List available chat models with token pricing (USD per 1M tokens)

Example response

{
  "object": "list",
  "data": [
    {
      "id": "gemini-3.5-flash",
      "object": "model",
      "created": 1700000000,
      "owned_by": "api-stock",
      "pricing": {
        "currency": "USD",
        "unit": "1M_tokens",
        "input": 1.4,
        "output": 8.4,
        "cacheRead": 0.14,
        "cacheWrite": 5,
        "longContext": {
          "thresholdTokens": 272000,
          "input": 2.8,
          "output": 12.6,
          "cacheRead": 0.28,
          "cacheWrite": 10
        }
      }
    }
  ]
}