Grok Imagine vs Runway is clip speed versus suite depth. Grok Imagine Video 1.5 turns a prompt or a still into a 1–15 s clip with native audio; Runway Gen-4.5 is one model inside a full editing app. Here is the spec-by-spec breakdown — credits included.
imaginegrok.org is independent and is not affiliated with xAI, X, or Runway. The generator on this site runs Grok Imagine video — short image-to-video clips at 480p or 720p from one still. This Grok Imagine vs Runway comparison — specifically Grok Imagine vs Runway Gen-4.5 — is drawn from xAI developer docs and Runway's own help-center, pricing, and developer pages, read October 31, 2026.
The workspace on this page runs Grok Imagine video — short image-to-video clips at 480p or 720p from one still. It does not run Runway. Use the Grok Imagine vs Runway breakdown below to decide which tool your brief needs.
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This Grok Imagine vs Runway demo shows only the Grok Imagine side: a 6 s image-to-video clip with native audio. We did not render a Runway Gen-4.5 clip for this page, so there is no side-by-side — only what Grok Imagine produced from one still.
Four clear steps from prompt to finished output — built for creators who want results without an X Premium maze.
Grok Imagine Video 1.5 takes text and image prompts, up to 14 reference images and 3 voice references, plus first/last frames and up to 4 keyframes. Clips run 1–15 s at native 1080p with lip-synced speech — or silent, with generate_audio=false.
Gen-4.5 takes Text to Video and Image to Video. Clips run 2–10 s at 720p, 24 or 25 fps, web only, on the Standard plan and higher. The Gen-4.5 spec page lists no audio output; audio on Runway comes from separate audio models.
The Runway app bundles Gen-4.5 with Aleph 2.0 video editing (140 credits per 5 s), third-party models such as Kling 4.0 and Seedance 2.0 Pro at 1080p, Gen-4 Image, Nano Banana Pro, and audio models — plus Explore Mode with infinite generations. Grok Imagine is a single-clip generator.
The Grok Imagine vs Runway decision follows the output. A 15 s talking clip, a 21:9 canvas, or pinned keyframes leans Grok Imagine. A timeline, an edit, and several models in one subscription leans Runway.
Capabilities tuned for the keyword intent of this page — not a generic feature dump.
Grok Imagine Video 1.5: text/image-to-video, 480p / 720p / native 1080p, 1–15 s, up to 14 reference images and 3 voice references, first/last frame plus up to 4 keyframes, native audio with lip-synced speech, aspect ratios 1:1, 16:9, 9:16, 4:3, 3:4, 3:2, 2:3, 21:9, and 5:2. Runway Gen-4.5: Text to Video and Image to Video, 2–10 s, 720p at 24 or 25 fps, web only, Standard plan and higher, Explore Mode infinite generations, T2V 16:9 only, I2V 16:9, 9:16, 1:1, 4:3, 3:4, and 21:9.
Grok Imagine Video 1.5 renders 1–15 s clips at native 1080p. Runway Gen-4.5 renders 2–10 s clips at 720p — 1080p is not offered on Gen-4.5, though other models in the Runway app list 1080p. The Grok Imagine vs Runway length gap (15 s versus 10 s) matters for social cuts that must ship as one clip.
Grok Imagine Video 1.5 ships native audio with lip-synced speech, accepts 3 voice references, and can render silent clips with generate_audio=false. The Runway Gen-4.5 spec page lists no audio output; the Runway app sells audio separately through models like Seed Audio, Lyria 3, and Text to Speech. Do not assume Gen-4.5 clips arrive with sound.
Grok Imagine Video 1.5 renders nine aspect ratios and pins a first frame, a last frame, and up to 4 keyframes. Gen-4.5 text-to-video is 16:9 (1280x720) only; image-to-video adds 9:16, 1:1 (960x960), 4:3, 3:4, and 21:9, and the spec page lists no keyframe control. For pinned shots, the Grok Imagine vs Runway question answers itself.
