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Veo 3.1
Veo 3.1 generates four, six or eight second clips, with audio permanently enabled and no option to disable it. 4K support is present, but restricted to the eight-second clip, and reference capacity reaches up to three images.
- four, six or eight seconds
- audio always on
- three reference images
Last checked: This is a reference page. It is re-checked against the vendor sources and updated when a new version ships. Change log
Eight seconds, and the three operating conditions attached to it
Google documentation for this unit records three clip lengths: four, six and eight seconds. The eight-second tier is conditional, and the same documentation states the condition: eight seconds is available only when the output is 1080p or 4k, or when reference images are used. Resolution follows the same conditional structure: 1080p and 4k are active only on that eight-second clip.
So this unit 4K figure is not equivalent to Kling 4K figure. Kling provisions 4K at any clip length; Veo provisions it only at its own length ceiling. Both are recorded in full in the resolution column of our table, and this distinction belongs on this page.
Extension: the actual route to a longer video
Veo extends a video it generated earlier: seven seconds per operation, up to twenty times. On specification alone, that constitutes a long video. In operation there is a constraint the documentation states plainly: during extension, the output is 720p only. So either the long video or the 4K output is available — not both simultaneously.
Three-image reference capacity
The reference ceiling is three images, and the documentation notes this capability is active on the 3.1-series units only. Three, against fifty for Seedance 2.5 and seven for Kling, is the lowest figure in our table. It is sufficient for the operation "place this character in this scene." It is not sufficient to construct a consistent world with several characters and several products.
Why it remains a widely deployed choice despite these constraints
Because it is the only unit in this table reachable through a public, documented API with an ordinary key, and its technical documentation is readable without an account. For a team integrating video generation inside its own product, that single factor typically outweighs a clip twice as long.
Specifications
Every number here comes from the vendor's own page, with that page linked beside it.
- Unit identifier
- veo-3.1-generate-preview Source
- Input
- text, image Source
- Output
- video, audio Source
- Deployment surface
- Gemini API, Runway API Source
- Longest clip in one pass
- 8 seconds Source
- Resolution ceiling
- 4K Source
- Vertical resolution
- 2,160 lines of vertical resolution Source
- Native audio
- yes Source
- Reference input capacity
- 3 reference inputs Source
Using it from Iran
This column carries a date and says how it was checked, because most listicles guess it. Where we have only read a vendor policy page, the note below says exactly that.
- Reachable
- blocked
- Payment
- no working route
- Free tier
- no
- Measured on
How we checked: Google supported-countries list was checked and read directly today: the entry after Indonesia jumps straight to Iraq, and Iran is not recorded on this list. This finding comes from reading a document, not from a network measurement; a direct test from inside Iran has not yet been run.
Documented strengths
- Audio is permanently enabled, eliminating a separate step to add it
- 4K support on the eight-second clip, matched in this table only by Kling
- Seven-second extensions, up to twenty of them, on a video it generated itself
- Open, readable technical documentation, on Google public API
Room for improvement and technical considerations
- Eight seconds is the ceiling, and the shortest length in this table.
- 4K and 1080p are active only on the eight-second clip, not at four or six seconds.
- An extended output is 720p only, so a long video and 4K cannot be combined.
- Three-image reference capacity is the lowest figure in our table.
- Iran is not recorded on Google supported-countries list, and no official route exists.
Technical verdict
For integrating video generation inside software under development, this is the most straightforward integration path, and its technical documentation is readable in half an hour. For a workload where the finished output matters more than the route to producing it, the eight-second ceiling and three-image reference capacity become constraining quickly.
Frequently raised questions, with documented answers
How long a video does Veo 3.1 generate
Four, six or eight seconds. The eight-second tier is available only when the output is 1080p or 4k, or when reference images are used.
Can Veo produce a longer video
Through the extension operation, yes: seven seconds per operation, up to twenty times. But the output of the extension path is 720p only, so a long video is not produced in 4K.
Is an access route to Veo available from Iran
No official route exists. Iran is not recorded on Google supported-countries list; that list was checked directly today. This platform does not sell accounts and does not propose a route around this restriction.