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* ComfyUI: Support for setting the model information from the prompt.

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Antonio Cordero Balcazar
2026-05-14 22:03:43 +02:00
parent 81cc81c8f9
commit 03e7e9b445
7 changed files with 167 additions and 61 deletions
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docs/CONFIG.md
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@@ -45,6 +45,8 @@ Inputs:
The options nodes are optional. If you don't need to change any of the default values then you don't need to use them.
The model/modelname are also optional, but if you don't set them you will not be capable of changing content based on that. You can however set them from the prompt.
Outputs:
* **pos_prompt**: the resulting positive prompt
docs/COOKBOOK.md
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@@ -477,6 +477,12 @@ You can also use `evaluate ifundefined` (`?=!`) to resolve the wildcard immediat
${quality?=!__qualities__}
```
## Choosing the model from the prompt
In ComfyUI, you can leave the model and modelname inputs disconnected and set the `_modelinfo` system variable (or `_modelfullname` and `_modelclass`) at the start of the prompt (maybe through a wildcard or a choice construct). Then extract the `_modelfullname` output variable using the `Select Variable` node and use its value to actually load that model.
You can also set and extract user variables for other ksampler inputs, like sampler, scheduler, steps, cfg and latent size. The numeric ones will need to be transformed from string to int/float using some other node.
## Debugging tips
When something isn't generating as expected, the debug setting is your first tool. Enable it in the extension settings; it will log all system variables at generation time, which tells you exactly what values are available for your conditions.
docs/SYNTAX.md
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@@ -195,6 +195,37 @@ The format is:
The wildcard identifier supports globbing. The filter does not allow the `^` or `#` flags.
## Variables
The prompt has access to some system variables that contain model information, options, and other things. There is also the possibility of defining user variables.
All these variables can be used to output content or behave differently based on their values.
### System variables
Names starting with an underscore are reserved for system variables:
| System variable | Value |
| --------------- | ----- |
| `_model` | the loaded model identifier (`sd1`, `sd2`, `sdxl`, `sd3`, `flux`, `auraflow`). `_sd` also works but is deprecated. |
| `_modelname` | the loaded model filename (without path). `_sdname` also works but is deprecated. |
| `_modelfullname` | the loaded model filename (with path). `_sdfullname` also works but is deprecated. In ComfyUI this variable can also be **set** to override the filename used for model detection (see below). |
| `_modelclass` | the class used for the model. Note that this is dependent on the webui. In A1111 all SD versions use the same class. Can be used for new models that are not supported yet with the `_is_*` variables. The debug setting will show all system variables when generating in case you need to see which one to use for a certain model. In ComfyUI this variable can also be **set** to override the class used for model detection (see below). |
| `_modelinfo` | Contains both class and model full name separated with `@`. In ComfyUI can be set to change both `_modelfullname` and `_modelclass` at once (see below). |
| `_is_sd` | true if the loaded model version is any version of SD |
| `_is_sd1` | true if the loaded model version is SD 1.x |
| `_is_sd2` | true if the loaded model version is SD 2.x |
| `_is_sdxl` | true if the loaded model version is SDXL (includes Pony models) |
| `_is_sd3` | true if the loaded model version is SD 3.x |
| `_is_flux` | true if the loaded model is Flux |
| `_is_auraflow` | true if the loaded model is AuraFlow |
| `_is_ssd` | true if the loaded model version is SSD (Segmind Stable Diffusion 1B). Note that for an SSD model `_is_sdxl` will also be true. |
| `_is_sdxl_no_ssd` | true if the loaded model version is SDXL and not an SSD model. |
| `_is_sdxl_no_pony` | true if the loaded model version is SDXL and not a Pony model (the `pony` variant must be defined in settings). Kept to maintain compatibility with previous versions. |
| `_is_vvvv` | true if the loaded model matches the *vvvv* model variant definition (based on its filename). Note that the corresponding variable for the model kind will also be true. |
| `_is_pure_kkkk` | true if the loaded model is of kind *kkkk* (f.e. sdxl) and not a variant. |
| `_is_variant_kkkk` | true if the loaded model version is any variant of model kind *kkkk* and not the pure version. Note that the corresponding variable for the model kind will also be true. |
## Set command
This command sets the value of a variable that can be checked later.
@@ -227,6 +258,28 @@ If also supports the addition and undefined check as an extension of the *Dynami
Set variables are included in the output variables with their last value.
