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[inference] add support for openAI native stream token count (elastic…
…#200745) ## Summary Fix elastic#192962 Add support for native openAI token count for streaming APIs. This is done by adding the `stream_options: {"include_usage": true}` parameter when `stream: true` is being used ([doc](https://platform.openai.com/docs/api-reference/chat/create#chat-create-stream_options)), and then using the `usage` entry for the last emitted chunk. **Note**: this was done only for the `OpenAI` and `AzureAI` [providers](https://github.com/elastic/kibana/blob/83a701e837a7a84a86dcc8d359154f900f69676a/x-pack/plugins/stack_connectors/common/openai/constants.ts#L27-L31), and **not** for the `Other` provider. The reasoning is that not all openAI """compatible""" providers fully support all options, so I didn't want to risk adding a parameter that could cause some models using an openAI adapter to reject the requests. This is also the reason why I did not change the way [getTokenCountFromOpenAIStream](https://github.com/elastic/kibana/blob/8bffd618059aacc30d6190a0d143d8b0c7217faf/x-pack/plugins/actions/server/lib/get_token_count_from_openai_stream.ts#L15) function, as we want that to work for all providers. --------- Co-authored-by: Elastic Machine <[email protected]>
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