ClipCost · xAI API (Grok Imagine) pricing · LTX API pricing (tool) · Runway pricing · Grok Imagine cost · Grok Imagine vs Veo cost · Grok Imagine vs Kling cost · Grok Imagine vs Wan cost · Grok Imagine vs Seedance cost · Grok Imagine vs Hailuo cost · LTX API pricing · LTX vs Wan cost · LTX vs Veo cost · Seedance vs LTX cost · AI video API pricing · Published Oct 30, 2026 · Prices checked Oct 30, 2026 · Ranked rates from verified data (JSON)
Grok Imagine vs LTX cost: xAI Grok Imagine 1.5 and 1.5 Lite vs Lightricks LTX-2.3 and LTX-2.5 (Fast and Pro), per second and per clip
xAI’s Grok Imagine Video 1.5 / 1.5 Lite and Lightricks’ LTX-2.3 / LTX-2.5 are two of the cheapest AI video APIs, both billed in dollars per second with audio included. Here is every verified rate — the xAI API, the LTX API, the Runway API and the Runway app — priced per 10s, 20s, 30s and 60s clip with the retries you will actually need.
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Quick answer
LTX is cheaper than Grok Imagine in 10 of 13 match-ups — at 1080p, at the quality tier and inside the Runway app — but Grok Imagine has the cheapest rate of all. Grok Imagine 1.5 Lite on xAI’s API is $0.02 per second at 480p ($1.80 per usable 30-second clip, #1 of all 210 rates we rank); LTX starts at 720p. At 720p they tie: Grok Imagine 1.5 Lite and LTX-2.3 Fast are both $0.03 per second with audio ($2.70 usable 30s, #5=). Above that LTX pulls ahead: LTX-2.3 Fast renders native 1080p for $0.06 per second ($5.40) vs $0.14 for Grok Lite’s upscaled 1080p ($12.60) and $0.25 for Grok Imagine 1.5 ($22.50, 3.1× LTX-2.3 Pro at $7.20); at 720p LTX-2.3 Pro ($0.04, $3.60) is 3.5× cheaper than Grok Imagine 1.5 ($0.14, $12.60). Grok Imagine’s other win: Grok Lite 720p ($2.70) vs LTX-2.5 Fast 720p ($8.10). Only LTX offers 1440p and 4K; only Grok Imagine is on the Runway API.
Checked Oct 30, 2026: Grok Imagine Video 1.5 / 1.5 Lite rates unchanged on xAI API pricing; LTX-2.3 / LTX-2.5 Fast and Pro rates unchanged on LTX API pricing (same figures on ltx.io API pricing); Runway API grok_imagine_* rates unchanged on Runway API pricing (no LTX model there); Grok Imagine 1.5 and LTX 2.5 app credits unchanged on the Runway Academy credits page; Runway Standard / Pro / Max plan prices unchanged on runway.com/pricing. No data changes.
Basis: usable = 3 attempts (1 + 2 retries) at the list price per second, as in our calculator. Rank = position among the 210 verified usable-30s rates in our verified data (ties share a rank); API # = position among the 138 rates on AI video API pricing. Runway app rows use Standard annual credits ($12/mo for 625 = $0.0192 per credit). Text-to-video / image-to-video prices; cost only — no quality ranking.
