Merge branch 'master' into cbyrne/text-preview-support

comfy/model_base.py

@@ -925,6 +925,25 @@ class Flux(BaseModel):
             out['ref_latents'] = list([1, 16, sum(map(lambda a: math.prod(a.size()[2:]), ref_latents))])
         return out
 
+class LongCatImage(Flux):
+    def _apply_model(self, x, t, c_concat=None, c_crossattn=None, control=None, transformer_options={}, **kwargs):
+        transformer_options = transformer_options.copy()
+        rope_opts = transformer_options.get("rope_options", {})
+        rope_opts = dict(rope_opts)
+        rope_opts.setdefault("shift_t", 1.0)
+        rope_opts.setdefault("shift_y", 512.0)
+        rope_opts.setdefault("shift_x", 512.0)
+        transformer_options["rope_options"] = rope_opts
+        return super()._apply_model(x, t, c_concat, c_crossattn, control, transformer_options, **kwargs)
+
+    def encode_adm(self, **kwargs):
+        return None
+
+    def extra_conds(self, **kwargs):
+        out = super().extra_conds(**kwargs)
+        out.pop('guidance', None)
+        return out
+
 class Flux2(Flux):
     def extra_conds(self, **kwargs):
         out = super().extra_conds(**kwargs)

comfy/model_detection.py

@@ -279,6 +279,8 @@ def detect_unet_config(state_dict, key_prefix, metadata=None):
             dit_config["txt_norm"] = any_suffix_in(state_dict_keys, key_prefix, 'txt_norm.', ["weight", "scale"])
             if dit_config["yak_mlp"] and dit_config["txt_norm"]:  # Ovis model
                 dit_config["txt_ids_dims"] = [1, 2]
+            if dit_config.get("context_in_dim") == 3584 and dit_config["vec_in_dim"] is None:  # LongCat-Image
+                dit_config["txt_ids_dims"] = [1, 2]
 
         return dit_config
 

comfy/sd.py

@@ -60,6 +60,7 @@ import comfy.text_encoders.jina_clip_2
 import comfy.text_encoders.newbie
 import comfy.text_encoders.anima
 import comfy.text_encoders.ace15
+import comfy.text_encoders.longcat_image
 
 import comfy.model_patcher
 import comfy.lora
@@ -1160,6 +1161,7 @@ class CLIPType(Enum):
     KANDINSKY5_IMAGE = 23
     NEWBIE = 24
     FLUX2 = 25
+    LONGCAT_IMAGE = 26
 
 
 def load_clip(ckpt_paths, embedding_directory=None, clip_type=CLIPType.STABLE_DIFFUSION, model_options={}):
@@ -1372,6 +1374,9 @@ def load_text_encoder_state_dicts(state_dicts=[], embedding_directory=None, clip
             if clip_type == CLIPType.HUNYUAN_IMAGE:
                 clip_target.clip = comfy.text_encoders.hunyuan_image.te(byt5=False, **llama_detect(clip_data))
                 clip_target.tokenizer = comfy.text_encoders.hunyuan_image.HunyuanImageTokenizer
+            elif clip_type == CLIPType.LONGCAT_IMAGE:
+                clip_target.clip = comfy.text_encoders.longcat_image.te(**llama_detect(clip_data))
+                clip_target.tokenizer = comfy.text_encoders.longcat_image.LongCatImageTokenizer
             else:
                 clip_target.clip = comfy.text_encoders.qwen_image.te(**llama_detect(clip_data))
                 clip_target.tokenizer = comfy.text_encoders.qwen_image.QwenImageTokenizer

comfy/supported_models.py

@@ -25,6 +25,7 @@ import comfy.text_encoders.kandinsky5
 import comfy.text_encoders.z_image
 import comfy.text_encoders.anima
 import comfy.text_encoders.ace15
+import comfy.text_encoders.longcat_image
 
 from . import supported_models_base
 from . import latent_formats
@@ -1678,6 +1679,37 @@ class ACEStep15(supported_models_base.BASE):
         return supported_models_base.ClipTarget(comfy.text_encoders.ace15.ACE15Tokenizer, comfy.text_encoders.ace15.te(**detect))
 
