HTTP/1.1 200 OK content-type: text/event-stream; charset=utf-8 request-id: req_011CSHxVbcaBpQ8exampleAAAA anthropic-ratelimit-requests-remaining: 49 anthropic-ratelimit-tokens-remaining: 19999 event: message_start data: {"type":"message_start","message":{"id":"msg_thinking_x","type":"message","role":"assistant","content":[],"model":"claude-sonnet-4-5","stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":15,"output_tokens":1}}} event: ping data: {"type": "ping"} event: content_block_start data: {"type":"content_block_start","index":0,"content_block":{"type":"thinking","thinking":"","signature":""}} event: content_block_delta data: {"type":"content_block_delta","index":0,"delta":{"type":"thinking_delta","thinking":"Let me think. "}} event: content_block_delta data: {"type":"content_block_delta","index":0,"delta":{"type":"thinking_delta","thinking":"2 + 2 = 4."}} event: content_block_delta data: {"type":"content_block_delta","index":0,"delta":{"type":"signature_delta","signature":"abc123sig=="}} event: content_block_stop data: {"type":"content_block_stop","index":0} event: content_block_start data: {"type":"content_block_start","index":1,"content_block":{"type":"text","text":""}} event: content_block_delta data: {"type":"content_block_delta","index":1,"delta":{"type":"text_delta","text":"The answer is 4."}} event: content_block_stop data: {"type":"content_block_stop","index":1} event: message_delta data: {"type":"message_delta","delta":{"stop_reason":"end_turn","stop_sequence":null},"usage":{"output_tokens":20}} event: message_stop data: {"type":"message_stop"}