Grok Imagine vs LTX head-to-head (usable 30-second clip)
| Use case | Grok Imagine: route · rate · usable 30s (rank) | LTX: route · rate · usable 30s (rank) | Cheaper | Notes |
|---|---|---|---|---|
| Cheapest rate, any resolution | Grok Imagine 1.5 Lite · 480p · xAI API · $0.02/sec · $1.80 (#1) | LTX-2.3 Fast · 720p · LTX API · $0.03/sec · $2.70 (#5=) | Grok Imagine, $0.90 less | Grok Imagine 1.5 Lite 480p vs LTX-2.3 Fast 720p (LTX starts at 720p) |
| Cheapest 720p | Grok Imagine 1.5 Lite · 720p · xAI API · $0.03/sec · $2.70 (#5=) | LTX-2.3 Fast · 720p · LTX API · $0.03/sec · $2.70 (#5=) | Tie | Grok Imagine 1.5 Lite vs LTX-2.3 Fast, both $0.03 per second with audio |
| 720p quality tier | Grok Imagine 1.5 · 720p · xAI API · $0.14/sec · $12.60 (#112=) | LTX-2.3 Pro · 720p · LTX API · $0.04/sec · $3.60 (#16=) | LTX, $9.00 less | Grok Imagine 1.5 vs LTX-2.3 Pro |
| Cheapest 1080p | Grok Imagine 1.5 Lite · 1080p (720p upscaled) · xAI API · $0.14/sec · $12.60 (#112=) | LTX-2.3 Fast · 1080p · LTX API · $0.06/sec · $5.40 (#34=) | LTX, $7.20 less | Grok Lite 1080p is 720p upscaled; LTX-2.3 Fast renders 1080p |
| Flagship, native 1080p | Grok Imagine 1.5 · 1080p · xAI API · $0.25/sec · $22.50 (#163=) | LTX-2.3 Pro · 1080p · LTX API · $0.08/sec · $7.20 (#56=) | LTX, $15.30 less | Grok Imagine 1.5 vs LTX-2.3 Pro |
| Newest fast tier, 720p | Grok Imagine 1.5 Lite · 720p · xAI API · $0.03/sec · $2.70 (#5=) | LTX-2.5 Fast · 720p · LTX API · $0.09/sec · $8.10 (#67=) | Grok Imagine, $5.40 less | Grok Imagine 1.5 Lite vs LTX-2.5 Fast |
| Newest fast tier, 1080p | Grok Imagine 1.5 Lite · 1080p (720p upscaled) · xAI API · $0.14/sec · $12.60 (#112=) | LTX-2.5 Fast · 1080p · LTX API · $0.13/sec · $11.70 (#108=) | LTX, $0.90 less | Grok Imagine 1.5 Lite (720p upscaled) vs LTX-2.5 Fast |
| Newest models, 720p | Grok Imagine 1.5 · 720p · xAI API · $0.14/sec · $12.60 (#112=) | LTX-2.5 Pro · 720p · LTX API · $0.12/sec · $10.80 (#95=) | LTX, $1.80 less | Grok Imagine 1.5 vs LTX-2.5 Pro |
| Newest models, 1080p | Grok Imagine 1.5 · 1080p · xAI API · $0.25/sec · $22.50 (#163=) | LTX-2.5 Pro · 1080p · LTX API · $0.17/sec · $15.30 (#131=) | LTX, $7.20 less | Grok Imagine 1.5 vs LTX-2.5 Pro |
| Inside the Runway app, cheapest each | Grok Imagine 1.5 · 480p · Runway app (Standard) · 10 cr/sec × $0.0192 · $17.28 (not ranked; would be #139=) | LTX 2.5 Fast · 720p · Runway app (Standard) · 9 cr/sec × $0.0192 · $15.55 (#133=) | LTX, $1.73 less | Grok Imagine 1.5 480p 10 cr/s vs LTX 2.5 Fast 720p 9 cr/s (Standard annual credits) |
| Inside the Runway app, 720p | Grok Imagine 1.5 · 720p · Runway app (Standard) · 16 cr/sec × $0.0192 · $27.65 (not ranked; would be #177=) | LTX 2.5 Fast · 720p · Runway app (Standard) · 9 cr/sec × $0.0192 · $15.55 (#133=) | LTX, $12.10 less | Grok Imagine 1.5 720p 16 cr/s vs LTX 2.5 Fast 720p 9 cr/s |
