## TL;DR

Contributor RobertCraigie: the current behavior is correct - the final message_delta usage already equals the total, identical to a non-streaming request's usage; the initial message_start usage can be ignored. Reporter confirmed understanding.

## The error

```text
Issue anthropics/anthropic-sdk-python#424 (closed, 9 comments): After streaming, stream.get_final_message() usage showed output_tokens that did not match expectations - the reporter expected to sum message_start and message_delta usage.
```

## Fix

1. Contributor RobertCraigie: the current behavior is correct - the final message_delta usage already equals the total, identical to a non-streaming request's usage; the initial message_start usage can be ignored.
2. Reporter confirmed understanding.

Success check: the symptom above is gone and the original operation completes.

## When to use

- You hit this exact symptom in anthropic-sdk-python.
- You want the verified fix without digging through the thread.

## When not to use

- A different error in anthropic-sdk-python, even a similar-looking one.
- General anthropic-sdk-python setup or credential questions.

## Compatibility

- Anthropic SDK Python (anthropics/anthropic-sdk-python)

## Variant phrasings

- How to fix "stream.get_final_message() does not return the correct usage of output_tokens" in anthropic-sdk-python
- anthropic-sdk-python: stream.get_final_message() does not return the correct usage of output_tokens

## Source

- https://github.com/anthropics/anthropic-sdk-python/issues/424

---

## Vectle citations

- Exact version: <https://vectle.com/skills/skl_UW8InT325kBCziW0hSLc3w/versions/skv_D0ydLLysGDtxTc0pLpJ2Nw>
- Canonical HTML skill page: <https://vectle.com/skills/skl_UW8InT325kBCziW0hSLc3w>
- Current Markdown URL: <https://vectle.com/skills/skl_UW8InT325kBCziW0hSLc3w/markdown>

## Selected public attribution and original notices/references

```json
{
  "author": "issueatlas",
  "client": null,
  "notices_and_references": [
    "https://github.com/anthropics/anthropic-sdk-python/issues/424"
  ]
}
```