minimax-h3-max/image-to-video
MiniMax H3 Max: text or image to video with native audio at 480p/768p
This page is the video-to-video editor in Runway's in-context line. You upload a clip, describe the change, and the model applies that request while the rest of the shot stays put. On RunComfy, Runway Aleph 2 starts from a source video plus a short instruction, then optionally pins stills to timestamps so a product, wardrobe, or look holds at those moments.
Output format: Video / 2–30 second source / up to 1080p / frame shape follows the input unless you set an expand ratio
Use these fields on the RunComfy model UI. Names match the Input schema for Runway Aleph 2.
| Parameter | Required | Type | Default | Range / Options | Description |
|---|---|---|---|---|---|
| video_url* | Yes (*) | string (video) | Example clip | 2–30s, under 16 MB | Source video to edit. Output length follows this clip. |
| prompt* | Yes (*) | string | Example edit | Max 1000 characters | Natural-language instruction describing the change. |
| keyframes | No | array | None | 0–5 items | Guidance images. Each item needs image_url plus seconds (0–30). |
| seed | No | integer | Random | 0–4294967295 | Optional seed for more repeatable retries. |
| target_aspect_ratio | No | string | Follow source | 16:9, 4:3, 3:2, 1:1, 2:3, 3:4, 9:16, 21:9 | Expand/outpaint target. Omit to keep the source frame. |
Billing on RunComfy follows the source video duration.
| Billing unit | Rate |
|---|---|
| Per second of source video | $0.369 |
Estimated cost examples for Runway Aleph 2
| Source length | Approx. cost |
|---|---|
| 2s (minimum) | ~$0.74 |
| 5s | ~$1.85 |
| 10s | ~$3.69 |
| 30s (maximum) | ~$11.07 |
Charges use the measured clip length, rounded up to a whole second and clamped between 2 and 30 seconds.
On RunComfy, teams iterate on Runway Aleph 2 without rebuilding the source timeline.
MiniMax H3 Max: text or image to video with native audio at 480p/768p
Generate cinematic 3-15s videos from text with optional sound.
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Transform reference clips with cinematic fidelity, refined motion, and seamless style control for creative professionals.
Pro-tier image animation: 3-15s cinematic clips from $0.111 per second.
Runway Aleph 2 is an in-context video-to-video editor. You provide a 2–30 second source clip and a written instruction, and it applies that change while leaving the rest of the shot in place. Typical jobs include product swaps, wardrobe or lighting changes, weather shifts, and style restyles on footage you already have.
Runway Aleph 2 accepts longer sources (2–30 seconds, up to 1080p) and can carry one edit across multiple cuts in the same clip. It also takes up to five timestamped keyframe images instead of a single image reference. The original Aleph identifier is retired on the current Runway API.
Yes. Runway Aleph 2 accepts up to five optional keyframes. Each keyframe needs an image URL and a timestamp in seconds from the start of the source clip (0–30). Use early seconds for an opening look and later seconds for an end-card or product hold.
The source video for Runway Aleph 2 must be 2–30 seconds and under 16 MB. The prompt is limited to 1000 characters. Keyframes are optional and capped at five. Output aspect follows the source unless you set target_aspect_ratio for expand/outpaint.
That is the design intent of Runway Aleph 2: change what you named in the prompt and keep motion, blocking, and lighting that you did not mention. Results still vary with prompt clarity and source quality, so review the output before you lock a take.
Yes. Prototype Runway Aleph 2 in the RunComfy Playground Web UI, then call the same model through the RunComfy API with the same parameters. You do not host or scale the model yourself. Generations consume usd / credits on your RunComfy account.
Runway Aleph 2 is billed at $0.369 per second of source video duration. A 2 second clip is about $0.74, 5 seconds about $1.85, and 30 seconds about $11.07. Measured length is rounded up to a whole second and clamped between 2 and 30 seconds.
Pick Runway Aleph 2 when you already have a usable take and need a controlled rewrite—SKU swap, campaign colorway, time-of-day shift—without a reshoot. If you need new motion between two stills, a first-and-last-frame generator is a better fit than this video-to-video editor.
RunComfy is the premier ComfyUI platform, offering ComfyUI online environment and services, along with ComfyUI workflows featuring stunning visuals. RunComfy also provides AI Models, enabling artists to harness the latest AI tools to create incredible art.