| Inside the Runway app, 1080p | Grok Imagine 1.5 · 1080p · Runway app (Standard) · 29 cr/sec × $0.0192 · $50.11 (not ranked; would be #201=) | LTX 2.5 Fast · 1080p · Runway app (Standard) · 13 cr/sec × $0.0192 · $22.46 (#160=) | LTX, $27.65 less | Grok Imagine 1.5 1080p 29 cr/s vs LTX 2.5 Fast 1080p 13 cr/s |
| Inside the Runway app, top tier 1080p | Grok Imagine 1.5 · 1080p · Runway app (Standard) · 29 cr/sec × $0.0192 · $50.11 (not ranked; would be #201=) | LTX 2.5 Pro · 1080p · Runway app (Standard) · 17 cr/sec × $0.0192 · $29.38 (#181=) | LTX, $20.73 less | Grok Imagine 1.5 1080p 29 cr/s vs LTX 2.5 Pro 1080p 17 cr/s |
| 480p | Grok Imagine 1.5 Lite · 480p · xAI API · $0.02/sec · $1.80 (#1) | Not offered (LTX starts at 720p) | Grok Imagine only | Not counted |
| Runway API | grok_imagine_1_5_lite 480p · 2 cr/sec · $1.80 | Not offered (LTX is in the Runway app only) | Grok Imagine only | Not counted |
| 1440p and 4K | Not offered (Grok Imagine tops out at 1080p) | LTX-2.3 Fast · 1440p · LTX API · $0.12/sec · $10.80 (#95=); LTX-2.3 Fast · 4K · LTX API · $0.24/sec · $21.60 (#155=) | LTX only | Not counted |
LTX wins 10 of 13 counted match-ups, Grok Imagine 2 (cheapest rate at 480p; Grok Lite 720p vs LTX-2.5 Fast 720p), 1 tie (cheapest 720p, $0.03 per second each). 480p and the Runway API (Grok Imagine only) and 1440p / 4K (LTX only) are not counted. Every rate on both sides includes generated audio.
Every Grok Imagine and LTX route, cheapest first
| Rank (of 210) | API # (of 146) | Family | Route | Model | Rate | 30s try | Usable 30s | Audio |
|---|---|---|---|---|---|---|---|---|
| Not ranked (would be #1=) | #1= | Grok Imagine | Runway API | grok_imagine_1_5_lite · 480p | 2 cr/sec × $0.01 | $0.60 | $1.80 | Yes (on by default, same price) |
| 1 | #1= | Grok Imagine | xAI API | Grok Imagine 1.5 Lite · 480p | $0.02/sec | $0.60 | $1.80 | Yes (on by default, same price) |
| Not ranked (would be #5=) | #5= | Grok Imagine | Runway API | grok_imagine_1_5_lite · 720p | 3 cr/sec × $0.01 | $0.90 | $2.70 | Yes (on by default, same price) |
| 5= | #5= | Grok Imagine | xAI API | Grok Imagine 1.5 Lite · 720p | $0.03/sec | $0.90 | $2.70 | Yes (on by default, same price) |
| 5= | #5= | LTX | LTX API | LTX-2.3 Fast · 720p | $0.03/sec | $0.90 | $2.70 | Yes (on by default, same price) |
| 16= | #13= | LTX | LTX API | LTX-2.3 Pro · 720p | $0.04/sec | $1.20 | $3.60 | Yes (on by default, same price) |
| 34= | #28= | LTX | LTX API | LTX-2.3 Fast · 1080p | $0.06/sec | $1.80 | $5.40 | Yes (on by default, same price) |
