OpenAI Chat Completions / OpenRouter: a chunk carrying usage: { prompt_tokens, completion_tokens } (OpenAI sends it as the last chunk, with choices: [], when stream_options.include_usage is set).
usage: { prompt_tokens, completion_tokens }
choices: []
stream_options.include_usage
OpenAI Chat Completions / OpenRouter: a chunk carrying
usage: { prompt_tokens, completion_tokens }(OpenAI sends it as the last chunk, withchoices: [], whenstream_options.include_usageis set).