 
-models = [LotusD, Stable_Zero123, SD15_instructpix2pix, SD15, SD20, SD21UnclipL, SD21UnclipH, SDXL_instructpix2pix, SDXLRefiner, SDXL, SSD1B, KOALA_700M, KOALA_1B, Segmind_Vega, SD_X4Upscaler, Stable_Cascade_C, Stable_Cascade_B, SV3D_u, SV3D_p, SD3, StableAudio, AuraFlow, PixArtAlpha, PixArtSigma, HunyuanDiT, HunyuanDiT1, FluxInpaint, Flux, FluxSchnell, GenmoMochi, LTXV, LTXAV, HunyuanVideo15_SR_Distilled, HunyuanVideo15, HunyuanImage21Refiner, HunyuanImage21, HunyuanVideoSkyreelsI2V, HunyuanVideoI2V, HunyuanVideo, CosmosT2V, CosmosI2V, CosmosT2IPredict2, CosmosI2VPredict2, ZImage, Lumina2, WAN22_T2V, WAN21_T2V, WAN21_I2V, WAN21_FunControl2V, WAN21_Vace, WAN21_Camera, WAN22_Camera, WAN22_S2V, WAN21_HuMo, WAN22_Animate, WAN21_FlowRVS, Hunyuan3Dv2mini, Hunyuan3Dv2, Hunyuan3Dv2_1, HiDream, Chroma, ChromaRadiance, ACEStep, ACEStep15, Omnigen2, QwenImage, Flux2, Kandinsky5Image, Kandinsky5, Anima]
+class LongCatImage(supported_models_base.BASE):
+    unet_config = {
+        "image_model": "flux",
+        "guidance_embed": False,
+        "vec_in_dim": None,
+        "context_in_dim": 3584,
+        "txt_ids_dims": [1, 2],
+    }
+
+    sampling_settings = {
+    }
+
+    unet_extra_config = {}
+    latent_format = latent_formats.Flux
+
+    memory_usage_factor = 2.5
+
+    supported_inference_dtypes = [torch.bfloat16, torch.float16, torch.float32]
+
+    vae_key_prefix = ["vae."]
+    text_encoder_key_prefix = ["text_encoders."]
+
+    def get_model(self, state_dict, prefix="", device=None):
+        out = model_base.LongCatImage(self, device=device)
+        return out
+
+    def clip_target(self, state_dict={}):
+        pref = self.text_encoder_key_prefix[0]
+        hunyuan_detect = comfy.text_encoders.hunyuan_video.llama_detect(state_dict, "{}qwen25_7b.transformer.".format(pref))
+        return supported_models_base.ClipTarget(comfy.text_encoders.longcat_image.LongCatImageTokenizer, comfy.text_encoders.longcat_image.te(**hunyuan_detect))
+
+models = [LotusD, Stable_Zero123, SD15_instructpix2pix, SD15, SD20, SD21UnclipL, SD21UnclipH, SDXL_instructpix2pix, SDXLRefiner, SDXL, SSD1B, KOALA_700M, KOALA_1B, Segmind_Vega, SD_X4Upscaler, Stable_Cascade_C, Stable_Cascade_B, SV3D_u, SV3D_p, SD3, StableAudio, AuraFlow, PixArtAlpha, PixArtSigma, HunyuanDiT, HunyuanDiT1, FluxInpaint, Flux, LongCatImage, FluxSchnell, GenmoMochi, LTXV, LTXAV, HunyuanVideo15_SR_Distilled, HunyuanVideo15, HunyuanImage21Refiner, HunyuanImage21, HunyuanVideoSkyreelsI2V, HunyuanVideoI2V, HunyuanVideo, CosmosT2V, CosmosI2V, CosmosT2IPredict2, CosmosI2VPredict2, ZImage, Lumina2, WAN22_T2V, WAN21_T2V, WAN21_I2V, WAN21_FunControl2V, WAN21_Vace, WAN21_Camera, WAN22_Camera, WAN22_S2V, WAN21_HuMo, WAN22_Animate, WAN21_FlowRVS, Hunyuan3Dv2mini, Hunyuan3Dv2, Hunyuan3Dv2_1, HiDream, Chroma, ChromaRadiance, ACEStep, ACEStep15, Omnigen2, QwenImage, Flux2, Kandinsky5Image, Kandinsky5, Anima]
 
