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RunwayGen-4 familyCurrentVideo generationReleased 1 Dec 2025

Runway Gen-4.5

Runway’s flagship text/image-to-video model. Runway’s API also resells third-party models (Veo, Seedance, etc.).

Model idgen4.5

Price$0.12 per second

Checked29 September 2026

Where it stands

17newer video generation models since its release

The 5 newest are listed. All video generation models

After it from Runway
Runway Aleph 2.021 May 2026
Weights
Closed weights; access is hosted only.

How to call it

2 ways to use Runway Gen-4.5, with the model id each provider expects.

Providers, model ids, endpoints and docs for Runway Gen-4.5
ProviderModel idEndpointDocs
Runway API gen4.5 https://api.dev.runwayml.com/v1/image_to_video docs.dev.runwayml.com
Web app app.runwayml.com

Pricing

Prices for Runway Gen-4.5
Per second$0.12

As published: “per second of video (12 credits/s at $0.01/credit; pro/HDR formats extra)”.

Source: docs.dev.runwayml.com, checked 29 September 2026.

Specs

Input
Text and images
Output
Video
Context window
Not published
Max output
Not published
Open weights
No
Licence
Proprietary
Released
1 December 2025
Status
Current
Type
Video generation

What stands out

What its maker marketed at launch, and what people found later, each with its source.

  • #1 on Artificial Analysis text-to-video at launch

    Launched as the top model on the Artificial Analysis Text-to-Video leaderboard (1,247 Elo), with better physics (liquids, momentum, collisions).

    Source: runway.com

  • HDR and professional output formats

    Found after launch

    API can output ProRes, PNG/EXR sequences, 10-bit SDR and HDR10/HLG/ACEScg masters (Gen-4.5 only for HDR).

    Source: docs.dev.runwayml.com

Notes

Announced 2025-12-01; added to Runway API 2026-02-10 (text-to-video and image-to-video, 2-10 s). Cheaper sibling gen4_turbo (5 credits/s). gen4_aleph and gen3a_turbo removed from API 2026-07-30. Requires header X-Runway-Version: 2024-11-06.

curl -X POST https://api.dev.runwayml.com/v1/image_to_video -H "Authorization: Bearer $RUNWAYML_API_SECRET" \
  -H "X-Runway-Version: 2024-11-06" -H "Content-Type: application/json" \
  -d '{"model":"gen4.5","promptText":"a drone shot over a misty fjord","ratio":"1280:720","duration":5}'
# poll GET https://api.dev.runwayml.com/v1/tasks/{id}

Sources: https://docs.dev.runwayml.com/guides/models/ , https://docs.dev.runwayml.com/guides/pricing/ , https://docs.dev.runwayml.com/api-details/api_changelog/ , https://runway.com/research/introducing-runway-gen-4.5