Selecting a specific provider with OpenRouter

[MartinMikusat]

I might be missing something, is it possible to select a specific provider from OpenRouter? I couldn't find any info on this so I searched around, tried a bunch of random stuff but none of this seems to be using Cerebras as the provider (the speed difference should be obvious in their case, that's what I want to try)

{
 "$schema": "https://opencode.ai/config.json",
 "provider": {
 "openrouter": {
 "npm": "@openrouter/ai-sdk-provider",
 "name": "OpenRouter",
 "options": {
 "apiKey": 
 },
 "models": {
 "meta-llama/llama-4-scout:cerebras": {
 "name": "Llama 4 Scout",
 "order": [
 "cerebras"
 ],
 "provider": "cerebras"
 }
 }
 }
 }
}

[thdxr]

i wasn't able to find documentation on their ai sdk provider on how to pass this through - do you see anything?

[cravenceiling]

i wasn't able to find documentation on their ai sdk provider on how to pass this through - do you see anything?

According to this documentation from openrouter, the openrouter provider can be customized using a provider object which must be sent in the request body. Also, the ai-sdk has this documentation about passing extra body options to openrouter.