 models += [SVD_img2vid]

comfy/text_encoders/ace15.py

@@ -328,14 +328,14 @@ class ACE15TEModel(torch.nn.Module):
                 return getattr(self, self.lm_model).load_sd(sd)
 
     def memory_estimation_function(self, token_weight_pairs, device=None):
-        lm_metadata = token_weight_pairs["lm_metadata"]
+        lm_metadata = token_weight_pairs.get("lm_metadata", {})
         constant = self.constant
         if comfy.model_management.should_use_bf16(device):
             constant *= 0.5
 
         token_weight_pairs = token_weight_pairs.get("lm_prompt", [])
         num_tokens = sum(map(lambda a: len(a), token_weight_pairs))
-        num_tokens += lm_metadata['min_tokens']
+        num_tokens += lm_metadata.get("min_tokens", 0)
         return num_tokens * constant * 1024 * 1024
 
 def te(dtype_llama=None, llama_quantization_metadata=None, lm_model="qwen3_2b"):

comfy/text_encoders/longcat_image.py

@@ -0,0 +1,184 @@
+import re
+import numbers
+import torch
+from comfy import sd1_clip
+from comfy.text_encoders.qwen_image import Qwen25_7BVLITokenizer, Qwen25_7BVLIModel
+import logging
+
+logger = logging.getLogger(__name__)
+
+QUOTE_PAIRS = [("'", "'"), ('"', '"'), ("\u2018", "\u2019"), ("\u201c", "\u201d")]
+QUOTE_PATTERN = "|".join(
+    [
+        re.escape(q1) + r"[^" + re.escape(q1 + q2) + r"]*?" + re.escape(q2)
+        for q1, q2 in QUOTE_PAIRS
+    ]
+)
+WORD_INTERNAL_QUOTE_RE = re.compile(r"[a-zA-Z]+'[a-zA-Z]+")
+
+
+def split_quotation(prompt):
+    matches = WORD_INTERNAL_QUOTE_RE.findall(prompt)
+    mapping = []
+    for i, word_src in enumerate(set(matches)):
+        word_tgt = "longcat_$##$_longcat" * (i + 1)
+        prompt = prompt.replace(word_src, word_tgt)
+        mapping.append((word_src, word_tgt))
+
+    parts = re.split(f"({QUOTE_PATTERN})", prompt)
+    result = []
+    for part in parts:
+        for word_src, word_tgt in mapping:
+            part = part.replace(word_tgt, word_src)
+        if not part:
+            continue
+        is_quoted = bool(re.match(QUOTE_PATTERN, part))
+        result.append((part, is_quoted))
+    return result
+
+
+class LongCatImageBaseTokenizer(Qwen25_7BVLITokenizer):
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.max_length = 512
+
+    def tokenize_with_weights(self, text, return_word_ids=False, **kwargs):
+        parts = split_quotation(text)
+        all_tokens = []
+        for part_text, is_quoted in parts:
+            if is_quoted:
+                for char in part_text:
+                    ids = self.tokenizer(char, add_special_tokens=False)["input_ids"]
+                    all_tokens.extend(ids)
+            else:
+                ids = self.tokenizer(part_text, add_special_tokens=False)["input_ids"]
+                all_tokens.extend(ids)
+
+        if len(all_tokens) > self.max_length:
+            all_tokens = all_tokens[: self.max_length]
+            logger.warning(f"Truncated prompt to {self.max_length} tokens")
+
+        output = [(t, 1.0) for t in all_tokens]
+        # Pad to max length
+        self.pad_tokens(output, self.max_length - len(output))
+        return [output]
+
+
+class LongCatImageTokenizer(sd1_clip.SD1Tokenizer):
+    def __init__(self, embedding_directory=None, tokenizer_data={}):
+        super().__init__(
+            embedding_directory=embedding_directory,
+            tokenizer_data=tokenizer_data,
+            name="qwen25_7b",
+            tokenizer=LongCatImageBaseTokenizer,
+        )
+        self.longcat_template_prefix = "<|im_start|>system\nAs an image captioning expert, generate a descriptive text prompt based on an image content, suitable for input to a text-to-image model.<|im_end|>\n<|im_start|>user\n"
+        self.longcat_template_suffix = "<|im_end|>\n<|im_start|>assistant\n"
+
+    def tokenize_with_weights(self, text, return_word_ids=False, **kwargs):
+        skip_template = False
+        if text.startswith("<|im_start|>"):
+            skip_template = True
+        if text.startswith("<|start_header_id|>"):
