LTX-2.5 Pro costs 30-33% more than Fast at every resolution

LTX-2.5 Pro costs between 30 and 33 percent more than LTX-2.5 Fast at every output resolution on LTX's API price page. The premium is largest at 720p (+33.3%) and smallest at 4K (+30.0%), so moving up a resolution does not make Pro relatively cheaper by much; it stays near a 31 percent step.

Per minute and per 10 seconds

LTX bills video generation per second with no request fees. At 1080p a minute of Fast is 60 x $0.13 = $7.80 and a minute of Pro is 60 x $0.17 = $10.20, a $2.40 difference. At 4K the minute is $18.00 on Fast and $23.40 on Pro, a $5.40 difference. For one 10-second clip at 1080p the difference is $1.30 against $1.70, or 40 cents.

The same two prices apply to image-to-video, and audio-to-video uses the same per-second rates but bills the input audio rather than output video.

Is the premium worth it?

LTX describes Fast as for quick iteration and previews and Pro as for higher fidelity and more stable motion, best for final renders. The price page gives no quality measurement, so the useful decision rule is cost-based: use Fast for the many drafts, and pay the roughly 31 percent step only for clips you will deliver. Ten Fast drafts and one Pro final at 1080p for 10 seconds each costs 10 x $1.30 + $1.70 = $14.70.

What Sume lists

Sume does not list LTX, so there are no LTX rows to buy through Sume. The closest per-second rows in Sume's catalog are wan-3.0 at $0.125 per second at 720p and $0.25 at 1080p, minimax-h3-max at $0.10 at 768p and $0.20 at 1080p, and gemini-omni-flash-1.1 at $0.125 at 720p and $0.1875 at 1080p. These are different models; the comparison is price only.

Sume has no fast or pro switch inside a model. The equivalent of a draft tier is a lower resolution on the same model, for example wan-3.0 at 480p for $0.0625 per second. Query GET /v1/videos/models for the resolutions and durations each model accepts.

Where the premium bites

The premium is a fixed share of the bill, so it scales with how much you render. At 4K a 10-second clip is $3.00 on Fast and $3.90 on Pro, a 90 cent step. A thirty-clip batch of those costs $90.00 on Fast and $117.00 on Pro, a $27.00 difference. At 720p the same batch of ten-second clips costs $27.00 on Fast and $36.00 on Pro.

Test one prompt on both, look at motion stability, and only then decide. If Fast is good enough for your delivery channel, the savings add up quickly; if Pro removes retakes, its higher rate can still be cheaper per keeper.