| 56= | #45= | Grok Imagine | xAI API | Grok Imagine 1.5 · 480p | $0.08/sec | $2.40 | $7.20 | Yes (on by default, same price) |
| 56= | #45= | LTX | LTX API | LTX-2.3 Pro · 1080p | $0.08/sec | $2.40 | $7.20 | Yes (on by default, same price) |
| 67= | #53 | LTX | LTX API | LTX-2.5 Fast · 720p | $0.09/sec | $2.70 | $8.10 | Yes (on by default, same price) |
| Not ranked (would be #75=) | #55= | Grok Imagine | Runway API | grok_imagine_1_5 · 480p | 10 cr/sec × $0.01 | $3.00 | $9.00 | Yes (on by default, same price) |
| 95= | #70= | LTX | LTX API | LTX-2.3 Fast · 1440p | $0.12/sec | $3.60 | $10.80 | Yes (on by default, same price) |
| 95= | #70= | LTX | LTX API | LTX-2.5 Pro · 720p | $0.12/sec | $3.60 | $10.80 | Yes (on by default, same price) |
| 108= | #79= | LTX | LTX API | LTX-2.5 Fast · 1080p | $0.13/sec | $3.90 | $11.70 | Yes (on by default, same price) |
| Not ranked (would be #112=) | #82= | Grok Imagine | Runway API | grok_imagine_1_5_lite · 1080p | 14 cr/sec × $0.01 | $4.20 | $12.60 | Yes (on by default, same price) |
| 112= | #82= | Grok Imagine | xAI API | Grok Imagine 1.5 · 720p | $0.14/sec | $4.20 | $12.60 | Yes (on by default, same price) |
| 112= | #82= | Grok Imagine | xAI API | Grok Imagine 1.5 Lite · 1080p (720p upscaled) | $0.14/sec | $4.20 | $12.60 | Yes (on by default, same price) |
| Not ranked (would be #129=) | #100= | Grok Imagine | Runway API | grok_imagine_1_5 · 720p | 16 cr/sec × $0.01 | $4.80 | $14.40 | Yes (on by default, same price) |
| 129 | #100= | LTX | LTX API | LTX-2.3 Pro · 1440p | $0.16/sec | $4.80 | $14.40 | Yes (on by default, same price) |
| 131= | #103= | LTX | LTX API | LTX-2.5 Pro · 1080p | $0.17/sec | $5.10 | $15.30 | Yes (on by default, same price) |
| 133= | — | LTX | Runway app (Standard) | LTX 2.5 Fast · 720p | 9 cr/sec × $0.0192 | $5.18 | $15.55 | Yes (on by default, same price) |
| 137= | #106= | LTX | LTX API | LTX-2.5 Fast · 1440p | $0.19/sec | $5.70 | $17.10 | Yes (on by default, same price) |
| Not ranked (would be #139=) | — | Grok Imagine | Runway app (Standard) | Grok Imagine 1.5 · 480p | 10 cr/sec × $0.0192 | $5.76 | $17.28 | Yes (on by default, same price) |
| 149= | — | LTX | Runway app (Standard) | LTX 2.5 Pro · 720p | 12 cr/sec × $0.0192 | $6.91 | $20.74 | Yes (on by default, same price) |
| 155= | #114= | LTX | LTX API | LTX-2.3 Fast · 4K | $0.24/sec | $7.20 | $21.60 | Yes (on by default, same price) |
| 160= | — | LTX | Runway app (Standard) | LTX 2.5 Fast · 1080p | 13 cr/sec × $0.0192 | $7.49 | $22.46 | Yes (on by default, same price) |
| 163= | #119= | Grok Imagine | xAI API | Grok Imagine 1.5 · 1080p | $0.25/sec | $7.50 | $22.50 | Yes (on by default, same price) |