+            skip_template = True
+        if text == "":
+            text = " "
+
+        base_tok = getattr(self, "qwen25_7b")
+        if skip_template:
+            tokens = super().tokenize_with_weights(
+                text, return_word_ids=return_word_ids, disable_weights=True, **kwargs
+            )
+        else:
+            prefix_ids = base_tok.tokenizer(
+                self.longcat_template_prefix, add_special_tokens=False
+            )["input_ids"]
+            suffix_ids = base_tok.tokenizer(
+                self.longcat_template_suffix, add_special_tokens=False
+            )["input_ids"]
+
+            prompt_tokens = base_tok.tokenize_with_weights(
+                text, return_word_ids=return_word_ids, **kwargs
+            )
+            prompt_pairs = prompt_tokens[0]
+
+            prefix_pairs = [(t, 1.0) for t in prefix_ids]
+            suffix_pairs = [(t, 1.0) for t in suffix_ids]
+
+            combined = prefix_pairs + prompt_pairs + suffix_pairs
+            tokens = {"qwen25_7b": [combined]}
+
+        return tokens
+
+
+class LongCatImageTEModel(sd1_clip.SD1ClipModel):
+    def __init__(self, device="cpu", dtype=None, model_options={}):
+        super().__init__(
+            device=device,
+            dtype=dtype,
+            name="qwen25_7b",
+            clip_model=Qwen25_7BVLIModel,
+            model_options=model_options,
+        )
+
+    def encode_token_weights(self, token_weight_pairs, template_end=-1):
+        out, pooled, extra = super().encode_token_weights(token_weight_pairs)
+        tok_pairs = token_weight_pairs["qwen25_7b"][0]
+        count_im_start = 0
+        if template_end == -1:
+            for i, v in enumerate(tok_pairs):
+                elem = v[0]
+                if not torch.is_tensor(elem):
+                    if isinstance(elem, numbers.Integral):
+                        if elem == 151644 and count_im_start < 2:
+                            template_end = i
+                            count_im_start += 1
+
+        if out.shape[1] > (template_end + 3):
+            if tok_pairs[template_end + 1][0] == 872:
+                if tok_pairs[template_end + 2][0] == 198:
+                    template_end += 3
+
+        if template_end == -1:
+            template_end = 0
+
+        suffix_start = None
+        for i in range(len(tok_pairs) - 1, -1, -1):
+            elem = tok_pairs[i][0]
+            if not torch.is_tensor(elem) and isinstance(elem, numbers.Integral):
+                if elem == 151645:
+                    suffix_start = i
+                    break
+
+        out = out[:, template_end:]
+
+        if "attention_mask" in extra:
+            extra["attention_mask"] = extra["attention_mask"][:, template_end:]
+            if extra["attention_mask"].sum() == torch.numel(extra["attention_mask"]):
+                extra.pop("attention_mask")
+
+        if suffix_start is not None:
+            suffix_len = len(tok_pairs) - suffix_start
+            if suffix_len > 0 and out.shape[1] > suffix_len:
+                out = out[:, :-suffix_len]
+                if "attention_mask" in extra:
+                    extra["attention_mask"] = extra["attention_mask"][:, :-suffix_len]
+                    if extra["attention_mask"].sum() == torch.numel(
+                        extra["attention_mask"]
+                    ):
+                        extra.pop("attention_mask")
+
+        return out, pooled, extra
+
+
+def te(dtype_llama=None, llama_quantization_metadata=None):
+    class LongCatImageTEModel_(LongCatImageTEModel):
+        def __init__(self, device="cpu", dtype=None, model_options={}):
+            if llama_quantization_metadata is not None:
+                model_options = model_options.copy()
+                model_options["quantization_metadata"] = llama_quantization_metadata
+            if dtype_llama is not None:
+                dtype = dtype_llama
+            super().__init__(device=device, dtype=dtype, model_options=model_options)
+
+    return LongCatImageTEModel_

