event: message_start
data: {"type":"message_start","message":{"id":"msg_01MessageDeltaFields00000001","type":"message","role":"assistant","content":[],"model":"claude-sonnet-4-5","stop_reason":null,"stop_sequence":null,"stop_details":null,"usage":{"input_tokens":25,"cache_creation_input_tokens":10,"cache_read_input_tokens":5,"cache_creation":{"ephemeral_5m_input_tokens":10,"ephemeral_1h_input_tokens":0},"output_tokens":1,"service_tier":"standard"}}}

event: content_block_start
data: {"type":"content_block_start","index":0,"content_block":{"type":"text","text":""}}

event: content_block_delta
data: {"type":"content_block_delta","index":0,"delta":{"type":"text_delta","text":"Hello there!"}}

event: content_block_stop
data: {"type":"content_block_stop","index":0}

event: message_delta
data: {"type":"message_delta","delta":{"stop_reason":"end_turn","stop_sequence":null,"stop_details":null,"container":{"id":"container_01AbCdEfGh","expires_at":"2025-01-01T00:00:00Z"}},"usage":{"input_tokens":40,"cache_creation_input_tokens":12,"cache_read_input_tokens":7,"output_tokens":8,"output_tokens_details":{"thinking_tokens":3},"server_tool_use":{"web_search_requests":1,"web_fetch_requests":0}}}

event: message_stop
data: {"type":"message_stop"}
