When using stram responce usage meta data return "usage": { "requests": 1, "inputTokens": 0, "outputTokens": 0, "totalTokens": 0 },

API Bugs
1

when using stream response api meta data always return usage token as 0.
“lastModelResponse”: {

  "usage": {

“requests”: 1,

“inputTokens”: 0,

“outputTokens”: 0,

“totalTokens”: 0

  },

“output”: [

    {

“id”: “FAKE_ID”,

“type”: “message”,

“role”: “assistant”,

“status”: “completed”,

“content”: [ …

2

You’re actually seeing the expected behavior.

When you use streaming, the response metadata will always show:

usage: { inputTokens: 0, outputTokens: 0, totalTokens: 0 }

Why?

Because token accounting only happens after the model finishes generating.

During a stream, the model hasn’t completed the output yet, so there’s nothing to count.

If you need accurate usage numbers, you have two options:

  1. Use a non-streamed request (usage will be included normally), or

  2. Gather the streamed chunks and inspect the final aggregated response, which is the only moment where the API can compute real token usage.

So zero values here aren’t a bug, just how the streaming pipeline reports metadata.