Comfy-Org/ComfyUI · error · ValueError

kling-video-o1 does not support 4k resolution.

Error message

kling-video-o1 does not support 4k resolution.

What it means

Client-side capability guard: kling-video-o1 does not support 4k resolution, so resolution == '4k' with that model raises before the request. The node maps 4k->mode '4k', 1080p->'pro', else 'std'; the guard fires before that mapping.

Source

Thrown at comfy_api_nodes/nodes_kling.py:705

    async def execute(
        cls,
        model_name: str,
        prompt: str,
        aspect_ratio: str,
        duration: int,
        resolution: str = "1080p",
        storyboards: dict | None = None,
        generate_audio: bool = False,
        seed: int = 0,
    ) -> IO.NodeOutput:
        _ = seed
        if model_name == "kling-video-o1":
            if duration not in (5, 10):
                raise ValueError("kling-video-o1 only supports durations of 5 or 10 seconds.")
            if generate_audio:
                raise ValueError("kling-video-o1 does not support audio generation.")
            if resolution == "4k":
                raise ValueError("kling-video-o1 does not support 4k resolution.")
        stories_enabled = storyboards is not None and storyboards["storyboards"] != "disabled"
        if stories_enabled and model_name == "kling-video-o1":
            raise ValueError("kling-video-o1 does not support storyboards.")
        validate_string(prompt, strip_whitespace=True, min_length=0 if stories_enabled else 1, max_length=2500)

        multi_shot = None
        multi_prompt_list = None
        if stories_enabled:
            count = int(storyboards["storyboards"].split()[0])
            multi_shot = True
            multi_prompt_list = []
            for i in range(1, count + 1):
                sb_prompt = storyboards[f"storyboard_{i}_prompt"]
                sb_duration = storyboards[f"storyboard_{i}_duration"]
                validate_string(sb_prompt, field_name=f"storyboard_{i}_prompt", min_length=1, max_length=512)
                multi_prompt_list.append(
                    MultiPromptEntry(
                        index=i,

View on GitHub (pinned to 1c6d8d45b3)

Solutions

1. Select 1080p (or another supported resolution) for kling-video-o1
2. If 4k output is mandatory, use the dedicated 4k-capable Kling model
3. Upsample the 1080p output with an upscaler node instead

Example fix

// before
model_name = "kling-video-o1"; resolution = "4k"

// after
model_name = "kling-video-o1"; resolution = "1080p"

def o1_resolution_ok(model_name: str, resolution: str) -> bool:
    return model_name != "kling-video-o1" or resolution != "4k"

assert o1_resolution_ok(model_name, resolution)

def resolution_supported(model_name: str, resolution: str) -> bool:
    return not (model_name == "kling-video-o1" and resolution == "4k")

try:
    out = await kling_t2v_node(model_name=model, resolution="4k", ...)
except ValueError as e:
    if "does not support 4k" in str(e):
        out = await kling_t2v_node(model_name=model, resolution="1080p", ...)
    else:
        raise

When it happens

Trigger: Model=kling-video-o1 with resolution='4k' selected; workflows that previously used kling-v2-master-4k switched to o1 keeping 4k; programmatic calls passing resolution='4k'.

Common situations: Changing the model dropdown but leaving resolution at 4k; assuming all current Kling tiers support 4k.

Related errors

• kling-video-o1 only supports durations of 5 or 10 seconds.
• kling-video-o1 does not support audio generation.
• kling-video-o1 does not support storyboards.
• Positive prompt is empty
• Positive prompt is too long: {len(prompt)} characters

AI-assisted analysis of Comfy-Org/ComfyUI@1c6d8d45b3 (2026-08-14). Data as JSON: /api/errors/71a164059e3d96c3. Report an issue: GitHub.