System variables cannot be set, except in some cases (see next point).
### Overriding model information from the prompt (ComfyUI only)
In ComfyUI, `_modelfullname`, `_modelclass`, and `_modelinfo` can be **set** from the prompt using the `set` command or `${}` syntax. Setting any of them triggers a re-evaluation of all `_is_*` system variables, so conditions that come later in the prompt will reflect the new values.
This is useful in workflows where the model information is not passed through the standard ComfyUI model input but is known at prompt time. And the `_modelfullname` variable can be extracted later by using the Select Variable node to actually load that model.
`_modelinfo` is a shorthand that sets both `_modelfullname` and `_modelclass` in a single call. Its value must use the format `<class>@<filename>`:
```text
${_modelinfo=Flux@fluxmodel.safetensors}
```
Or individually:
```text
${_modelclass=Flux}${_modelfullname=fluxmodel.safetensors}
```
Attempting to set these variables in any other host will trigger a warning or error depending on the **What to do on invalid content warnings?** setting.
## Echo command
This command prints the value of a variable, or the specified default if it doesn't exist. If the variable does not exist and has no default, depending on the **What to do on invalid content warnings?** setting it will assume an empty value, or result in an error.
@@ -265,9 +318,9 @@ They can be initialized in several ways:
| `${var[]+=*var2[]}` | add elements from another array |
| `${var[]+=*__wildcard__}` | add elements from a wildcard |
The star operator `*` is always with inmediate evaluation.
The star operator `*` has always an inmediate evaluation.
And can be accesed/echoed with:
And they can be accesed/echoed with:
* Empty brackets mean the whole array (used when initializing or when echoing the whole array)
* An integer inside the brackets means an indexed value. A variable identifier (not an indexed array) can be used to get the integer.
@@ -326,28 +379,6 @@ This list shows what they do depending on the kind of operand (R = regular varia
When a comparison tries to compare undefined variables or the values have different types (f.e. an integer and a string), the behavior depends on the `on_warning` setting: in `warn` mode the comparison evaluates to false, and in `stop` mode an error is raised. In non strict mode a numeric string literal (with no leading zeros) will be considered an integer.
The variable can be one set with the `set` command (user variables) or you can use system variables like these (names starting with an underscore are reserved for system variables):
| System variable | Value |
| --------------- | ----- |
| `_model` | the loaded model identifier (`sd1`, `sd2`, `sdxl`, `sd3`, `flux`, `auraflow`). `_sd` also works but is deprecated. |
| `_modelname` | the loaded model filename (without path). `_sdname` also works but is deprecated. |
| `_modelfullname` | the loaded model filename (with path). `_sdfullname` also works but is deprecated. |
| `_modelclass` | the class used for the model. Note that this is dependent on the webui. In A1111 all SD versions use the same class. Can be used for new models that are not supported yet with the `_is_*` variables. The debug setting will show all system variables when generating in case you need to see which one to use for a certain model. |
| `_is_sd` | true if the loaded model version is any version of SD |
| `_is_sd1` | true if the loaded model version is SD 1.x |
| `_is_sd2` | true if the loaded model version is SD 2.x |
| `_is_sdxl` | true if the loaded model version is SDXL (includes Pony models) |
| `_is_sd3` | true if the loaded model version is SD 3.x |
| `_is_flux` | true if the loaded model is Flux |
| `_is_auraflow` | true if the loaded model is AuraFlow |
| `_is_ssd` | true if the loaded model version is SSD (Segmind Stable Diffusion 1B). Note that for an SSD model `_is_sdxl` will also be true. |
| `_is_sdxl_no_ssd` | true if the loaded model version is SDXL and not an SSD model. |
| `_is_sdxl_no_pony` | true if the loaded model version is SDXL and not a Pony model (the `pony` variant must be defined in settings). Kept to maintain compatibility with previous versions. |
| `_is_vvvv` | true if the loaded model matches the *vvvv* model variant definition (based on its filename). Note that the corresponding variable for the model kind will also be true. |
| `_is_pure_kkkk` | true if the loaded model is of kind *kkkk* (f.e. sdxl) and not a variant. |
| `_is_variant_kkkk` | true if the loaded model version is any variant of model kind *kkkk* and not the pure version. Note that the corresponding variable for the model kind will also be true. |
### Example
(multiline to be easier to read)