| 163= | #119= | LTX | LTX API | LTX-2.5 Pro · 1440p | $0.25/sec | $7.50 | $22.50 | Yes (on by default, same price) |
| Not ranked (would be #173) | #125 | Grok Imagine | Runway API | grok_imagine_1_5 · 1080p | 29 cr/sec × $0.01 | $8.70 | $26.10 | Yes (on by default, same price) |
| 173= | #126= | LTX | LTX API | LTX-2.5 Fast · 4K | $0.30/sec | $9.00 | $27.00 | Yes (on by default, same price) |
| Not ranked (would be #177=) | — | Grok Imagine | Runway app (Standard) | Grok Imagine 1.5 · 720p | 16 cr/sec × $0.0192 | $9.22 | $27.65 | Yes (on by default, same price) |
| 180 | #131 | LTX | LTX API | LTX-2.3 Pro · 4K | $0.32/sec | $9.60 | $28.80 | Yes (on by default, same price) |
| 181= | — | LTX | Runway app (Standard) | LTX 2.5 Pro · 1080p | 17 cr/sec × $0.0192 | $9.79 | $29.38 | Yes (on by default, same price) |
| 185 | — | LTX | Runway app (Standard) | LTX 2.5 Fast · 1440p | 19 cr/sec × $0.0192 | $10.94 | $32.83 | Yes (on by default, same price) |
| 191= | #133= | LTX | LTX API | LTX-2.5 Pro · 4K | $0.39/sec | $11.70 | $35.10 | Yes (on by default, same price) |
| Not ranked (would be #201=) | — | Grok Imagine | Runway app (Standard) | Grok Imagine 1.5 · 1080p | 29 cr/sec × $0.0192 | $16.70 | $50.11 | Yes (on by default, same price) |
| 203= | — | LTX | Runway app (Standard) | LTX 2.5 Fast · 4K | 30 cr/sec × $0.0192 | $17.28 | $51.84 | Yes (on by default, same price) |
Runway app rows on Max annual credits ($0.008 per credit): Grok Imagine 1.5 480p $7.20, 720p $11.52, 1080p $20.88; LTX 2.5 Fast 720p $6.48, 1080p $9.36; LTX 2.5 Pro 1080p $12.24. Grok Imagine 1.5 app rows (image-to-video, per the Runway Academy credits page) are official prices not in our usable-30s ranking (“would be #”); Runway API rows are ranked only among API rates. Runway charges +1 credit per image or audio reference for Grok. The Runway app lists LTX 2.5 Pro at 720p and 1080p only. Flag: the Runway Academy page lists Grok Imagine 1.5 Lite in the app at 10 / 15 / 70 credits per second while the Runway API lists 2 / 3 / 14; we could not confirm which applies in the app, so those rows are left out.
Cost per 10s, 20s, 30s and 60s clip: try and usable
| Model | Route | 10s try | 10s usable | 20s try | 20s usable | 30s try | 30s usable | 60s try | 60s usable |
|---|---|---|---|---|---|---|---|---|---|
| Grok Imagine: Grok Imagine 1.5 Lite · 480p | xAI API | $0.20 | $0.60 | $0.40 | $1.20 | $0.60 | $1.80 | $1.20 | $3.60 |
| Grok Imagine: Grok Imagine 1.5 Lite · 720p | xAI API | $0.30 | $0.90 | $0.60 | $1.80 | $0.90 | $2.70 | $1.80 | $5.40 |
| LTX: LTX-2.3 Fast · 720p | LTX API | $0.30 | $0.90 | $0.60 | $1.80 | $0.90 | $2.70 | $1.80 | $5.40 |
| LTX: LTX-2.3 Pro · 720p | LTX API | $0.40 | $1.20 | $0.80 | $2.40 | $1.20 | $3.60 | $2.40 | $7.20 |
