VideoGenReview

What each AI video model's release notes say changed

Gen-4.5: every dated change

Gen-4.5, in the Runway line: 3 entries, 11 December 2025 to 10 August 2026, covering new model, frames, resolution and access. Dated before it in this line: Aleph. As of 2026-09-25.

Gen-4.5 entries by dateOne dot per dated entry.Gen-4.5 entries by date2025-12-11Gen-4.5 is released for all paid plans2026-01-21Gen-4.5 takes a first frame image…2026-08-10Gen-4.5 and Aleph 2 outputs export as ProRes…
Fig. 1 One dot per dated entry.
Every Gen-4.5 entry, oldest first, read 2026-09-25.
DateWhat changedKindsSource
11 December 2025Gen-4.5 is released for all paid plansnew modelMaker's note
21 January 2026Gen-4.5 takes a first frame image with the promptframesMaker's note
10 August 2026Gen-4.5 and Aleph 2 outputs export as ProRes 4444 or PNG sequencesresolution, accessMaker's note

Inclusion rule. All entries filed under this version: the maker's notes, platform arrivals and undated rows. Order. By date, oldest first; undated rows last.

The entries for Gen-4.5 cluster around a new model or snapshot, start, end or middle frames and resolution, frame rate or shape.

1Each entry

11 December 2025, from Runway, changelog

Introducing Gen-4.5, the world's best video model. Now available for all paid plans.

Runway, changelog
  • Gen-4.5
    Gen-4.5 is released for all paid plansRunway, changelog / since 2025-12-11 / checked 2026-09-25

21 January 2026, from Runway, changelog

You can now supply a first frame image alongside your text prompt with Gen-4.5.

Runway, changelog
  • Gen-4.5 Image to Video
    Gen-4.5 takes a first frame image with the promptRunway, changelog / since 2026-01-21 / checked 2026-09-25

10 August 2026, from Runway, changelog

Tool Mode and Edit Studio now let you export Gen-4.5 and Aleph 2 generations as ProRes 4444 with PCM audio or a PNG sequence, instead of a compressed MP4.

Runway, changelog
  • ProRes / PNG Sequence Export
    Gen-4.5 and Aleph 2 outputs export as ProRes 4444 or PNG sequencesRunway, changelog / since 2026-08-10 / checked 2026-09-25

2Versions either side in this line

  • Dated before it: Aleph, 1 entry, first dated 31 July 2025.
  • Dated after it: Aleph 2.0, 1 entry, first dated 21 May 2026.

3Same kinds of change elsewhere, within six weeks

The whole line: Runway. Quarter: Q4 2025.

4Notes read