Runway bills Gen-4.5 at 12 credits per second — 60 credits per 5 s — at $15/mo Standard (625 credits, about 52 s), $35/mo Pro (2,250 credits, 187 s), or $95/mo Max (9,500 credits, 791 s); Standard and Pro credits do not roll over. The xAI API prices Grok Imagine Video 1.5 at $0.08/s 480p, $0.14/s 720p, and $0.25/s 1080p. Three ledgers; never mix them.
Runway's editing suite is real: Aleph 2.0 video editing costs 140 credits per 5 s in the app and $0.28/s on the Runway API (minimum $0.56 per generation, output resolution matches the input video). Grok Imagine editing and extension live on grok-imagine-video, not 1.5: extend adds 2–10 s, edit accepts sources up to 8.7 s, both capped at 720p.
imaginegrok.org generates short Grok Imagine image-to-video clips at 480p or 720p from one still. It is independent, not affiliated with xAI, X, or Runway, and it does not run Runway. A default 5 s 480p clip here is 2 credits — see /pricing. Site credits are unrelated to Runway credits and to xAI API prices.
A 15 s talking clip, a voice reference, or pinned keyframes leans Grok Imagine Video 1.5. A multi-shot edit, a ProRes export, or several models under one subscription leans the Runway suite. The Grok Imagine vs Runway choice is a workflow question before it is a quality question.
Gen-4.5 at 60 credits per 5 s means a Standard month is roughly 52 s of generation. The xAI API runs $0.08–$0.25 per second by resolution. On imaginegrok.org a default 5 s 480p clip is 2 credits — see /pricing. Runway credits, xAI API dollars, and site credits are separate ledgers.
Gen-4.5 requires the Standard plan and higher and runs web only; Runway Free is a one-time 125 credits that do not expire. Explore Mode's infinite generations are the suite's drawing card. Grok Imagine is buyable per second on the xAI API, or per clip with credits here.
If you already know the first frame, the last frame, and two beats between them, Grok Imagine Video 1.5 pins up to 4 keyframes. Gen-4.5 lists no keyframe control on its spec page. See /grok-imagine-keyframes for the workflow.
On imaginegrok.org, the Grok Imagine vs Runway question is external — this site's workspace is image-to-video at 480p or 720p. Start at /grok-image-to-video or /grok-imagine-1-5.
One still in, one short clip out, native audio included. The Grok Imagine loop is shorter than any suite when the deliverable is a single vertical cut.
Aleph 2.0 editing, Gen-4 Image, Nano Banana Pro, and third-party video models in one app, with Explore Mode for infinite drafts — the Runway suite earns its subscription when the edit is the product.
The xAI API sells Grok Imagine Video 1.5 at $0.08/s 480p to $0.25/s 1080p. The Runway API sells Gen-4.5 at $0.12/s with a 2-second minimum, 720p only. The Grok Imagine vs Runway API math favors Grok at 480p and 1080p, Runway slightly at 720p.
Runway's credits (12/s, monthly, no rollover on Standard/Pro) and xAI's per-second dollars do not convert. This page keeps the Grok Imagine vs Runway numbers side by side instead of blending them.
Grok Imagine Video 1.5 (xAI docs: https://docs.x.ai/developers/model-capabilities/video/overview) against Runway Gen-4.5 (help center: https://help.runwayml.com/hc/en-us/articles/46974685288467-Creating-with-Gen-4-5), as documented: | Axis | Grok Imagine Video 1.5 | Runway Gen-4.5 | | Inputs | text-to-video + image-to-video; up to 14 reference images, 3 voice references | Text to Video + Image to Video | | Duration | 1–15 s per clip | 2–10 s | | Resolution | 480p / 720p / native 1080p | 720p only | | Frame rate | not stated in the xAI docs | 24 or 25 fps | | Audio | native, lip-synced speech, generate_audio=false for silent | spec page lists no audio output | | Aspect ratios | 1:1, 16:9, 9:16, 4:3, 3:4, 3:2, 2:3, 21:9, 5:2 | T2V 16:9 (1280x720) only; I2V 16:9, 9:16, 1:1 (960x960), 4:3, 3:4, 21:9 | | Frame control | first + last frame, plus up to 4 keyframes | no keyframes listed on the spec page | | Editing / extension | grok-imagine-video: extend 2–10 s, edit sources up to 8.7 s, up to 720p | Aleph 2.0 editing in the suite: 140 credits per 5 s | | Access | xAI API per second; credits on this site | web only; Standard plan ($15/mo) and higher | | API price | $0.08/s 480p, $0.14/s 720p, $0.25/s 1080p | $0.12/s, 2 s minimum | Read the two columns as different products. Grok Imagine vs Runway is a single-clip generator versus a creative suite that happens to contain one.
