Is there a way to define a checkpoint with API?

[OfficialPesonen]

I want to use txt2img API endpoint with a specific checkpoint.

Is this currently possible and if not how should I implement this feature?
I've been thinking about loading all checkpoints at start.

[Kilvoctu]

You can pull checkpoints from API endpoint /sdapi/v1/sd-models

To change checkpoint, one way to do it is construct payload containing "sd_model_checkpoint": "your checkpoint", then post it to /sdapi/v1/options

[Kilvoctu]

The other way I think some people do it is include the model swap into the txt2img payload itself. So something like this, for example:

payload = {
    "prompt": "cirno",
    "steps": 20
}

override_settings = {}
override_settings["sd_model_checkpoint"] = "your checkpoint"

override_payload = {
                "override_settings": override_settings
            }
payload.update(override_payload)

Then post to /sdapi/v1/txt2img

This is a bit different in that it'll change the checkpoint for only that request (then it'll swap back). You can prevent this by also including "override_settings_restore_afterwards": false in the payload.

edit: You can also pull checkpoints straight from /config but it's more cumbersome than simply using /sdapi/v1/sd-models

[OfficialPesonen]

This is actually what I was looking for. Thanks a lot again!

[eugenecooper]

You can pull checkpoints from API endpoint /sdapi/v1/sd-models

To change checkpoint, one way to do it is construct payload containing "sd_model_checkpoint": "your checkpoint", then post it to /sdapi/v1/options

Your suggestion works great to update the config.
However, even though the config is getting updated, for some reason the backend doesn't apply the changes (doesn't change the currently loaded model and doesn't reflect the change in Web UI).
Maybe some additional API call is required in order to apply the changes?

[zhang-jie8]

Where should I set a override_settings_restore_afterwards

[subinznz]

it does on mine .

[subinznz]

for anyone that wants know how to do it by sending api request with javascript this is the body json example
{
"prompt" : "sdfsdklfjskldfjlsd",
...
...
"override_settings": {
"sd_model_checkpoint": "anyloraCheckpoint_bakedvaeBlessedFp16"
},
"override_settings_restore_afterwards": true,

}

[subinznz]

I'm not sure of the behaviour when you got 2 simultaneous requests .. as in two different users performing on a different model