Kling 3.0 - Pro Pack on RunComfy

runcomfy.com · docs · GitHub

Kling 3.0 is Kuaishou Technology's third-generation cinematic video model. This skill covers all six Kling 3.0 rendering endpoints on RunComfy: three quality tiers (Standard, Pro, 4K) across two modes (text-to-video and image-to-video).

What Kling 3.0 is

Kling 3.0 is the V3 generation of the Kling video model. It produces multi-shot cinematic video with synchronized native audio, consistent character identity across shots, and physics-aware motion. Compared to Kling 2.x, Kling 3.0 supports longer clips (up to 15 seconds), native 4K output on the 4K tier, and a unified multi-prompt segment system that lets one Kling 3.0 generation contain several distinct scenes with controlled transitions.

Kling 3.0 ships in three rendering tiers on RunComfy, each available as text-to-video or image-to-video:

• Standard - cheapest tier, up to 1080p output. Use Kling 3.0 Standard for fast iteration, previews, A/B variants, social shorts.
• Pro - highest fidelity at 1080p. Use Kling V3.0 Pro for hero-quality 1080p clips where motion realism and identity preservation matter most.
• 4K - native 3840x2160 output. Use Kling V3.0 4K for high-resolution brand films, big-screen cinematic sequences, and finished masters at native resolution.

All three tiers share the same Kling 3.0 multi-shot architecture. Tiers differ in resolution ceiling, motion-fidelity budget, and pricing.

The 6 Kling 3.0 endpoints

Each endpoint corresponds to one (tier, mode) pair. All six endpoints share the same Kling 3.0 base model.

Endpoint	Anchor	Resolution	Rate (no audio)	Rate (with audio)
kling/kling-3.0/standard/text-to-video	Kling 3.0 Standard t2v	up to 1080p	$0.084/s	$0.126/s
kling/kling-3.0/standard/image-to-video	Kling 3.0 Standard Image to Video	up to 1080p	$0.084/s	$0.126/s
kling/kling-3.0/pro/text-to-video	Kling V3.0 Pro Text-to-Video	1080p	$0.112/s	$0.168/s
kling/kling-3.0/pro/image-to-video	Kling V3.0 Pro Image-to-Video	1080p	$0.112/s	$0.168/s
kling/kling-3.0/4k/text-to-video	Kling V3.0 4K Text-to-Video	3840x2160	$0.42/s flat	$0.42/s flat
kling/kling-3.0/4k/image-to-video	Kling V3.0 4K Image-to-Video	3840x2160	$0.42/s flat	$0.42/s flat

The 4K tier prices the same regardless of audio. Standard and Pro tiers charge ~50% more per second when audio is enabled.

When to pick which Kling 3.0 tier

Pick a Kling 3.0 tier based on the output's role in the pipeline.

• Drafts, previews, social shorts, A/B variants: Kling 3.0 Standard. Cheapest. Quality is fine for everything except hero shots.
• Hero 1080p clips, ad creative, talking heads with high motion fidelity: Kling V3.0 Pro. About 33% more expensive than Standard for noticeably tighter motion and identity hold at the same resolution.
• 4K brand films, big-screen cinematic, finished masters: Kling V3.0 4K. Native 3840x2160 (no upscale step). Flat $0.42/s makes budgeting predictable. Use only when the output truly needs 4K - it is roughly 5x the cost of Standard.

Pick the mode based on whether you have a source image:

• Text-to-Video (t2v): prompt only, Kling 3.0 generates the look from scratch. Use Kling 3.0 t2v for novel scenes, brand new compositions, environments without an existing reference.
• Image-to-Video (i2v): prompt + source image, Kling 3.0 animates the image. Use Kling 3.0 i2v when you have an exact reference (face, product, scene) that must survive into the output.

If the user explicitly asked for Kling 3.0, Kling V3.0, Kling Pro, or Kling 4K, route to this skill regardless.

Prerequisites

1. RunComfy CLI: npm i -g @runcomfy/cli
2. RunComfy account: runcomfy login opens a browser device-code flow.
3. CI / containers: set RUNCOMFY_TOKEN=<token> instead of runcomfy login.
4. For i2v endpoints: a publicly fetchable source image URL (HTTPS, JPEG/PNG/WebP).

Input schema (shared across all 6 Kling 3.0 endpoints)

Field	Type	Required	Default	Notes
prompt	string	yes	-	Text description of scene, motion, camera, atmosphere. Multi-segment prompts supported via prompt_segments for scene transitions in one Kling 3.0 generation.
image_url	string	yes (i2v only)	-	Source image for Kling 3.0 i2v. HTTPS URL. JPEG/PNG/WebP.
tail_image_url	string	no (i2v only)	-	Optional ending image for controlled start-to-end frame transition on Kling 3.0 i2v.
negative_prompt	string	no	-	Elements to exclude from the Kling 3.0 output.
duration	int	no	5	3-15 seconds per Kling 3.0 generation.
aspect_ratio	enum	no	16:9	16:9, 9:16, 1:1, 4:3, 3:4, 21:9.
cfg_scale	float	no	0.5	Prompt guidance strength. Higher = stricter adherence to prompt.
generate_audio	bool	no	false	Enable Kling 3.0 in-pass synchronized audio. Adds cost on Standard and Pro tiers; flat-rate on 4K.
seed	int	no	-	Reproducibility for Kling 3.0 variant testing.