Runway plans (https://runway.com/pricing): Free is a one-time 125 credits that do not expire. Standard is $15/mo ($12/mo billed annually) with 625 credits/mo — about 52 s of Gen-4.5 at 12 credits per second. Pro is $35/mo ($28/mo annual) with 2,250 credits/mo (187 s). Max is $95/mo ($76/mo annual) with 9,500 credits/mo (791 s). Gen-4.5 costs 60 credits per 5 s. Standard and Pro credits do not roll over; Max rolls over up to one month; purchased extra credits never expire (minimum purchase 1,000). ProRes or PNG-sequence export on Max, Unlimited (Legacy), and Enterprise adds 5 credits/s. API side (https://dev.runway.com/pricing): Gen-4.5 is $0.12 per second with a 2-second minimum; Gen-4 Turbo is $0.05/s; Aleph 2.0 is $0.28/s with a $0.56 minimum per generation. xAI (https://docs.x.ai/developers/pricing) sells Grok Imagine Video 1.5 at $0.08/s 480p, $0.14/s 720p, and $0.25/s 1080p, with Lite at $0.02 / $0.03 / $0.14 (1080p upscaled from 720p). So the honest per-second math: Grok Imagine undercuts Gen-4.5 at 480p ($0.08 versus $0.12), Runway is slightly cheaper at 720p ($0.12 versus $0.14), and only Grok sells native 1080p ($0.25). On imaginegrok.org the third ledger is site credits: a default 5 s 480p clip is 2 credits, and a still is 2 credits — see /pricing. imaginegrok.org credits are not Runway credits and not xAI API dollars.
Runway sells a workspace, not a model. Beyond Gen-4.5, the app lists Aleph 2.0 video editing (140 credits per 5 s), Kling 4.0 and Seedance 2.0 Pro at 1080p, Gen-4 Image and Gen-4 Image Turbo, Nano Banana Pro images, and audio models including Seed Audio, Lyria 3, and Text to Speech. Explore Mode lists infinite generations for exploring. If your week is generate, edit, score, and export, that bundle is the Runway argument. Grok Imagine Video 1.5 is narrower: 1–15 s clips, native audio with lip-synced speech, 14 reference images, 3 voice references, and up to 4 keyframes. Editing and extension are handled by grok-imagine-video rather than 1.5 — extend adds 2–10 s, edit accepts sources up to 8.7 s, both capped at 720p (https://docs.x.ai/developers/model-capabilities/video/overview). The Grok Imagine vs Runway trade is exactly this: suite versus clip.
Pick Grok Imagine when the deliverable is one clip: 1–15 s, native audio with lip-synced speech, up to 4 keyframes, 14 reference images, nine aspect ratios, and per-second pricing that starts at $0.08. That includes every "still to short clip" job this site exists for. Pick Runway when the deliverable is an edit: Aleph 2.0 timeline work, several models (including third-party video at 1080p) under one subscription, audio models, ProRes/PNG export on top tiers, and Explore Mode drafts. Gen-4.5 itself is 2–10 s at 720p with no audio listed on its spec page. If you are already on imaginegrok.org, you are on the Grok Imagine side — short image-to-video clips at 480p/720p. Start at /grok-imagine-1-5 or /grok-image-to-video, pin shots with /grok-imagine-keyframes, and buy volume on /pricing. For other head-to-heads see /grok-imagine-vs-veo and /grok-imagine-vs-seedance; for non-Grok options /grok-imagine-alternative. imaginegrok.org is independent and is not affiliated with xAI, X, or Runway.