| LTX: LTX-2.3 Fast · 1080p | LTX API | $0.60 | $1.80 | $1.20 | $3.60 | $1.80 | $5.40 | $3.60 | $10.80 |
| Grok Imagine: Grok Imagine 1.5 · 480p | xAI API | $0.80 | $2.40 | $1.60 | $4.80 | $2.40 | $7.20 | $4.80 | $14.40 |
| LTX: LTX-2.3 Pro · 1080p | LTX API | $0.80 | $2.40 | $1.60 | $4.80 | $2.40 | $7.20 | $4.80 | $14.40 |
| LTX: LTX-2.5 Fast · 720p | LTX API | $0.90 | $2.70 | $1.80 | $5.40 | $2.70 | $8.10 | $5.40 | $16.20 |
| LTX: LTX-2.3 Fast · 1440p | LTX API | $1.20 | $3.60 | $2.40 | $7.20 | $3.60 | $10.80 | $7.20 | $21.60 |
| LTX: LTX-2.5 Pro · 720p | LTX API | $1.20 | $3.60 | $2.40 | $7.20 | $3.60 | $10.80 | $7.20 | $21.60 |
| LTX: LTX-2.5 Fast · 1080p | LTX API | $1.30 | $3.90 | $2.60 | $7.80 | $3.90 | $11.70 | $7.80 | $23.40 |
| Grok Imagine: Grok Imagine 1.5 Lite · 1080p (720p upscaled) | xAI API | $1.40 | $4.20 | $2.80 | $8.40 | $4.20 | $12.60 | $8.40 | $25.20 |
| Grok Imagine: Grok Imagine 1.5 · 720p | xAI API | $1.40 | $4.20 | $2.80 | $8.40 | $4.20 | $12.60 | $8.40 | $25.20 |
| LTX: LTX-2.3 Pro · 1440p | LTX API | $1.60 | $4.80 | $3.20 | $9.60 | $4.80 | $14.40 | $9.60 | $28.80 |
| LTX: LTX-2.5 Pro · 1080p | LTX API | $1.70 | $5.10 | $3.40 | $10.20 | $5.10 | $15.30 | $10.20 | $30.60 |
| LTX: LTX-2.5 Fast · 1440p | LTX API | $1.90 | $5.70 | $3.80 | $11.40 | $5.70 | $17.10 | $11.40 | $34.20 |
| LTX: LTX-2.3 Fast · 4K | LTX API | $2.40 | $7.20 | $4.80 | $14.40 | $7.20 | $21.60 | $14.40 | $43.20 |
| Grok Imagine: Grok Imagine 1.5 · 1080p | xAI API | $2.50 | $7.50 | $5.00 | $15.00 | $7.50 | $22.50 | $15.00 | $45.00 |
| LTX: LTX-2.5 Pro · 1440p | LTX API | $2.50 | $7.50 | $5.00 | $15.00 | $7.50 | $22.50 | $15.00 | $45.00 |
| LTX: LTX-2.5 Fast · 4K | LTX API | $3.00 | $9.00 | $6.00 | $18.00 | $9.00 | $27.00 | $18.00 | $54.00 |
| LTX: LTX-2.3 Pro · 4K | LTX API | $3.20 | $9.60 | $6.40 | $19.20 | $9.60 | $28.80 | $19.20 | $57.60 |
| LTX: LTX-2.5 Pro · 4K | LTX API | $3.90 | $11.70 | $7.80 | $23.40 | $11.70 | $35.10 | $23.40 | $70.20 |
Per-second billing for every row. Grok Imagine makes 1–15 seconds per generation (default 8, xAI video generation guide). LTX Fast makes 6–20 seconds (even numbers) at 720p and 1080p at 24/25 fps; LTX Pro, 1440p, 4K and 48/50 fps make 6, 8 or 10 seconds (LTX-2.3 model page, LTX-2.5 model page). Longer clips are stitched from several generations at the same per-second price.
Which to pick (on cost)
- Cheapest drafts at 480p: Grok Imagine 1.5 Lite on xAI, $1.80 per usable 30s — LTX has no 480p. See xAI API (Grok Imagine) pricing and Grok Imagine cost.
- Cheapest 720p with sound: a tie — Grok Imagine 1.5 Lite or LTX-2.3 Fast, $2.70 per usable 30s either way. LTX-2.3 Pro ($3.60) is the cheapest step up.
