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Aleph 2

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runway/aleph2 · by Runway · Diffusion transformer (DiT)

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About this offering: Runway Aleph 2 (aleph2) — video-to-video editing model on /v1/video_to_video. Accepts an existing video clip and generates a modified version via prompt guidance and/or up to 5 timed keyframe images. Successor to deprecated gen4_aleph. Operators use this for video style re-rendering, keyframe-guided retiming, and outpainting to new aspect ratios. Minimum 56 credits per call.

Standard

  • $0.01 / credit Current 2026-07-02 → present
    $0.01/credit is the flat pay-per-use rate on the Runway developer API. 28 credits/second confirmed from…

    $0.01/credit is the flat pay-per-use rate on the Runway developer API. 28 credits/second confirmed from pricing table. 56-credit minimum per call (≈2s minimum). Effective rate: $0.28/second.

Showing the active price and any recorded history. Full pricing history is available via the paid API — see API docs.

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Capability profile

How Aleph 2 rates across core capability dimensions, with the task-level evidence behind each rating.

image to video quality Weak

V2V only — does not accept a static image as start-frame input.

Prompt adherence Moderate

Prompt steers the output but the input video anchors motion and composition.

temporal consistency Strong

Input video provides temporal reference, improving consistency across frames.

motion quality Moderate
native audio Weak

No audio generation.

Inference speed Moderate

28 credits/s at $0.01/credit = $0.28/s; mid-range for Runway's lineup.

clip duration ceiling Strong

Accepts input video up to 30 seconds (vs 10s limit on gen4_turbo and gen4.5).

cost efficiency Moderate

$0.28/s with a 56-credit minimum ($0.56/call). Moderate cost for a specialized editing workflow; no cheaper V2V alternative on Runway.

video editing Moderate

API accepts an existing video + optional text prompt + up to 5 timed guidance images (keyframes at specific timestamps) + outpainting to different aspect ratios. Keyframe guidance is a form of timed reference conditioning that goes beyond simple I2V start-frame anchoring. No mask-guided inpainting or element/background replacement. Successor to the deprecated gen4_aleph, which had a references[] image array not carried forward to aleph2.

Operator guidance

The only Runway model for video-to-video workflows. At $0.28/s (28 credits × $0.01, 56-credit minimum) with up to 30s input, choose aleph2 when you have an existing video clip to modify rather than generating from scratch. For new video generation: gen4.5 ($0.12/s, T2V+I2V) or gen4_turbo ($0.05/s, I2V only). The keyframe guidance system can steer content at specific timestamps; outpainting expands the aspect ratio of the input clip.

Use cases

Limitations

Citations