comfy_extras/nodes_images.py

@@ -706,8 +706,8 @@ class SplitImageToTileList(IO.ComfyNode):
     @staticmethod
     def get_grid_coords(width, height, tile_width, tile_height, overlap):
         coords = []
-        stride_x = max(1, tile_width - overlap)
-        stride_y = max(1, tile_height - overlap)
+        stride_x = round(max(tile_width * 0.25, tile_width - overlap))
+        stride_y = round(max(tile_width * 0.25, tile_height - overlap))
 
         y = 0
         while y < height:
@@ -764,34 +764,6 @@ class ImageMergeTileList(IO.ComfyNode):
             ],
         )
 
-    @staticmethod
-    def get_grid_coords(width, height, tile_width, tile_height, overlap):
-        coords = []
-        stride_x = max(1, tile_width - overlap)
-        stride_y = max(1, tile_height - overlap)
-
-        y = 0
-        while y < height:
-            x = 0
-            y_end = min(y + tile_height, height)
-            y_start = max(0, y_end - tile_height)
-
-            while x < width:
-                x_end = min(x + tile_width, width)
-                x_start = max(0, x_end - tile_width)
-
-                coords.append((x_start, y_start, x_end, y_end))
-
-                if x_end >= width:
-                    break
-                x += stride_x
-
-            if y_end >= height:
-                break
-            y += stride_y
-
-        return coords
-
     @classmethod
     def execute(cls, image_list, final_width, final_height, overlap):
         w = final_width[0]
@@ -804,7 +776,7 @@ class ImageMergeTileList(IO.ComfyNode):
         device = first_tile.device
         dtype = first_tile.dtype
 
-        coords = cls.get_grid_coords(w, h, t_w, t_h, ovlp)
+        coords = SplitImageToTileList.get_grid_coords(w, h, t_w, t_h, ovlp)
 
         canvas = torch.zeros((b, h, w, c), device=device, dtype=dtype)
         weights = torch.zeros((b, h, w, 1), device=device, dtype=dtype)

comfy_extras/nodes_resolution.py

@@ -16,15 +16,15 @@ class AspectRatio(str, Enum):
     WIDESCREEN_V = "9:16 (Portrait Widescreen)"
 