How to invoke each Kling 3.0 endpoint

Kling 3.0 Standard text-to-video (cheapest 1080p draft):

runcomfy run kling/kling-3.0/standard/text-to-video \
  --input '{
    "prompt": "<Kling 3.0 prompt>",
    "duration": 5,
    "aspect_ratio": "16:9"
  }' \
  --output-dir <absolute/path>

Kling 3.0 Standard image-to-video (animate a still):

runcomfy run kling/kling-3.0/standard/image-to-video \
  --input '{
    "prompt": "<motion description for Kling 3.0 i2v>",
    "image_url": "https://.../source.jpg",
    "duration": 5
  }' \
  --output-dir <absolute/path>

Kling V3.0 Pro text-to-video (highest 1080p fidelity):

runcomfy run kling/kling-3.0/pro/text-to-video \
  --input '{
    "prompt": "<Kling 3.0 Pro prompt>",
    "duration": 8,
    "aspect_ratio": "16:9",
    "generate_audio": true
  }' \
  --output-dir <absolute/path>

Kling V3.0 Pro image-to-video (hero animation from source image):

runcomfy run kling/kling-3.0/pro/image-to-video \
  --input '{
    "prompt": "<motion description for Kling V3.0 Pro i2v>",
    "image_url": "https://.../subject.jpg",
    "duration": 8,
    "generate_audio": true
  }' \
  --output-dir <absolute/path>

Kling V3.0 4K text-to-video (native 4K cinematic):

runcomfy run kling/kling-3.0/4k/text-to-video \
  --input '{
    "prompt": "<Kling V3.0 4K prompt>",
    "duration": 10,
    "aspect_ratio": "16:9",
    "generate_audio": true
  }' \
  --output-dir <absolute/path>

Kling V3.0 4K image-to-video (4K animation of a reference image):

runcomfy run kling/kling-3.0/4k/image-to-video \
  --input '{
    "prompt": "<motion description for Kling V3.0 4K i2v>",
    "image_url": "https://.../source-4k.jpg",
    "duration": 10,
    "generate_audio": true
  }' \
  --output-dir <absolute/path>

The CLI submits the Kling 3.0 request, polls every 2s, fetches the result, and downloads any *.runcomfy.net / *.runcomfy.com URL into --output-dir.

Prompting Kling 3.0 - what works

Kling 3.0 responds to specific prompting patterns better than naive prose.

Lead with motion and camera language. Kling 3.0 reads "wide shot, slow push-in", "tracking shot, low angle", "handheld follow" as real directives. Front-load these.

Multi-shot in one Kling 3.0 generation. A single Kling 3.0 prompt can describe a sequence of shots. Number them: "Shot 1: wide of the cafe at dusk. Shot 2: medium close-up of the barista. Shot 3: tight on the espresso pour." Kling 3.0 will preserve identity (face, wardrobe, props) across the shots.

Identity anchors for i2v. When using Kling 3.0 i2v, restate what should remain stable: "preserve the subject's face, pose, and clothing; only the camera moves and the background changes."

tail_image_url for controlled endings. On Kling 3.0 i2v, supply a tail image to lock the final frame. Kling 3.0 will interpolate motion from source to tail.

generate_audio: true for one-pass dialogue. Describe what Kling 3.0 should produce in audio: "warm friendly tone, English voiceover" or "city ambience, distant traffic, no dialogue." Audio adds cost on Standard / Pro; flat on 4K.

cfg_scale tuning. Default 0.5 works for most Kling 3.0 prompts. Raise to 0.7-0.9 for strict prompt adherence on stylized output. Lower to 0.3-0.4 for natural motion when the prompt is loose.

Anti-patterns:

• Conflicting style cues in one Kling 3.0 prompt -> simplify, pick one or two style anchors.
• Asking for greater than 15 seconds in one Kling 3.0 call -> 422 error; segment the script and stitch.
• Aspect ratios outside the supported set -> rejected.
• For Kling V3.0 4K, demanding aggressive multi-shot story plus 15s plus dialogue plus 6 cuts -> Kling 3.0 will deliver, but cost climbs to about $6.30 per generation. Validate with Standard first.