- 1080p: LTX-2.3 Fast ($5.40) or Pro ($7.20) over Grok Imagine 1.5 ($22.50); Grok Lite’s 1080p ($12.60) is 720p upscaled. See LTX API pricing.
- Newest models: LTX-2.5 Pro over Grok Imagine 1.5 at 720p ($10.80 vs $12.60) and 1080p ($15.30 vs $22.50).
- 1440p or 4K: LTX only — LTX-2.3 Fast 1440p $10.80, 4K $21.60.
- Building on an API: both are among the cheapest — see Cheapest AI video API and AI video API pricing.
- Already paying for Runway: in the app, LTX 2.5 Fast 720p ($15.55) over Grok Imagine 1.5 ($17.28 at 480p, $27.65 at 720p); on the Runway API only Grok is offered (
grok_imagine_1_5_lite, same price as xAI). Both are cheaper bought direct. See Runway pricing and Runway models ranked by cost.
Related: calculator · Runway vs Kling vs Pika vs Veo · AI video pricing comparison · AI video API pricing · Cheapest AI video API · Cheapest AI video generator · Grok Imagine cost · Grok Imagine vs Veo cost · Grok Imagine vs Kling cost · Grok Imagine vs Wan cost · Grok Imagine vs Seedance cost · LTX API pricing · LTX vs Wan cost · LTX vs Veo cost · Seedance vs LTX cost · Runway API pricing · AI video for TikTok/Shorts cost · FAQ.
Sources (checked Oct 30, 2026)
- xAI API pricing —
grok-imagine-video-1.5$0.08 / $0.14 / $0.25 andgrok-imagine-video-1.5-lite$0.02 / $0.03 / $0.14 per second at 480p / 720p / 1080p, +$0.01 per input image. Grok Imagine 1.5 Lite model page — 1080p is rendered at 720p and upscaled (checked Oct 27, 2026). xAI video generation guide — 1 to 15 seconds per generation;generate_audio=falsefor a silent clip. - LTX API pricing — text-to-video and image-to-video per second of output:
ltx-2-3-fast$0.03 / $0.06 / $0.12 / $0.24,ltx-2-3-pro$0.04 / $0.08 / $0.16 / $0.32,ltx-2-5-fast$0.09 / $0.13 / $0.19 / $0.30,ltx-2-5-pro$0.12 / $0.17 / $0.25 / $0.39 at 720p / 1080p / 1440p / 4K; audio-to-video billed on input audio (LTX-2.3 Pro $0.06 / $0.10 / $0.18 / $0.34). ltx.io API pricing — same figures. LTX-2.3 model page and LTX-2.5 model page — durations per resolution and fps; audio on by default (generate_audio: falsefor silent). - Runway API pricing —
grok_imagine_1_5_lite2 / 3 / 14,grok_imagine_1_510 / 16 / 29 credits per second (480p / 720p / 1080p), $0.01 per credit; no LTX model. Runway Academy credits page — Grok Imagine 1.5 10 / 16 / 29 (image-to-video); Grok Imagine 1.5 Lite 10 / 15 / 70 (conflicts with the API, see flag); LTX 2.5 Fast 9 / 13 / 19 / 30 and LTX 2.5 Pro 12 / 17 credits per second. runway.com/pricing — Standard $12/mo annual for 625 credits, Pro $28 for 2,250, Max $76 for 9,500.
FAQ
Is Grok Imagine or LTX cheaper?
LTX, in most match-ups we price (checked Oct 30, 2026), but Grok Imagine has the single cheapest rate. Grok Imagine 1.5 Lite on xAI's API is $0.02 per second at 480p ($1.80 per usable 30-second clip with 2 retries), and LTX starts at 720p. At 720p the two tie: Grok Imagine 1.5 Lite and LTX-2.3 Fast are both $0.03 per second with audio ($2.70 usable 30s). From there LTX is cheaper: LTX-2.3 Pro 720p is $0.04 ($3.60) vs $0.14 for Grok Imagine 1.5 ($12.60), and at 1080p LTX-2.3 Fast is $0.06 ($5.40) vs $0.14 for Grok Lite's upscaled 1080p and $0.25 for native Grok Imagine 1.5 ($22.50). LTX wins 10 of 13 match-ups, Grok Imagine 2, with 1 tie.
