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data: {"id":"chatcmpl-test2","object":"chat.completion.chunk","created":1766309809,"model":"gpt-5-nano","choices":[{"index":0,"delta":{"content":"test-uuid-12345-67890"},"finish_reason":null}]}

data: {"id":"chatcmpl-test2","object":"chat.completion.chunk","created":1766309809,"model":"gpt-5-nano","choices":[{"index":0,"delta":{},"finish_reason":"stop"}]}

data: {"id":"chatcmpl-test2","object":"chat.completion.chunk","created":1766309809,"model":"gpt-5-nano","choices":[],"usage":{"prompt_tokens":200,"completion_tokens":10,"total_tokens":210}}

data: [DONE]
