OpenRouter provider selection

[bogorad]

I'm using OpenRouter for pretty much everything. I want my DeepSeek-R1 to use a specific provider (SambaNova gives me 300+ tokens/sec). Here's how OR explains it:

https://openrouter.ai/docs/features/provider-routing

So I need to be able to specify an additional key provider. Is it possible?

fetch('https://openrouter.ai/api/v1/chat/completions', {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer <OPENROUTER_API_KEY>',
    'HTTP-Referer': '<YOUR_SITE_URL>', // Optional. Site URL for rankings on openrouter.ai.
    'X-Title': '<YOUR_SITE_NAME>', // Optional. Site title for rankings on openrouter.ai.
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
    'model': 'mistralai/mixtral-8x7b-instruct',
    'messages': [
      {
        'role': 'user',
        'content': 'Hello'
      }
    ],
    'provider': {
      'order': [
        'OpenAI',
        'Together'
      ]
    }
  }),
});