How much does a 30-second video cost on Grok Imagine vs LTX?
With 2 retries (3 attempts), a usable 30-second clip costs $1.80 on Grok Imagine 1.5 Lite 480p, $2.70 at 720p, $12.60 on Grok Imagine 1.5 720p and $22.50 at native 1080p (xAI API, audio included). On the LTX API it is $2.70 on LTX-2.3 Fast 720p, $3.60 on LTX-2.3 Pro 720p, $5.40 on LTX-2.3 Fast 1080p, $7.20 on LTX-2.3 Pro 1080p and $15.30 on LTX-2.5 Pro 1080p. One 30-second try is a third of that. Grok Imagine makes 1 to 15 seconds per generation; LTX Fast makes 6 to 20 seconds (even numbers) at 720p and 1080p at 24/25 fps and 6, 8 or 10 seconds otherwise, so a 30-second clip is two or more generations on either.
Which is cheaper at 1080p and 4K, Grok Imagine or LTX?
LTX. At 1080p LTX-2.3 Fast is $0.06 per second ($5.40 usable 30s) and LTX-2.3 Pro $0.08 ($7.20), against $0.25 for native Grok Imagine 1.5 ($22.50, about 3.1 times LTX-2.3 Pro) and $0.14 for Grok Imagine 1.5 Lite ($12.60), which xAI renders at 720p and upscales. Grok Imagine tops out at 1080p; only LTX offers 1440p (from $0.12 per second, $10.80) and 4K (from $0.24, $21.60).
Is Grok Imagine or LTX cheaper on Runway?
LTX in the Runway app, Grok Imagine on the Runway API. In the app LTX 2.5 Fast costs 9 / 13 credits per second at 720p / 1080p and LTX 2.5 Pro 12 / 17, against 10 / 16 / 29 for Grok Imagine 1.5 (image-to-video) at 480p / 720p / 1080p (Runway Academy, Oct 30, 2026). On Standard annual credits ($12 for 625) a usable 30-second clip is $15.55 with LTX 2.5 Fast 720p vs $27.65 with Grok Imagine 1.5 720p, and $22.46 vs $50.11 at 1080p. The Runway API sells grok_imagine_1_5_lite at 2 / 3 / 14 credits per second ($0.01 a credit, the same as xAI direct) but no LTX model. The Runway app lists Grok Imagine 1.5 Lite at 10 / 15 / 70 credits, which conflicts with the API's 2 / 3 / 14, so check the credit cost in the app before you generate.
Do Grok Imagine and LTX include audio in the price?
Yes, both. xAI charges one price per resolution with generated audio on by default, and generate_audio=false gives a silent clip at the same price. The LTX API also generates audio by default and charges the same per second with or without it (generate_audio: false for silent video). So there is no silent discount on either, and the cheapest 720p clip with sound costs the same on both: $0.03 per second for Grok Imagine 1.5 Lite and LTX-2.3 Fast.
How do Grok Imagine and LTX bill you?
Both bill US dollars per second of generated video, one price per model and resolution. xAI charges Grok Imagine 1.5 and 1.5 Lite at 480p, 720p or 1080p, plus $0.01 per input image, for 1 to 15 seconds per generation. The LTX API charges LTX-2.3 and LTX-2.5 Fast or Pro at 720p, 1080p, 1440p or 4K from a prepaid balance with optional auto top-up; text-to-video and image-to-video cost the same, audio-to-video is billed on the input audio length (LTX-2.3 Pro costs more there, $0.06 per second at 720p), and with automatic duration you pay for the length the model produces. Through Runway both cost credits per second.