys about 38 clips (720p, 6 s).
• Yes, failures are free; validation rejections never bill.

Next: take one prompt and run a 720p clip ($0.258 for 6 s); scene templates are in the t2v prompt guide.