Where Kling 3.0 shines

Use case	Best Kling 3.0 endpoint
Cinematic 1080p brand stories with consistent characters	Kling V3.0 Pro (t2v or i2v)
Native 4K hero films and big-screen cinematic	Kling V3.0 4K (t2v or i2v)
Cheap iteration, social-first shorts, A/B variants	Kling 3.0 Standard t2v
Animating brand assets, product photos, character art	Kling 3.0 Standard i2v or Kling V3.0 Pro i2v
Multi-shot ads with synchronized dialogue in one pass	Kling V3.0 Pro with generate_audio: true
Premium 4K finished masters with native audio	Kling V3.0 4K with generate_audio: true (flat rate)

Sample Kling 3.0 prompts

Kling 3.0 cinematic multi-shot (Pro tier recommended):

Cinematic multi-shot of a young American couple celebrating their
anniversary at a candlelit rooftop restaurant. Shot 1: wide of the
city skyline at golden hour. Shot 2: medium two-shot, the couple
toasting. Shot 3: tight on the woman's smile, soft bokeh, warm fill
light. Subtle ambient string music, gentle wind, distant traffic.

Kling 3.0 i2v (animate a portrait, 4K tier):

Gentle camera dolly-in on the subject from the source image. Subtle
breathing motion, identity-stable features, soft natural light,
shallow depth of field. Background: warm golden-hour glow with a
slow drift of dust motes. No dialogue, only ambient room tone.

Kling 3.0 vertical short (Standard tier, 9:16):

9:16 vertical. A barista in a black apron pulls a single espresso
shot, steam rising into morning sun, rich crema slowly forming.
Close-up handheld, shallow depth of field, warm cafe ambience and
the hiss of the steam wand.

Kling 3.0 FAQ

What is the maximum duration of a Kling 3.0 clip? 15 seconds per generation across all three tiers. For longer narratives, segment the script into multiple Kling 3.0 calls and stitch.

How is Kling V3.0 4K priced compared to Standard and Pro? Kling V3.0 4K is a flat $0.42 per second whether or not audio is enabled. Standard is $0.084/s without audio (cheapest). Pro is $0.112/s without audio. The 4K tier costs roughly 5x Standard for the resolution upgrade.

Does Kling 3.0 support multi-shot in a single generation? Yes. All Kling 3.0 endpoints accept multi-segment prompts. Number the shots ("Shot 1:", "Shot 2:", etc.) and Kling 3.0 will preserve character identity across them.

Can Kling 3.0 generate audio? Yes. Set generate_audio: true. Kling 3.0 produces synchronized dialogue, ambient sound, and music in the same generation pass. On 4K the price stays flat at $0.42/s; on Standard / Pro the rate jumps about 50% with audio.

What aspect ratios does Kling 3.0 support? 16:9, 9:16, 1:1, 4:3, 3:4, 21:9. The 4K tier renders 21:9 as wide cinema crops at native 3840x2160.

Does Kling 3.0 i2v support a tail image? Yes. tail_image_url locks the final frame; Kling 3.0 interpolates motion from source to tail.

How is Kling 3.0 different from Kling 2.x? Kling 3.0 has stronger multi-shot identity preservation, longer max duration (15s vs 10s on the 2.x flagship), native 4K on the 4K tier, and unified multi-prompt segment input across all tiers.

Limitations

• Per-call duration cap 15 seconds on every Kling 3.0 tier.
• Maximum 6 continuous shots in one Kling 3.0 4K generation.
• i2v requires a publicly fetchable HTTPS image URL. Local files are not supported.
• Aspect ratios are fixed to the documented six. Other ratios get cropped or rejected.
• 4K output files are large. Plan disk and bandwidth before batch Kling V3.0 4K runs.

Exit codes

The runcomfy CLI uses sysexits-style codes:

code	meaning
0	Kling 3.0 generation succeeded
64	bad CLI args
65	bad input JSON for Kling 3.0 / schema mismatch
69	upstream 5xx
75	retryable: timeout / 429
77	not signed in or token rejected

Full reference: docs.runcomfy.com/cli/troubleshooting.

How it works

1. The skill picks one of six Kling 3.0 endpoints based on the user's tier (Standard / Pro / 4K) and mode (t2v / i2v) intent.
2. It invokes runcomfy run kling/kling-3.0/<tier>/<mode> with a JSON body matching the schema.
3. The CLI POSTs to the RunComfy Model API with the user's bearer token.
4. The Model API returns a request_id; the CLI polls every 2 seconds until the Kling 3.0 generation finishes.
5. On terminal status, the CLI fetches the Kling 3.0 result and downloads any .runcomfy.net / .runcomfy.com URL into --output-dir.
6. Ctrl-C cancels the in-flight Kling 3.0 request before billing.

Security & Privacy

• Token storage: runcomfy login writes the API token to ~/.config/runcomfy/token.json with mode 0600. Set RUNCOMFY_TOKEN env var in CI / containers.
• Input boundary: the Kling 3.0 prompt is passed as JSON via --input. The CLI does not shell-expand. No shell-injection surface.
• Third-party content: image URLs you pass are fetched by the RunComfy server, not by the CLI on your machine. Treat external URLs as untrusted; image-based prompt injection is a known risk for any video model that accepts image inputs.
• Outbound endpoints: only model-api.runcomfy.net (request submission) and *.runcomfy.net / *.runcomfy.com (download whitelist).
• Generated-file size cap: the CLI aborts any single download greater than 2 GiB to prevent disk-fill from a runaway Kling 3.0 4K output.