 
-ASPECT_RATIOS: dict[str, tuple[int, int]] = {
-    "1:1 (Square)": (1, 1),
-    "3:2 (Photo)": (3, 2),
-    "4:3 (Standard)": (4, 3),
-    "16:9 (Widescreen)": (16, 9),
-    "21:9 (Ultrawide)": (21, 9),
-    "2:3 (Portrait Photo)": (2, 3),
-    "3:4 (Portrait Standard)": (3, 4),
-    "9:16 (Portrait Widescreen)": (9, 16),
+ASPECT_RATIOS: dict[AspectRatio, tuple[int, int]] = {
+    AspectRatio.SQUARE: (1, 1),
+    AspectRatio.PHOTO_H: (3, 2),
+    AspectRatio.STANDARD_H: (4, 3),
+    AspectRatio.WIDESCREEN_H: (16, 9),
+    AspectRatio.ULTRAWIDE_H: (21, 9),
+    AspectRatio.PHOTO_V: (2, 3),
+    AspectRatio.STANDARD_V: (3, 4),
+    AspectRatio.WIDESCREEN_V: (9, 16),
 }
 
 
@@ -55,8 +55,12 @@ class ResolutionSelector(io.ComfyNode):
                 ),
             ],
             outputs=[
-                io.Int.Output("width", tooltip="Calculated width in pixels (multiple of 8)."),
-                io.Int.Output("height", tooltip="Calculated height in pixels (multiple of 8)."),
+                io.Int.Output(
+                    "width", tooltip="Calculated width in pixels (multiple of 8)."
+                ),
+                io.Int.Output(
+                    "height", tooltip="Calculated height in pixels (multiple of 8)."
+                ),
             ],
         )
 

nodes.py

@@ -976,7 +976,7 @@ class CLIPLoader:
     @classmethod
     def INPUT_TYPES(s):
         return {"required": { "clip_name": (folder_paths.get_filename_list("text_encoders"), ),
-                              "type": (["stable_diffusion", "stable_cascade", "sd3", "stable_audio", "mochi", "ltxv", "pixart", "cosmos", "lumina2", "wan", "hidream", "chroma", "ace", "omnigen2", "qwen_image", "hunyuan_image", "flux2", "ovis"], ),
+                              "type": (["stable_diffusion", "stable_cascade", "sd3", "stable_audio", "mochi", "ltxv", "pixart", "cosmos", "lumina2", "wan", "hidream", "chroma", "ace", "omnigen2", "qwen_image", "hunyuan_image", "flux2", "ovis", "longcat_image"], ),
                               },
                 "optional": {
                               "device": (["default", "cpu"], {"advanced": True}),

requirements.txt

@@ -31,5 +31,4 @@ spandrel
 pydantic~=2.0
 pydantic-settings~=2.0
 PyOpenGL
-PyOpenGL-accelerate
 glfw

