Grok Imagine Video vs Grok extend

Grok Imagine Video is 7 credits, text-to-video, native audio true, 720p, 6 / 10 / 15 / 20 / 30 seconds. Grok Imagine Extend is 8 credits, extend-video, audio false, 2s through 10s every second, resolution unset. Generate is the talking 720p sentence. Extend is a silent hop on a clip that already exists. Do not pay 8 expecting the line to keep going.

This is not Grok versus Flux. That comparison lives elsewhere. This page is in-family: 7-credit generate versus 8-credit continue. It is also not “Grok on X.” The catalog row is the job. The surface is a launcher.

The generate card: category text-to-video, no image required, audio true, 720p, five lengths, 7 credits. Description on the snapshot says image-to-video generation. The published category is text-to-video. Do not invent an I2V gate this slug does not list. If you have a still that must be frame one, this is the wrong door.

The extend card: category extend-video, audio false, 2–10s, 8 credits, no max resolution listed. Description: continue an existing Grok Imagine video at a chosen timestamp. In-family is the point. A translator this is not.

Seven credits is the talking 720p generate

Use Imagine Video when you need a new clip: a sentence, a 720p file, a soundtrack the model will bake because audio is true. Write whether anyone speaks. SKU orbits usually want Foley and no voice. Say “no speech.” A 7-credit surprise monologue is still a wasted take.

Length is the reason this row exists next to Veo. Veo 3.1 is 40 credits, 4K, 4 / 6 / 8 seconds, native audio. Grok is 7 credits, 720p, up to 30 seconds, native audio. If the insertion order is 4K in 8 seconds, stay on Veo 3.1. If the feed is 720p and the shot needs 15, 20, or 30 seconds in one pass, Grok is the cheap talking hold.

There is no 5s chip. The shortest generate is 6s. Draft at 6s. Step to 10s when the motion needs it. Use 15 / 20 / 30 when the shot is a phrase, not a glance. The slider going to 30 is not a compliment.

Seven credits is the catalog sticker. Do not convert it to USD. Do not call 7 “free.” It is the generate. Eight is the hop.

When Imagine Video is the pick:

• You have a sentence, not a still that must survive as frame one.
• 720p is the master, or 720p is look-dev you will upscale later on a different row.
• Native audio is the mix you want on the first pass.
• 6–30 seconds matches the brief.

When Imagine Video is the wrong pick:

• The last frame of a keeper is good and you only need more of that shot. That is extend.
• You needed 1080p or 4K as the generate ceiling. This card is 720p.
• You needed image-to-video. Category is text-to-video.

Eight credits is a silent hop

Extend continues picture. audio false means the hop will not grow the sentence, the bed, or the room tone the generate already baked. Plan the line on the 7-credit pass. Score already laid, mute feed, or replace sound in an editor: those are the honest extend briefs.

Duration: 2s through 10s. A 2s hop is a stitch. A 10s hop is a second beat. There is no 15s extend on this card. If you need 20 more seconds, you are asking the wrong row — or you generate a longer first pass. The generate already sells 20s and 30s at 7 credits. Extending a 6s take three times at 8 credits each is how 7 becomes 31 without a 30s plan.

Resolution is unset on extend. Do not promise 720p, 1080p, or 4K from a blank field. The hop inherits the keeper. If the keeper is 720p Grok, the hop is that picture continued, silent.

When extend is the pick:

• The keeper is a Grok Imagine clip.
• The last frame is good.
• The next beat is the same shot.
• You can live without new native audio on the hop.
• 2–10 seconds is enough.

When extend is the wrong pick:

• The first seconds are already wrong. Extend will grow the wrong take.
• The next beat is a new room or a new line. That is a new generate.
• The keeper is Veo, Flux, or Seedance. Stay in family. Flux 3 Extend Video is 21 credits, native audio true, 5–20 seconds, if the keeper is Flux.

Do not hop a talking Grok take and expect the mouth to keep the paragraph. The generate spoke. The extend is mute. Lay the rest of the line in an editor, or generate a longer first pass at 15 / 20 / 30.

Generate versus hop, in production order

1. Draft the sentence at 6s on Imagine Video. Listen. If the line is wrong, regenerate. Do not extend a bad hook.
2. If 6s is the ship length and 720p is enough, stop. You spent 7.
3. If the camera is still travelling and the last frame is good, hop 2–10s at 8. Budget the silence.
4. If you knew you needed 20s of talking picture, buy 20s on the generate. Do not assemble it from mute hops.

Grok Imagine extend vs Flux 3 extend is the cross-family continue. This page is the 7 versus 8 inside Grok. Do not restack that post. The only question here is: new clip, or more of this clip.

The AI video generator is the launcher. Captions still matter on a talking 720p file; mute autoplay will hide the native bed. Captions for silent autoplay is the typesetting. The AI caption generator burns the line. Extend will not caption either.

Article 50 still applies to photoreal people in the generate. Seven credits does not exempt a generated face. Label at first exposure for EU audiences since 2 August 2026. The Article 50 disclosure template is the copy. YouTube’s 27 May 2026 Shorts overlay does not care that extend was silent.

Sora 2 T2V was 10 credits, native audio, 720p, up to 20s. The Sora API shuts 24 September 2026 (OpenAI Help Centre, September 2026). A leftover Sora talking 720p brief is close to Imagine Video at 7. It is not close to extend at 8 unless you already have a Grok keeper. Map generate first.

What 8 is not

8 is not a discount on a 30-second talking file. 8 is not 4K. 8 is not I2V. 8 is not a reason to skip writing the sound into the 7-credit prompt. 8 is a silent 2–10s continue of a Grok clip.

If the cut still works without new sound on the hop, extend is cheap insurance. If the cut dies when the sentence stops, buy length on the generate.

Seven credits starts the file. Eight credits continues the picture. The microphone lives on the first row.

Run the generate you mean in Versely.

FAQ

Does Grok Imagine Extend keep the native audio from the generate?

No. Extend is audio false. The hop is picture. Write the line on the 7-credit generate, or lay sound after.

Why is extend more expensive than generate?

Seven credits buys a new 720p talking clip. Eight credits buys 2–10 more seconds of an existing Grok clip without a new soundtrack. Different category, not a coupon.

Can I extend a 6s take into a 30s talking hero?

Not on this extend card. Max hop is 10s and it is silent. If you need 30s with native audio, generate 30s on Imagine Video.