tests-unit/comfy_test/model_detection_test.py

@@ -0,0 +1,112 @@
+import torch
+
+from comfy.model_detection import detect_unet_config, model_config_from_unet_config
+import comfy.supported_models
+
+
+def _make_longcat_comfyui_sd():
+    """Minimal ComfyUI-format state dict for pre-converted LongCat-Image weights."""
+    sd = {}
+    H = 32  # Reduce hidden state dimension to reduce memory usage
+    C_IN = 16
+    C_CTX = 3584
+
+    sd["img_in.weight"] = torch.empty(H, C_IN * 4)
+    sd["img_in.bias"] = torch.empty(H)
+    sd["txt_in.weight"] = torch.empty(H, C_CTX)
+    sd["txt_in.bias"] = torch.empty(H)
+
+    sd["time_in.in_layer.weight"] = torch.empty(H, 256)
+    sd["time_in.in_layer.bias"] = torch.empty(H)
+    sd["time_in.out_layer.weight"] = torch.empty(H, H)
+    sd["time_in.out_layer.bias"] = torch.empty(H)
+
+    sd["final_layer.adaLN_modulation.1.weight"] = torch.empty(2 * H, H)
+    sd["final_layer.adaLN_modulation.1.bias"] = torch.empty(2 * H)
+    sd["final_layer.linear.weight"] = torch.empty(C_IN * 4, H)
+    sd["final_layer.linear.bias"] = torch.empty(C_IN * 4)
+
+    for i in range(19):
+        sd[f"double_blocks.{i}.img_attn.norm.key_norm.weight"] = torch.empty(128)
+        sd[f"double_blocks.{i}.img_attn.qkv.weight"] = torch.empty(3 * H, H)
+        sd[f"double_blocks.{i}.img_mod.lin.weight"] = torch.empty(H, H)
+    for i in range(38):
+        sd[f"single_blocks.{i}.modulation.lin.weight"] = torch.empty(H, H)
+
+    return sd
+
+
+def _make_flux_schnell_comfyui_sd():
+    """Minimal ComfyUI-format state dict for standard Flux Schnell."""
+    sd = {}
+    H = 32  # Reduce hidden state dimension to reduce memory usage
+    C_IN = 16
+
+    sd["img_in.weight"] = torch.empty(H, C_IN * 4)
+    sd["img_in.bias"] = torch.empty(H)
+    sd["txt_in.weight"] = torch.empty(H, 4096)
+    sd["txt_in.bias"] = torch.empty(H)
+
+    sd["double_blocks.0.img_attn.norm.key_norm.weight"] = torch.empty(128)
+    sd["double_blocks.0.img_attn.qkv.weight"] = torch.empty(3 * H, H)
+    sd["double_blocks.0.img_mod.lin.weight"] = torch.empty(H, H)
+
+    for i in range(19):
+        sd[f"double_blocks.{i}.img_attn.norm.key_norm.weight"] = torch.empty(128)
+    for i in range(38):
+        sd[f"single_blocks.{i}.modulation.lin.weight"] = torch.empty(H, H)
+
+    return sd
+
+
+class TestModelDetection:
+    """Verify that first-match model detection selects the correct model
+    based on list ordering and unet_config specificity."""
+
+    def test_longcat_before_schnell_in_models_list(self):
+        """LongCatImage must appear before FluxSchnell in the models list."""
+        models = comfy.supported_models.models
+        longcat_idx = next(i for i, m in enumerate(models) if m.__name__ == "LongCatImage")
+        schnell_idx = next(i for i, m in enumerate(models) if m.__name__ == "FluxSchnell")
+        assert longcat_idx < schnell_idx, (
+            f"LongCatImage (index {longcat_idx}) must come before "
+            f"FluxSchnell (index {schnell_idx}) in the models list"
+        )
+
+    def test_longcat_comfyui_detected_as_longcat(self):
+        sd = _make_longcat_comfyui_sd()
+        unet_config = detect_unet_config(sd, "")
+        assert unet_config is not None
+        assert unet_config["image_model"] == "flux"
+        assert unet_config["context_in_dim"] == 3584
+        assert unet_config["vec_in_dim"] is None
+        assert unet_config["guidance_embed"] is False
+        assert unet_config["txt_ids_dims"] == [1, 2]
+
+        model_config = model_config_from_unet_config(unet_config, sd)
+        assert model_config is not None
+        assert type(model_config).__name__ == "LongCatImage"
+
+    def test_longcat_comfyui_keys_pass_through_unchanged(self):
+        """Pre-converted weights should not be transformed by process_unet_state_dict."""
+        sd = _make_longcat_comfyui_sd()
+        unet_config = detect_unet_config(sd, "")
+        model_config = model_config_from_unet_config(unet_config, sd)
+
+        processed = model_config.process_unet_state_dict(dict(sd))
+        assert "img_in.weight" in processed
+        assert "txt_in.weight" in processed
+        assert "time_in.in_layer.weight" in processed
+        assert "final_layer.linear.weight" in processed
+
+    def test_flux_schnell_comfyui_detected_as_flux_schnell(self):
+        sd = _make_flux_schnell_comfyui_sd()
+        unet_config = detect_unet_config(sd, "")
+        assert unet_config is not None
+        assert unet_config["image_model"] == "flux"
+        assert unet_config["context_in_dim"] == 4096
+        assert unet_config["txt_ids_dims"] == []
+
+        model_config = model_config_from_unet_config(unet_config, sd)
+        assert model_config is not None
+        assert type(model_config).__name__ == "FluxSchnell"